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linux/drivers/gpu/drm/i915/intel_dp.c
Ville Syrjälä 7a7f84ccb8 drm/i915: Ignore long hpds on eDP ports 
Turning vdd on/off can generate a long hpd pulse on eDP ports. In order
to handle hpd we would need to turn on vdd to perform aux transfers.
This would lead to an endless cycle of
"vdd off -> long hpd -> vdd on -> detect -> vdd off -> ..."

So ignore long hpd pulses on eDP ports. eDP panels should be physically
tied to the machine anyway so they should not actually disappear and
thus don't need long hpd handling. Short hpds are still needed for link
re-train and whatnot so we can't just turn off the hpd interrupt
entirely for eDP ports. Perhaps we could turn it off whenever the panel
is disabled, but just ignoring the long hpd seems sufficient.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Todd Previte <tprevite@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2014-10-27 13:37:13 +02:00

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/*
* Copyright © 2008 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Keith Packard <keithp@keithp.com>
*
*/
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include "intel_drv.h"
#include <drm/i915_drm.h>
#include "i915_drv.h"
#define DP_LINK_CHECK_TIMEOUT (10 * 1000)
struct dp_link_dpll {
int link_bw;
struct dpll dpll;
};
static const struct dp_link_dpll gen4_dpll[] = {
{ DP_LINK_BW_1_62,
{ .p1 = 2, .p2 = 10, .n = 2, .m1 = 23, .m2 = 8 } },
{ DP_LINK_BW_2_7,
{ .p1 = 1, .p2 = 10, .n = 1, .m1 = 14, .m2 = 2 } }
};
static const struct dp_link_dpll pch_dpll[] = {
{ DP_LINK_BW_1_62,
{ .p1 = 2, .p2 = 10, .n = 1, .m1 = 12, .m2 = 9 } },
{ DP_LINK_BW_2_7,
{ .p1 = 1, .p2 = 10, .n = 2, .m1 = 14, .m2 = 8 } }
};
static const struct dp_link_dpll vlv_dpll[] = {
{ DP_LINK_BW_1_62,
{ .p1 = 3, .p2 = 2, .n = 5, .m1 = 3, .m2 = 81 } },
{ DP_LINK_BW_2_7,
{ .p1 = 2, .p2 = 2, .n = 1, .m1 = 2, .m2 = 27 } }
};
/*
* CHV supports eDP 1.4 that have more link rates.
* Below only provides the fixed rate but exclude variable rate.
*/
static const struct dp_link_dpll chv_dpll[] = {
/*
* CHV requires to program fractional division for m2.
* m2 is stored in fixed point format using formula below
* (m2_int << 22) | m2_fraction
*/
{ DP_LINK_BW_1_62, /* m2_int = 32, m2_fraction = 1677722 */
{ .p1 = 4, .p2 = 2, .n = 1, .m1 = 2, .m2 = 0x819999a } },
{ DP_LINK_BW_2_7, /* m2_int = 27, m2_fraction = 0 */
{ .p1 = 4, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } },
{ DP_LINK_BW_5_4, /* m2_int = 27, m2_fraction = 0 */
{ .p1 = 2, .p2 = 1, .n = 1, .m1 = 2, .m2 = 0x6c00000 } }
};
/**
* is_edp - is the given port attached to an eDP panel (either CPU or PCH)
* @intel_dp: DP struct
*
* If a CPU or PCH DP output is attached to an eDP panel, this function
* will return true, and false otherwise.
*/
static bool is_edp(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
return intel_dig_port->base.type == INTEL_OUTPUT_EDP;
}
static struct drm_device *intel_dp_to_dev(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
return intel_dig_port->base.base.dev;
}
static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
{
return enc_to_intel_dp(&intel_attached_encoder(connector)->base);
}
static void intel_dp_link_down(struct intel_dp *intel_dp);
static bool edp_panel_vdd_on(struct intel_dp *intel_dp);
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
int
intel_dp_max_link_bw(struct intel_dp *intel_dp)
{
int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
struct drm_device *dev = intel_dp->attached_connector->base.dev;
switch (max_link_bw) {
case DP_LINK_BW_1_62:
case DP_LINK_BW_2_7:
break;
case DP_LINK_BW_5_4: /* 1.2 capable displays may advertise higher bw */
if (((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) ||
INTEL_INFO(dev)->gen >= 8) &&
intel_dp->dpcd[DP_DPCD_REV] >= 0x12)
max_link_bw = DP_LINK_BW_5_4;
else
max_link_bw = DP_LINK_BW_2_7;
break;
default:
WARN(1, "invalid max DP link bw val %x, using 1.62Gbps\n",
max_link_bw);
max_link_bw = DP_LINK_BW_1_62;
break;
}
return max_link_bw;
}
static u8 intel_dp_max_lane_count(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
u8 source_max, sink_max;
source_max = 4;
if (HAS_DDI(dev) && intel_dig_port->port == PORT_A &&
(intel_dig_port->saved_port_bits & DDI_A_4_LANES) == 0)
source_max = 2;
sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
return min(source_max, sink_max);
}
/*
* The units on the numbers in the next two are... bizarre. Examples will
* make it clearer; this one parallels an example in the eDP spec.
*
* intel_dp_max_data_rate for one lane of 2.7GHz evaluates as:
*
* 270000 * 1 * 8 / 10 == 216000
*
* The actual data capacity of that configuration is 2.16Gbit/s, so the
* units are decakilobits. ->clock in a drm_display_mode is in kilohertz -
* or equivalently, kilopixels per second - so for 1680x1050R it'd be
* 119000. At 18bpp that's 2142000 kilobits per second.
*
* Thus the strange-looking division by 10 in intel_dp_link_required, to
* get the result in decakilobits instead of kilobits.
*/
static int
intel_dp_link_required(int pixel_clock, int bpp)
{
return (pixel_clock * bpp + 9) / 10;
}
static int
intel_dp_max_data_rate(int max_link_clock, int max_lanes)
{
return (max_link_clock * max_lanes * 8) / 10;
}
static enum drm_mode_status
intel_dp_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
int target_clock = mode->clock;
int max_rate, mode_rate, max_lanes, max_link_clock;
if (is_edp(intel_dp) && fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
target_clock = fixed_mode->clock;
}
max_link_clock = drm_dp_bw_code_to_link_rate(intel_dp_max_link_bw(intel_dp));
max_lanes = intel_dp_max_lane_count(intel_dp);
max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
mode_rate = intel_dp_link_required(target_clock, 18);
if (mode_rate > max_rate)
return MODE_CLOCK_HIGH;
if (mode->clock < 10000)
return MODE_CLOCK_LOW;
if (mode->flags & DRM_MODE_FLAG_DBLCLK)
return MODE_H_ILLEGAL;
return MODE_OK;
}
static uint32_t
pack_aux(uint8_t *src, int src_bytes)
{
int i;
uint32_t v = 0;
if (src_bytes > 4)
src_bytes = 4;
for (i = 0; i < src_bytes; i++)
v |= ((uint32_t) src[i]) << ((3-i) * 8);
return v;
}
static void
unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
{
int i;
if (dst_bytes > 4)
dst_bytes = 4;
for (i = 0; i < dst_bytes; i++)
dst[i] = src >> ((3-i) * 8);
}
/* hrawclock is 1/4 the FSB frequency */
static int
intel_hrawclk(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t clkcfg;
/* There is no CLKCFG reg in Valleyview. VLV hrawclk is 200 MHz */
if (IS_VALLEYVIEW(dev))
return 200;
clkcfg = I915_READ(CLKCFG);
switch (clkcfg & CLKCFG_FSB_MASK) {
case CLKCFG_FSB_400:
return 100;
case CLKCFG_FSB_533:
return 133;
case CLKCFG_FSB_667:
return 166;
case CLKCFG_FSB_800:
return 200;
case CLKCFG_FSB_1067:
return 266;
case CLKCFG_FSB_1333:
return 333;
/* these two are just a guess; one of them might be right */
case CLKCFG_FSB_1600:
case CLKCFG_FSB_1600_ALT:
return 400;
default:
return 133;
}
}
static void
intel_dp_init_panel_power_sequencer(struct drm_device *dev,
struct intel_dp *intel_dp,
struct edp_power_seq *out);
static void
intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
struct intel_dp *intel_dp,
struct edp_power_seq *out);
static void pps_lock(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &intel_dig_port->base;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
/*
* See vlv_power_sequencer_reset() why we need
* a power domain reference here.
*/
power_domain = intel_display_port_power_domain(encoder);
intel_display_power_get(dev_priv, power_domain);
mutex_lock(&dev_priv->pps_mutex);
}
static void pps_unlock(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &intel_dig_port->base;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
mutex_unlock(&dev_priv->pps_mutex);
power_domain = intel_display_port_power_domain(encoder);
intel_display_power_put(dev_priv, power_domain);
}
static enum pipe
vlv_power_sequencer_pipe(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_encoder *encoder;
unsigned int pipes = (1 << PIPE_A) | (1 << PIPE_B);
struct edp_power_seq power_seq;
lockdep_assert_held(&dev_priv->pps_mutex);
if (intel_dp->pps_pipe != INVALID_PIPE)
return intel_dp->pps_pipe;
/*
* We don't have power sequencer currently.
* Pick one that's not used by other ports.
*/
list_for_each_entry(encoder, &dev->mode_config.encoder_list,
base.head) {
struct intel_dp *tmp;
if (encoder->type != INTEL_OUTPUT_EDP)
continue;
tmp = enc_to_intel_dp(&encoder->base);
if (tmp->pps_pipe != INVALID_PIPE)
pipes &= ~(1 << tmp->pps_pipe);
}
/*
* Didn't find one. This should not happen since there
* are two power sequencers and up to two eDP ports.
*/
if (WARN_ON(pipes == 0))
return PIPE_A;
intel_dp->pps_pipe = ffs(pipes) - 1;
DRM_DEBUG_KMS("picked pipe %c power sequencer for port %c\n",
pipe_name(intel_dp->pps_pipe),
port_name(intel_dig_port->port));
/* init power sequencer on this pipe and port */
intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
&power_seq);
return intel_dp->pps_pipe;
}
typedef bool (*vlv_pipe_check)(struct drm_i915_private *dev_priv,
enum pipe pipe);
static bool vlv_pipe_has_pp_on(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return I915_READ(VLV_PIPE_PP_STATUS(pipe)) & PP_ON;
}
static bool vlv_pipe_has_vdd_on(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return I915_READ(VLV_PIPE_PP_CONTROL(pipe)) & EDP_FORCE_VDD;
}
static bool vlv_pipe_any(struct drm_i915_private *dev_priv,
enum pipe pipe)
{
return true;
}
static enum pipe
vlv_initial_pps_pipe(struct drm_i915_private *dev_priv,
enum port port,
vlv_pipe_check pipe_check)
{
enum pipe pipe;
for (pipe = PIPE_A; pipe <= PIPE_B; pipe++) {
u32 port_sel = I915_READ(VLV_PIPE_PP_ON_DELAYS(pipe)) &
PANEL_PORT_SELECT_MASK;
if (port_sel != PANEL_PORT_SELECT_VLV(port))
continue;
if (!pipe_check(dev_priv, pipe))
continue;
return pipe;
}
return INVALID_PIPE;
}
static void
vlv_initial_power_sequencer_setup(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct edp_power_seq power_seq;
enum port port = intel_dig_port->port;
lockdep_assert_held(&dev_priv->pps_mutex);
/* try to find a pipe with this port selected */
/* first pick one where the panel is on */
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_has_pp_on);
/* didn't find one? pick one where vdd is on */
if (intel_dp->pps_pipe == INVALID_PIPE)
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_has_vdd_on);
/* didn't find one? pick one with just the correct port */
if (intel_dp->pps_pipe == INVALID_PIPE)
intel_dp->pps_pipe = vlv_initial_pps_pipe(dev_priv, port,
vlv_pipe_any);
/* didn't find one? just let vlv_power_sequencer_pipe() pick one when needed */
if (intel_dp->pps_pipe == INVALID_PIPE) {
DRM_DEBUG_KMS("no initial power sequencer for port %c\n",
port_name(port));
return;
}
DRM_DEBUG_KMS("initial power sequencer for port %c: pipe %c\n",
port_name(port), pipe_name(intel_dp->pps_pipe));
intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
&power_seq);
}
void vlv_power_sequencer_reset(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct intel_encoder *encoder;
if (WARN_ON(!IS_VALLEYVIEW(dev)))
return;
/*
* We can't grab pps_mutex here due to deadlock with power_domain
* mutex when power_domain functions are called while holding pps_mutex.
* That also means that in order to use pps_pipe the code needs to
* hold both a power domain reference and pps_mutex, and the power domain
* reference get/put must be done while _not_ holding pps_mutex.
* pps_{lock,unlock}() do these steps in the correct order, so one
* should use them always.
*/
list_for_each_entry(encoder, &dev->mode_config.encoder_list, base.head) {
struct intel_dp *intel_dp;
if (encoder->type != INTEL_OUTPUT_EDP)
continue;
intel_dp = enc_to_intel_dp(&encoder->base);
intel_dp->pps_pipe = INVALID_PIPE;
}
}
static u32 _pp_ctrl_reg(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
if (HAS_PCH_SPLIT(dev))
return PCH_PP_CONTROL;
else
return VLV_PIPE_PP_CONTROL(vlv_power_sequencer_pipe(intel_dp));
}
static u32 _pp_stat_reg(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
if (HAS_PCH_SPLIT(dev))
return PCH_PP_STATUS;
else
return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));
}
/* Reboot notifier handler to shutdown panel power to guarantee T12 timing
This function only applicable when panel PM state is not to be tracked */
static int edp_notify_handler(struct notifier_block *this, unsigned long code,
void *unused)
{
struct intel_dp *intel_dp = container_of(this, typeof(* intel_dp),
edp_notifier);
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp_div;
u32 pp_ctrl_reg, pp_div_reg;
if (!is_edp(intel_dp) || code != SYS_RESTART)
return 0;
pps_lock(intel_dp);
if (IS_VALLEYVIEW(dev)) {
enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe);
pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
pp_div = I915_READ(pp_div_reg);
pp_div &= PP_REFERENCE_DIVIDER_MASK;
/* 0x1F write to PP_DIV_REG sets max cycle delay */
I915_WRITE(pp_div_reg, pp_div | 0x1F);
I915_WRITE(pp_ctrl_reg, PANEL_UNLOCK_REGS | PANEL_POWER_OFF);
msleep(intel_dp->panel_power_cycle_delay);
}
pps_unlock(intel_dp);
return 0;
}
static bool edp_have_panel_power(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
lockdep_assert_held(&dev_priv->pps_mutex);
return (I915_READ(_pp_stat_reg(intel_dp)) & PP_ON) != 0;
}
static bool edp_have_panel_vdd(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
lockdep_assert_held(&dev_priv->pps_mutex);
return I915_READ(_pp_ctrl_reg(intel_dp)) & EDP_FORCE_VDD;
}
static void
intel_dp_check_edp(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
if (!is_edp(intel_dp))
return;
if (!edp_have_panel_power(intel_dp) && !edp_have_panel_vdd(intel_dp)) {
WARN(1, "eDP powered off while attempting aux channel communication.\n");
DRM_DEBUG_KMS("Status 0x%08x Control 0x%08x\n",
I915_READ(_pp_stat_reg(intel_dp)),
I915_READ(_pp_ctrl_reg(intel_dp)));
}
}
static uint32_t
intel_dp_aux_wait_done(struct intel_dp *intel_dp, bool has_aux_irq)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
uint32_t status;
bool done;
#define C (((status = I915_READ_NOTRACE(ch_ctl)) & DP_AUX_CH_CTL_SEND_BUSY) == 0)
if (has_aux_irq)
done = wait_event_timeout(dev_priv->gmbus_wait_queue, C,
msecs_to_jiffies_timeout(10));
else
done = wait_for_atomic(C, 10) == 0;
if (!done)
DRM_ERROR("dp aux hw did not signal timeout (has irq: %i)!\n",
has_aux_irq);
#undef C
return status;
}
static uint32_t i9xx_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
/*
* The clock divider is based off the hrawclk, and would like to run at
* 2MHz. So, take the hrawclk value and divide by 2 and use that
*/
return index ? 0 : intel_hrawclk(dev) / 2;
}
static uint32_t ilk_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
if (index)
return 0;
if (intel_dig_port->port == PORT_A) {
if (IS_GEN6(dev) || IS_GEN7(dev))
return 200; /* SNB & IVB eDP input clock at 400Mhz */
else
return 225; /* eDP input clock at 450Mhz */
} else {
return DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
}
}
static uint32_t hsw_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (intel_dig_port->port == PORT_A) {
if (index)
return 0;
return DIV_ROUND_CLOSEST(intel_ddi_get_cdclk_freq(dev_priv), 2000);
} else if (dev_priv->pch_id == INTEL_PCH_LPT_DEVICE_ID_TYPE) {
/* Workaround for non-ULT HSW */
switch (index) {
case 0: return 63;
case 1: return 72;
default: return 0;
}
} else {
return index ? 0 : DIV_ROUND_UP(intel_pch_rawclk(dev), 2);
}
}
static uint32_t vlv_get_aux_clock_divider(struct intel_dp *intel_dp, int index)
{
return index ? 0 : 100;
}
static uint32_t i9xx_get_aux_send_ctl(struct intel_dp *intel_dp,
bool has_aux_irq,
int send_bytes,
uint32_t aux_clock_divider)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
uint32_t precharge, timeout;
if (IS_GEN6(dev))
precharge = 3;
else
precharge = 5;
if (IS_BROADWELL(dev) && intel_dp->aux_ch_ctl_reg == DPA_AUX_CH_CTL)
timeout = DP_AUX_CH_CTL_TIME_OUT_600us;
else
timeout = DP_AUX_CH_CTL_TIME_OUT_400us;
return DP_AUX_CH_CTL_SEND_BUSY |
DP_AUX_CH_CTL_DONE |
(has_aux_irq ? DP_AUX_CH_CTL_INTERRUPT : 0) |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
timeout |
DP_AUX_CH_CTL_RECEIVE_ERROR |
(send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT);
}
static int
intel_dp_aux_ch(struct intel_dp *intel_dp,
uint8_t *send, int send_bytes,
uint8_t *recv, int recv_size)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t ch_ctl = intel_dp->aux_ch_ctl_reg;
uint32_t ch_data = ch_ctl + 4;
uint32_t aux_clock_divider;
int i, ret, recv_bytes;
uint32_t status;
int try, clock = 0;
bool has_aux_irq = HAS_AUX_IRQ(dev);
bool vdd;
pps_lock(intel_dp);
/*
* We will be called with VDD already enabled for dpcd/edid/oui reads.
* In such cases we want to leave VDD enabled and it's up to upper layers
* to turn it off. But for eg. i2c-dev access we need to turn it on/off
* ourselves.
*/
vdd = edp_panel_vdd_on(intel_dp);
/* dp aux is extremely sensitive to irq latency, hence request the
* lowest possible wakeup latency and so prevent the cpu from going into
* deep sleep states.
*/
pm_qos_update_request(&dev_priv->pm_qos, 0);
intel_dp_check_edp(intel_dp);
intel_aux_display_runtime_get(dev_priv);
/* Try to wait for any previous AUX channel activity */
for (try = 0; try < 3; try++) {
status = I915_READ_NOTRACE(ch_ctl);
if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
break;
msleep(1);
}
if (try == 3) {
WARN(1, "dp_aux_ch not started status 0x%08x\n",
I915_READ(ch_ctl));
ret = -EBUSY;
goto out;
}
/* Only 5 data registers! */
if (WARN_ON(send_bytes > 20 || recv_size > 20)) {
ret = -E2BIG;
goto out;
}
while ((aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, clock++))) {
u32 send_ctl = intel_dp->get_aux_send_ctl(intel_dp,
has_aux_irq,
send_bytes,
aux_clock_divider);
/* Must try at least 3 times according to DP spec */
for (try = 0; try < 5; try++) {
/* Load the send data into the aux channel data registers */
for (i = 0; i < send_bytes; i += 4)
I915_WRITE(ch_data + i,
pack_aux(send + i, send_bytes - i));
/* Send the command and wait for it to complete */
I915_WRITE(ch_ctl, send_ctl);
status = intel_dp_aux_wait_done(intel_dp, has_aux_irq);
/* Clear done status and any errors */
I915_WRITE(ch_ctl,
status |
DP_AUX_CH_CTL_DONE |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
DP_AUX_CH_CTL_RECEIVE_ERROR);
if (status & (DP_AUX_CH_CTL_TIME_OUT_ERROR |
DP_AUX_CH_CTL_RECEIVE_ERROR))
continue;
if (status & DP_AUX_CH_CTL_DONE)
break;
}
if (status & DP_AUX_CH_CTL_DONE)
break;
}
if ((status & DP_AUX_CH_CTL_DONE) == 0) {
DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
ret = -EBUSY;
goto out;
}
/* Check for timeout or receive error.
* Timeouts occur when the sink is not connected
*/
if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
ret = -EIO;
goto out;
}
/* Timeouts occur when the device isn't connected, so they're
* "normal" -- don't fill the kernel log with these */
if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
ret = -ETIMEDOUT;
goto out;
}
/* Unload any bytes sent back from the other side */
recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
if (recv_bytes > recv_size)
recv_bytes = recv_size;
for (i = 0; i < recv_bytes; i += 4)
unpack_aux(I915_READ(ch_data + i),
recv + i, recv_bytes - i);
ret = recv_bytes;
out:
pm_qos_update_request(&dev_priv->pm_qos, PM_QOS_DEFAULT_VALUE);
intel_aux_display_runtime_put(dev_priv);
if (vdd)
edp_panel_vdd_off(intel_dp, false);
pps_unlock(intel_dp);
return ret;
}
#define BARE_ADDRESS_SIZE 3
#define HEADER_SIZE (BARE_ADDRESS_SIZE + 1)
static ssize_t
intel_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
{
struct intel_dp *intel_dp = container_of(aux, struct intel_dp, aux);
uint8_t txbuf[20], rxbuf[20];
size_t txsize, rxsize;
int ret;
txbuf[0] = msg->request << 4;
txbuf[1] = msg->address >> 8;
txbuf[2] = msg->address & 0xff;
txbuf[3] = msg->size - 1;
switch (msg->request & ~DP_AUX_I2C_MOT) {
case DP_AUX_NATIVE_WRITE:
case DP_AUX_I2C_WRITE:
txsize = msg->size ? HEADER_SIZE + msg->size : BARE_ADDRESS_SIZE;
rxsize = 1;
if (WARN_ON(txsize > 20))
return -E2BIG;
memcpy(txbuf + HEADER_SIZE, msg->buffer, msg->size);
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
/* Return payload size. */
ret = msg->size;
}
break;
case DP_AUX_NATIVE_READ:
case DP_AUX_I2C_READ:
txsize = msg->size ? HEADER_SIZE : BARE_ADDRESS_SIZE;
rxsize = msg->size + 1;
if (WARN_ON(rxsize > 20))
return -E2BIG;
ret = intel_dp_aux_ch(intel_dp, txbuf, txsize, rxbuf, rxsize);
if (ret > 0) {
msg->reply = rxbuf[0] >> 4;
/*
* Assume happy day, and copy the data. The caller is
* expected to check msg->reply before touching it.
*
* Return payload size.
*/
ret--;
memcpy(msg->buffer, rxbuf + 1, ret);
}
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static void
intel_dp_aux_init(struct intel_dp *intel_dp, struct intel_connector *connector)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum port port = intel_dig_port->port;
const char *name = NULL;
int ret;
switch (port) {
case PORT_A:
intel_dp->aux_ch_ctl_reg = DPA_AUX_CH_CTL;
name = "DPDDC-A";
break;
case PORT_B:
intel_dp->aux_ch_ctl_reg = PCH_DPB_AUX_CH_CTL;
name = "DPDDC-B";
break;
case PORT_C:
intel_dp->aux_ch_ctl_reg = PCH_DPC_AUX_CH_CTL;
name = "DPDDC-C";
break;
case PORT_D:
intel_dp->aux_ch_ctl_reg = PCH_DPD_AUX_CH_CTL;
name = "DPDDC-D";
break;
default:
BUG();
}
if (!HAS_DDI(dev))
intel_dp->aux_ch_ctl_reg = intel_dp->output_reg + 0x10;
intel_dp->aux.name = name;
intel_dp->aux.dev = dev->dev;
intel_dp->aux.transfer = intel_dp_aux_transfer;
DRM_DEBUG_KMS("registering %s bus for %s\n", name,
connector->base.kdev->kobj.name);
ret = drm_dp_aux_register(&intel_dp->aux);
if (ret < 0) {
DRM_ERROR("drm_dp_aux_register() for %s failed (%d)\n",
name, ret);
return;
}
ret = sysfs_create_link(&connector->base.kdev->kobj,
&intel_dp->aux.ddc.dev.kobj,
intel_dp->aux.ddc.dev.kobj.name);
if (ret < 0) {
DRM_ERROR("sysfs_create_link() for %s failed (%d)\n", name, ret);
drm_dp_aux_unregister(&intel_dp->aux);
}
}
static void
intel_dp_connector_unregister(struct intel_connector *intel_connector)
{
struct intel_dp *intel_dp = intel_attached_dp(&intel_connector->base);
if (!intel_connector->mst_port)
sysfs_remove_link(&intel_connector->base.kdev->kobj,
intel_dp->aux.ddc.dev.kobj.name);
intel_connector_unregister(intel_connector);
}
static void
hsw_dp_set_ddi_pll_sel(struct intel_crtc_config *pipe_config, int link_bw)
{
switch (link_bw) {
case DP_LINK_BW_1_62:
pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_810;
break;
case DP_LINK_BW_2_7:
pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_1350;
break;
case DP_LINK_BW_5_4:
pipe_config->ddi_pll_sel = PORT_CLK_SEL_LCPLL_2700;
break;
}
}
static void
intel_dp_set_clock(struct intel_encoder *encoder,
struct intel_crtc_config *pipe_config, int link_bw)
{
struct drm_device *dev = encoder->base.dev;
const struct dp_link_dpll *divisor = NULL;
int i, count = 0;
if (IS_G4X(dev)) {
divisor = gen4_dpll;
count = ARRAY_SIZE(gen4_dpll);
} else if (HAS_PCH_SPLIT(dev)) {
divisor = pch_dpll;
count = ARRAY_SIZE(pch_dpll);
} else if (IS_CHERRYVIEW(dev)) {
divisor = chv_dpll;
count = ARRAY_SIZE(chv_dpll);
} else if (IS_VALLEYVIEW(dev)) {
divisor = vlv_dpll;
count = ARRAY_SIZE(vlv_dpll);
}
if (divisor && count) {
for (i = 0; i < count; i++) {
if (link_bw == divisor[i].link_bw) {
pipe_config->dpll = divisor[i].dpll;
pipe_config->clock_set = true;
break;
}
}
}
}
bool
intel_dp_compute_config(struct intel_encoder *encoder,
struct intel_crtc_config *pipe_config)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = dp_to_dig_port(intel_dp)->port;
struct intel_crtc *intel_crtc = encoder->new_crtc;
struct intel_connector *intel_connector = intel_dp->attached_connector;
int lane_count, clock;
int min_lane_count = 1;
int max_lane_count = intel_dp_max_lane_count(intel_dp);
/* Conveniently, the link BW constants become indices with a shift...*/
int min_clock = 0;
int max_clock = intel_dp_max_link_bw(intel_dp) >> 3;
int bpp, mode_rate;
static int bws[] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7, DP_LINK_BW_5_4 };
int link_avail, link_clock;
if (HAS_PCH_SPLIT(dev) && !HAS_DDI(dev) && port != PORT_A)
pipe_config->has_pch_encoder = true;
pipe_config->has_dp_encoder = true;
pipe_config->has_drrs = false;
pipe_config->has_audio = intel_dp->has_audio;
if (is_edp(intel_dp) && intel_connector->panel.fixed_mode) {
intel_fixed_panel_mode(intel_connector->panel.fixed_mode,
adjusted_mode);
if (!HAS_PCH_SPLIT(dev))
intel_gmch_panel_fitting(intel_crtc, pipe_config,
intel_connector->panel.fitting_mode);
else
intel_pch_panel_fitting(intel_crtc, pipe_config,
intel_connector->panel.fitting_mode);
}
if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK)
return false;
DRM_DEBUG_KMS("DP link computation with max lane count %i "
"max bw %02x pixel clock %iKHz\n",
max_lane_count, bws[max_clock],
adjusted_mode->crtc_clock);
/* Walk through all bpp values. Luckily they're all nicely spaced with 2
* bpc in between. */
bpp = pipe_config->pipe_bpp;
if (is_edp(intel_dp)) {
if (dev_priv->vbt.edp_bpp && dev_priv->vbt.edp_bpp < bpp) {
DRM_DEBUG_KMS("clamping bpp for eDP panel to BIOS-provided %i\n",
dev_priv->vbt.edp_bpp);
bpp = dev_priv->vbt.edp_bpp;
}
/*
* Use the maximum clock and number of lanes the eDP panel
* advertizes being capable of. The panels are generally
* designed to support only a single clock and lane
* configuration, and typically these values correspond to the
* native resolution of the panel.
*/
min_lane_count = max_lane_count;
min_clock = max_clock;
}
for (; bpp >= 6*3; bpp -= 2*3) {
mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
bpp);
for (clock = min_clock; clock <= max_clock; clock++) {
for (lane_count = min_lane_count; lane_count <= max_lane_count; lane_count <<= 1) {
link_clock = drm_dp_bw_code_to_link_rate(bws[clock]);
link_avail = intel_dp_max_data_rate(link_clock,
lane_count);
if (mode_rate <= link_avail) {
goto found;
}
}
}
}
return false;
found:
if (intel_dp->color_range_auto) {
/*
* See:
* CEA-861-E - 5.1 Default Encoding Parameters
* VESA DisplayPort Ver.1.2a - 5.1.1.1 Video Colorimetry
*/
if (bpp != 18 && drm_match_cea_mode(adjusted_mode) > 1)
intel_dp->color_range = DP_COLOR_RANGE_16_235;
else
intel_dp->color_range = 0;
}
if (intel_dp->color_range)
pipe_config->limited_color_range = true;
intel_dp->link_bw = bws[clock];
intel_dp->lane_count = lane_count;
pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
DRM_DEBUG_KMS("DP link bw %02x lane count %d clock %d bpp %d\n",
intel_dp->link_bw, intel_dp->lane_count,
pipe_config->port_clock, bpp);
DRM_DEBUG_KMS("DP link bw required %i available %i\n",
mode_rate, link_avail);
intel_link_compute_m_n(bpp, lane_count,
adjusted_mode->crtc_clock,
pipe_config->port_clock,
&pipe_config->dp_m_n);
if (intel_connector->panel.downclock_mode != NULL &&
intel_dp->drrs_state.type == SEAMLESS_DRRS_SUPPORT) {
pipe_config->has_drrs = true;
intel_link_compute_m_n(bpp, lane_count,
intel_connector->panel.downclock_mode->clock,
pipe_config->port_clock,
&pipe_config->dp_m2_n2);
}
if (IS_HASWELL(dev) || IS_BROADWELL(dev))
hsw_dp_set_ddi_pll_sel(pipe_config, intel_dp->link_bw);
else
intel_dp_set_clock(encoder, pipe_config, intel_dp->link_bw);
return true;
}
static void ironlake_set_pll_cpu_edp(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
struct drm_device *dev = crtc->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpa_ctl;
DRM_DEBUG_KMS("eDP PLL enable for clock %d\n", crtc->config.port_clock);
dpa_ctl = I915_READ(DP_A);
dpa_ctl &= ~DP_PLL_FREQ_MASK;
if (crtc->config.port_clock == 162000) {
/* For a long time we've carried around a ILK-DevA w/a for the
* 160MHz clock. If we're really unlucky, it's still required.
*/
DRM_DEBUG_KMS("160MHz cpu eDP clock, might need ilk devA w/a\n");
dpa_ctl |= DP_PLL_FREQ_160MHZ;
intel_dp->DP |= DP_PLL_FREQ_160MHZ;
} else {
dpa_ctl |= DP_PLL_FREQ_270MHZ;
intel_dp->DP |= DP_PLL_FREQ_270MHZ;
}
I915_WRITE(DP_A, dpa_ctl);
POSTING_READ(DP_A);
udelay(500);
}
static void intel_dp_prepare(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = dp_to_dig_port(intel_dp)->port;
struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
/*
* There are four kinds of DP registers:
*
* IBX PCH
* SNB CPU
* IVB CPU
* CPT PCH
*
* IBX PCH and CPU are the same for almost everything,
* except that the CPU DP PLL is configured in this
* register
*
* CPT PCH is quite different, having many bits moved
* to the TRANS_DP_CTL register instead. That
* configuration happens (oddly) in ironlake_pch_enable
*/
/* Preserve the BIOS-computed detected bit. This is
* supposed to be read-only.
*/
intel_dp->DP = I915_READ(intel_dp->output_reg) & DP_DETECTED;
/* Handle DP bits in common between all three register formats */
intel_dp->DP |= DP_VOLTAGE_0_4 | DP_PRE_EMPHASIS_0;
intel_dp->DP |= DP_PORT_WIDTH(intel_dp->lane_count);
if (crtc->config.has_audio) {
DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
pipe_name(crtc->pipe));
intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
intel_write_eld(&encoder->base, adjusted_mode);
}
/* Split out the IBX/CPU vs CPT settings */
if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) {
if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
intel_dp->DP |= DP_SYNC_HS_HIGH;
if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
intel_dp->DP |= DP_SYNC_VS_HIGH;
intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
intel_dp->DP |= DP_ENHANCED_FRAMING;
intel_dp->DP |= crtc->pipe << 29;
} else if (!HAS_PCH_CPT(dev) || port == PORT_A) {
if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev))
intel_dp->DP |= intel_dp->color_range;
if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
intel_dp->DP |= DP_SYNC_HS_HIGH;
if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
intel_dp->DP |= DP_SYNC_VS_HIGH;
intel_dp->DP |= DP_LINK_TRAIN_OFF;
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
intel_dp->DP |= DP_ENHANCED_FRAMING;
if (!IS_CHERRYVIEW(dev)) {
if (crtc->pipe == 1)
intel_dp->DP |= DP_PIPEB_SELECT;
} else {
intel_dp->DP |= DP_PIPE_SELECT_CHV(crtc->pipe);
}
} else {
intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
}
}
#define IDLE_ON_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | PP_SEQUENCE_STATE_MASK)
#define IDLE_ON_VALUE (PP_ON | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_ON_IDLE)
#define IDLE_OFF_MASK (PP_ON | PP_SEQUENCE_MASK | 0 | 0)
#define IDLE_OFF_VALUE (0 | PP_SEQUENCE_NONE | 0 | 0)
#define IDLE_CYCLE_MASK (PP_ON | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
#define IDLE_CYCLE_VALUE (0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_OFF_IDLE)
static void wait_panel_status(struct intel_dp *intel_dp,
u32 mask,
u32 value)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp_stat_reg, pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
pp_stat_reg = _pp_stat_reg(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n",
mask, value,
I915_READ(pp_stat_reg),
I915_READ(pp_ctrl_reg));
if (_wait_for((I915_READ(pp_stat_reg) & mask) == value, 5000, 10)) {
DRM_ERROR("Panel status timeout: status %08x control %08x\n",
I915_READ(pp_stat_reg),
I915_READ(pp_ctrl_reg));
}
DRM_DEBUG_KMS("Wait complete\n");
}
static void wait_panel_on(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power on\n");
wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
}
static void wait_panel_off(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power off time\n");
wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
}
static void wait_panel_power_cycle(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power cycle\n");
/* When we disable the VDD override bit last we have to do the manual
* wait. */
wait_remaining_ms_from_jiffies(intel_dp->last_power_cycle,
intel_dp->panel_power_cycle_delay);
wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
}
static void wait_backlight_on(struct intel_dp *intel_dp)
{
wait_remaining_ms_from_jiffies(intel_dp->last_power_on,
intel_dp->backlight_on_delay);
}
static void edp_wait_backlight_off(struct intel_dp *intel_dp)
{
wait_remaining_ms_from_jiffies(intel_dp->last_backlight_off,
intel_dp->backlight_off_delay);
}
/* Read the current pp_control value, unlocking the register if it
* is locked
*/
static u32 ironlake_get_pp_control(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
u32 control;
lockdep_assert_held(&dev_priv->pps_mutex);
control = I915_READ(_pp_ctrl_reg(intel_dp));
control &= ~PANEL_UNLOCK_MASK;
control |= PANEL_UNLOCK_REGS;
return control;
}
/*
* Must be paired with edp_panel_vdd_off().
* Must hold pps_mutex around the whole on/off sequence.
* Can be nested with intel_edp_panel_vdd_{on,off}() calls.
*/
static bool edp_panel_vdd_on(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
u32 pp;
u32 pp_stat_reg, pp_ctrl_reg;
bool need_to_disable = !intel_dp->want_panel_vdd;
lockdep_assert_held(&dev_priv->pps_mutex);
if (!is_edp(intel_dp))
return false;
intel_dp->want_panel_vdd = true;
if (edp_have_panel_vdd(intel_dp))
return need_to_disable;
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_get(dev_priv, power_domain);
DRM_DEBUG_KMS("Turning eDP VDD on\n");
if (!edp_have_panel_power(intel_dp))
wait_panel_power_cycle(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
pp |= EDP_FORCE_VDD;
pp_stat_reg = _pp_stat_reg(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
/*
* If the panel wasn't on, delay before accessing aux channel
*/
if (!edp_have_panel_power(intel_dp)) {
DRM_DEBUG_KMS("eDP was not running\n");
msleep(intel_dp->panel_power_up_delay);
}
return need_to_disable;
}
/*
* Must be paired with intel_edp_panel_vdd_off() or
* intel_edp_panel_off().
* Nested calls to these functions are not allowed since
* we drop the lock. Caller must use some higher level
* locking to prevent nested calls from other threads.
*/
void intel_edp_panel_vdd_on(struct intel_dp *intel_dp)
{
bool vdd;
if (!is_edp(intel_dp))
return;
pps_lock(intel_dp);
vdd = edp_panel_vdd_on(intel_dp);
pps_unlock(intel_dp);
WARN(!vdd, "eDP VDD already requested on\n");
}
static void edp_panel_vdd_off_sync(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_digital_port *intel_dig_port =
dp_to_dig_port(intel_dp);
struct intel_encoder *intel_encoder = &intel_dig_port->base;
enum intel_display_power_domain power_domain;
u32 pp;
u32 pp_stat_reg, pp_ctrl_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
WARN_ON(intel_dp->want_panel_vdd);
if (!edp_have_panel_vdd(intel_dp))
return;
DRM_DEBUG_KMS("Turning eDP VDD off\n");
pp = ironlake_get_pp_control(intel_dp);
pp &= ~EDP_FORCE_VDD;
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
pp_stat_reg = _pp_stat_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
/* Make sure sequencer is idle before allowing subsequent activity */
DRM_DEBUG_KMS("PP_STATUS: 0x%08x PP_CONTROL: 0x%08x\n",
I915_READ(pp_stat_reg), I915_READ(pp_ctrl_reg));
if ((pp & POWER_TARGET_ON) == 0)
intel_dp->last_power_cycle = jiffies;
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_put(dev_priv, power_domain);
}
static void edp_panel_vdd_work(struct work_struct *__work)
{
struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
struct intel_dp, panel_vdd_work);
pps_lock(intel_dp);
if (!intel_dp->want_panel_vdd)
edp_panel_vdd_off_sync(intel_dp);
pps_unlock(intel_dp);
}
static void edp_panel_vdd_schedule_off(struct intel_dp *intel_dp)
{
unsigned long delay;
/*
* Queue the timer to fire a long time from now (relative to the power
* down delay) to keep the panel power up across a sequence of
* operations.
*/
delay = msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5);
schedule_delayed_work(&intel_dp->panel_vdd_work, delay);
}
/*
* Must be paired with edp_panel_vdd_on().
* Must hold pps_mutex around the whole on/off sequence.
* Can be nested with intel_edp_panel_vdd_{on,off}() calls.
*/
static void edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
struct drm_i915_private *dev_priv =
intel_dp_to_dev(intel_dp)->dev_private;
lockdep_assert_held(&dev_priv->pps_mutex);
if (!is_edp(intel_dp))
return;
WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");
intel_dp->want_panel_vdd = false;
if (sync)
edp_panel_vdd_off_sync(intel_dp);
else
edp_panel_vdd_schedule_off(intel_dp);
}
/*
* Must be paired with intel_edp_panel_vdd_on().
* Nested calls to these functions are not allowed since
* we drop the lock. Caller must use some higher level
* locking to prevent nested calls from other threads.
*/
static void intel_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
if (!is_edp(intel_dp))
return;
pps_lock(intel_dp);
edp_panel_vdd_off(intel_dp, sync);
pps_unlock(intel_dp);
}
void intel_edp_panel_on(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
u32 pp_ctrl_reg;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP power on\n");
pps_lock(intel_dp);
if (edp_have_panel_power(intel_dp)) {
DRM_DEBUG_KMS("eDP power already on\n");
goto out;
}
wait_panel_power_cycle(intel_dp);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
if (IS_GEN5(dev)) {
/* ILK workaround: disable reset around power sequence */
pp &= ~PANEL_POWER_RESET;
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
}
pp |= POWER_TARGET_ON;
if (!IS_GEN5(dev))
pp |= PANEL_POWER_RESET;
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
wait_panel_on(intel_dp);
intel_dp->last_power_on = jiffies;
if (IS_GEN5(dev)) {
pp |= PANEL_POWER_RESET; /* restore panel reset bit */
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
}
out:
pps_unlock(intel_dp);
}
void intel_edp_panel_off(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
u32 pp;
u32 pp_ctrl_reg;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP power off\n");
pps_lock(intel_dp);
WARN(!intel_dp->want_panel_vdd, "Need VDD to turn off panel\n");
pp = ironlake_get_pp_control(intel_dp);
/* We need to switch off panel power _and_ force vdd, for otherwise some
* panels get very unhappy and cease to work. */
pp &= ~(POWER_TARGET_ON | PANEL_POWER_RESET | EDP_FORCE_VDD |
EDP_BLC_ENABLE);
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
intel_dp->want_panel_vdd = false;
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
intel_dp->last_power_cycle = jiffies;
wait_panel_off(intel_dp);
/* We got a reference when we enabled the VDD. */
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_put(dev_priv, power_domain);
pps_unlock(intel_dp);
}
/* Enable backlight in the panel power control. */
static void _intel_edp_backlight_on(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
u32 pp_ctrl_reg;
/*
* If we enable the backlight right away following a panel power
* on, we may see slight flicker as the panel syncs with the eDP
* link. So delay a bit to make sure the image is solid before
* allowing it to appear.
*/
wait_backlight_on(intel_dp);
pps_lock(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
pp |= EDP_BLC_ENABLE;
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
pps_unlock(intel_dp);
}
/* Enable backlight PWM and backlight PP control. */
void intel_edp_backlight_on(struct intel_dp *intel_dp)
{
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("\n");
intel_panel_enable_backlight(intel_dp->attached_connector);
_intel_edp_backlight_on(intel_dp);
}
/* Disable backlight in the panel power control. */
static void _intel_edp_backlight_off(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
u32 pp_ctrl_reg;
if (!is_edp(intel_dp))
return;
pps_lock(intel_dp);
pp = ironlake_get_pp_control(intel_dp);
pp &= ~EDP_BLC_ENABLE;
pp_ctrl_reg = _pp_ctrl_reg(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
POSTING_READ(pp_ctrl_reg);
pps_unlock(intel_dp);
intel_dp->last_backlight_off = jiffies;
edp_wait_backlight_off(intel_dp);
}
/* Disable backlight PP control and backlight PWM. */
void intel_edp_backlight_off(struct intel_dp *intel_dp)
{
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("\n");
_intel_edp_backlight_off(intel_dp);
intel_panel_disable_backlight(intel_dp->attached_connector);
}
/*
* Hook for controlling the panel power control backlight through the bl_power
* sysfs attribute. Take care to handle multiple calls.
*/
static void intel_edp_backlight_power(struct intel_connector *connector,
bool enable)
{
struct intel_dp *intel_dp = intel_attached_dp(&connector->base);
bool is_enabled;
pps_lock(intel_dp);
is_enabled = ironlake_get_pp_control(intel_dp) & EDP_BLC_ENABLE;
pps_unlock(intel_dp);
if (is_enabled == enable)
return;
DRM_DEBUG_KMS("panel power control backlight %s\n",
enable ? "enable" : "disable");
if (enable)
_intel_edp_backlight_on(intel_dp);
else
_intel_edp_backlight_off(intel_dp);
}
static void ironlake_edp_pll_on(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpa_ctl;
assert_pipe_disabled(dev_priv,
to_intel_crtc(crtc)->pipe);
DRM_DEBUG_KMS("\n");
dpa_ctl = I915_READ(DP_A);
WARN(dpa_ctl & DP_PLL_ENABLE, "dp pll on, should be off\n");
WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n");
/* We don't adjust intel_dp->DP while tearing down the link, to
* facilitate link retraining (e.g. after hotplug). Hence clear all
* enable bits here to ensure that we don't enable too much. */
intel_dp->DP &= ~(DP_PORT_EN | DP_AUDIO_OUTPUT_ENABLE);
intel_dp->DP |= DP_PLL_ENABLE;
I915_WRITE(DP_A, intel_dp->DP);
POSTING_READ(DP_A);
udelay(200);
}
static void ironlake_edp_pll_off(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpa_ctl;
assert_pipe_disabled(dev_priv,
to_intel_crtc(crtc)->pipe);
dpa_ctl = I915_READ(DP_A);
WARN((dpa_ctl & DP_PLL_ENABLE) == 0,
"dp pll off, should be on\n");
WARN(dpa_ctl & DP_PORT_EN, "dp port still on, should be off\n");
/* We can't rely on the value tracked for the DP register in
* intel_dp->DP because link_down must not change that (otherwise link
* re-training will fail. */
dpa_ctl &= ~DP_PLL_ENABLE;
I915_WRITE(DP_A, dpa_ctl);
POSTING_READ(DP_A);
udelay(200);
}
/* If the sink supports it, try to set the power state appropriately */
void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
{
int ret, i;
/* Should have a valid DPCD by this point */
if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)
return;
if (mode != DRM_MODE_DPMS_ON) {
ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
DP_SET_POWER_D3);
} else {
/*
* When turning on, we need to retry for 1ms to give the sink
* time to wake up.
*/
for (i = 0; i < 3; i++) {
ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER,
DP_SET_POWER_D0);
if (ret == 1)
break;
msleep(1);
}
}
if (ret != 1)
DRM_DEBUG_KMS("failed to %s sink power state\n",
mode == DRM_MODE_DPMS_ON ? "enable" : "disable");
}
static bool intel_dp_get_hw_state(struct intel_encoder *encoder,
enum pipe *pipe)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = dp_to_dig_port(intel_dp)->port;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
u32 tmp;
power_domain = intel_display_port_power_domain(encoder);
if (!intel_display_power_enabled(dev_priv, power_domain))
return false;
tmp = I915_READ(intel_dp->output_reg);
if (!(tmp & DP_PORT_EN))
return false;
if (port == PORT_A && IS_GEN7(dev) && !IS_VALLEYVIEW(dev)) {
*pipe = PORT_TO_PIPE_CPT(tmp);
} else if (IS_CHERRYVIEW(dev)) {
*pipe = DP_PORT_TO_PIPE_CHV(tmp);
} else if (!HAS_PCH_CPT(dev) || port == PORT_A) {
*pipe = PORT_TO_PIPE(tmp);
} else {
u32 trans_sel;
u32 trans_dp;
int i;
switch (intel_dp->output_reg) {
case PCH_DP_B:
trans_sel = TRANS_DP_PORT_SEL_B;
break;
case PCH_DP_C:
trans_sel = TRANS_DP_PORT_SEL_C;
break;
case PCH_DP_D:
trans_sel = TRANS_DP_PORT_SEL_D;
break;
default:
return true;
}
for_each_pipe(dev_priv, i) {
trans_dp = I915_READ(TRANS_DP_CTL(i));
if ((trans_dp & TRANS_DP_PORT_SEL_MASK) == trans_sel) {
*pipe = i;
return true;
}
}
DRM_DEBUG_KMS("No pipe for dp port 0x%x found\n",
intel_dp->output_reg);
}
return true;
}
static void intel_dp_get_config(struct intel_encoder *encoder,
struct intel_crtc_config *pipe_config)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
u32 tmp, flags = 0;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = dp_to_dig_port(intel_dp)->port;
struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
int dotclock;
tmp = I915_READ(intel_dp->output_reg);
if (tmp & DP_AUDIO_OUTPUT_ENABLE)
pipe_config->has_audio = true;
if ((port == PORT_A) || !HAS_PCH_CPT(dev)) {
if (tmp & DP_SYNC_HS_HIGH)
flags |= DRM_MODE_FLAG_PHSYNC;
else
flags |= DRM_MODE_FLAG_NHSYNC;
if (tmp & DP_SYNC_VS_HIGH)
flags |= DRM_MODE_FLAG_PVSYNC;
else
flags |= DRM_MODE_FLAG_NVSYNC;
} else {
tmp = I915_READ(TRANS_DP_CTL(crtc->pipe));
if (tmp & TRANS_DP_HSYNC_ACTIVE_HIGH)
flags |= DRM_MODE_FLAG_PHSYNC;
else
flags |= DRM_MODE_FLAG_NHSYNC;
if (tmp & TRANS_DP_VSYNC_ACTIVE_HIGH)
flags |= DRM_MODE_FLAG_PVSYNC;
else
flags |= DRM_MODE_FLAG_NVSYNC;
}
pipe_config->adjusted_mode.flags |= flags;
if (!HAS_PCH_SPLIT(dev) && !IS_VALLEYVIEW(dev) &&
tmp & DP_COLOR_RANGE_16_235)
pipe_config->limited_color_range = true;
pipe_config->has_dp_encoder = true;
intel_dp_get_m_n(crtc, pipe_config);
if (port == PORT_A) {
if ((I915_READ(DP_A) & DP_PLL_FREQ_MASK) == DP_PLL_FREQ_160MHZ)
pipe_config->port_clock = 162000;
else
pipe_config->port_clock = 270000;
}
dotclock = intel_dotclock_calculate(pipe_config->port_clock,
&pipe_config->dp_m_n);
if (HAS_PCH_SPLIT(dev_priv->dev) && port != PORT_A)
ironlake_check_encoder_dotclock(pipe_config, dotclock);
pipe_config->adjusted_mode.crtc_clock = dotclock;
if (is_edp(intel_dp) && dev_priv->vbt.edp_bpp &&
pipe_config->pipe_bpp > dev_priv->vbt.edp_bpp) {
/*
* This is a big fat ugly hack.
*
* Some machines in UEFI boot mode provide us a VBT that has 18
* bpp and 1.62 GHz link bandwidth for eDP, which for reasons
* unknown we fail to light up. Yet the same BIOS boots up with
* 24 bpp and 2.7 GHz link. Use the same bpp as the BIOS uses as
* max, not what it tells us to use.
*
* Note: This will still be broken if the eDP panel is not lit
* up by the BIOS, and thus we can't get the mode at module
* load.
*/
DRM_DEBUG_KMS("pipe has %d bpp for eDP panel, overriding BIOS-provided max %d bpp\n",
pipe_config->pipe_bpp, dev_priv->vbt.edp_bpp);
dev_priv->vbt.edp_bpp = pipe_config->pipe_bpp;
}
}
static bool is_edp_psr(struct intel_dp *intel_dp)
{
return intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED;
}
static bool intel_edp_is_psr_enabled(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (!HAS_PSR(dev))
return false;
return I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE;
}
static void intel_edp_psr_write_vsc(struct intel_dp *intel_dp,
struct edp_vsc_psr *vsc_psr)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *crtc = to_intel_crtc(dig_port->base.base.crtc);
u32 ctl_reg = HSW_TVIDEO_DIP_CTL(crtc->config.cpu_transcoder);
u32 data_reg = HSW_TVIDEO_DIP_VSC_DATA(crtc->config.cpu_transcoder);
uint32_t *data = (uint32_t *) vsc_psr;
unsigned int i;
/* As per BSPec (Pipe Video Data Island Packet), we need to disable
the video DIP being updated before program video DIP data buffer
registers for DIP being updated. */
I915_WRITE(ctl_reg, 0);
POSTING_READ(ctl_reg);
for (i = 0; i < VIDEO_DIP_VSC_DATA_SIZE; i += 4) {
if (i < sizeof(struct edp_vsc_psr))
I915_WRITE(data_reg + i, *data++);
else
I915_WRITE(data_reg + i, 0);
}
I915_WRITE(ctl_reg, VIDEO_DIP_ENABLE_VSC_HSW);
POSTING_READ(ctl_reg);
}
static void intel_edp_psr_setup(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
struct edp_vsc_psr psr_vsc;
/* Prepare VSC packet as per EDP 1.3 spec, Table 3.10 */
memset(&psr_vsc, 0, sizeof(psr_vsc));
psr_vsc.sdp_header.HB0 = 0;
psr_vsc.sdp_header.HB1 = 0x7;
psr_vsc.sdp_header.HB2 = 0x2;
psr_vsc.sdp_header.HB3 = 0x8;
intel_edp_psr_write_vsc(intel_dp, &psr_vsc);
/* Avoid continuous PSR exit by masking memup and hpd */
I915_WRITE(EDP_PSR_DEBUG_CTL(dev), EDP_PSR_DEBUG_MASK_MEMUP |
EDP_PSR_DEBUG_MASK_HPD | EDP_PSR_DEBUG_MASK_LPSP);
}
static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t aux_clock_divider;
int precharge = 0x3;
int msg_size = 5; /* Header(4) + Message(1) */
bool only_standby = false;
aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
only_standby = true;
/* Enable PSR in sink */
if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby)
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
DP_PSR_ENABLE & ~DP_PSR_MAIN_LINK_ACTIVE);
else
drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
/* Setup AUX registers */
I915_WRITE(EDP_PSR_AUX_DATA1(dev), EDP_PSR_DPCD_COMMAND);
I915_WRITE(EDP_PSR_AUX_DATA2(dev), EDP_PSR_DPCD_NORMAL_OPERATION);
I915_WRITE(EDP_PSR_AUX_CTL(dev),
DP_AUX_CH_CTL_TIME_OUT_400us |
(msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
(precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
(aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
}
static void intel_edp_psr_enable_source(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t max_sleep_time = 0x1f;
uint32_t idle_frames = 1;
uint32_t val = 0x0;
const uint32_t link_entry_time = EDP_PSR_MIN_LINK_ENTRY_TIME_8_LINES;
bool only_standby = false;
if (IS_BROADWELL(dev) && dig_port->port != PORT_A)
only_standby = true;
if (intel_dp->psr_dpcd[1] & DP_PSR_NO_TRAIN_ON_EXIT || only_standby) {
val |= EDP_PSR_LINK_STANDBY;
val |= EDP_PSR_TP2_TP3_TIME_0us;
val |= EDP_PSR_TP1_TIME_0us;
val |= EDP_PSR_SKIP_AUX_EXIT;
val |= IS_BROADWELL(dev) ? BDW_PSR_SINGLE_FRAME : 0;
} else
val |= EDP_PSR_LINK_DISABLE;
I915_WRITE(EDP_PSR_CTL(dev), val |
(IS_BROADWELL(dev) ? 0 : link_entry_time) |
max_sleep_time << EDP_PSR_MAX_SLEEP_TIME_SHIFT |
idle_frames << EDP_PSR_IDLE_FRAME_SHIFT |
EDP_PSR_ENABLE);
}
static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc = dig_port->base.base.crtc;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
lockdep_assert_held(&dev_priv->psr.lock);
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
WARN_ON(!drm_modeset_is_locked(&crtc->mutex));
dev_priv->psr.source_ok = false;
if (IS_HASWELL(dev) && dig_port->port != PORT_A) {
DRM_DEBUG_KMS("HSW ties PSR to DDI A (eDP)\n");
return false;
}
if (!i915.enable_psr) {
DRM_DEBUG_KMS("PSR disable by flag\n");
return false;
}
/* Below limitations aren't valid for Broadwell */
if (IS_BROADWELL(dev))
goto out;
if (I915_READ(HSW_STEREO_3D_CTL(intel_crtc->config.cpu_transcoder)) &
S3D_ENABLE) {
DRM_DEBUG_KMS("PSR condition failed: Stereo 3D is Enabled\n");
return false;
}
if (intel_crtc->config.adjusted_mode.flags & DRM_MODE_FLAG_INTERLACE) {
DRM_DEBUG_KMS("PSR condition failed: Interlaced is Enabled\n");
return false;
}
out:
dev_priv->psr.source_ok = true;
return true;
}
static void intel_edp_psr_do_enable(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
WARN_ON(dev_priv->psr.active);
lockdep_assert_held(&dev_priv->psr.lock);
/* Enable PSR on the panel */
intel_edp_psr_enable_sink(intel_dp);
/* Enable PSR on the host */
intel_edp_psr_enable_source(intel_dp);
dev_priv->psr.active = true;
}
void intel_edp_psr_enable(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
if (!HAS_PSR(dev)) {
DRM_DEBUG_KMS("PSR not supported on this platform\n");
return;
}
if (!is_edp_psr(intel_dp)) {
DRM_DEBUG_KMS("PSR not supported by this panel\n");
return;
}
mutex_lock(&dev_priv->psr.lock);
if (dev_priv->psr.enabled) {
DRM_DEBUG_KMS("PSR already in use\n");
mutex_unlock(&dev_priv->psr.lock);
return;
}
dev_priv->psr.busy_frontbuffer_bits = 0;
/* Setup PSR once */
intel_edp_psr_setup(intel_dp);
if (intel_edp_psr_match_conditions(intel_dp))
dev_priv->psr.enabled = intel_dp;
mutex_unlock(&dev_priv->psr.lock);
}
void intel_edp_psr_disable(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
mutex_lock(&dev_priv->psr.lock);
if (!dev_priv->psr.enabled) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
if (dev_priv->psr.active) {
I915_WRITE(EDP_PSR_CTL(dev),
I915_READ(EDP_PSR_CTL(dev)) & ~EDP_PSR_ENABLE);
/* Wait till PSR is idle */
if (_wait_for((I915_READ(EDP_PSR_STATUS_CTL(dev)) &
EDP_PSR_STATUS_STATE_MASK) == 0, 2000, 10))
DRM_ERROR("Timed out waiting for PSR Idle State\n");
dev_priv->psr.active = false;
} else {
WARN_ON(I915_READ(EDP_PSR_CTL(dev)) & EDP_PSR_ENABLE);
}
dev_priv->psr.enabled = NULL;
mutex_unlock(&dev_priv->psr.lock);
cancel_delayed_work_sync(&dev_priv->psr.work);
}
static void intel_edp_psr_work(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, typeof(*dev_priv), psr.work.work);
struct intel_dp *intel_dp = dev_priv->psr.enabled;
mutex_lock(&dev_priv->psr.lock);
intel_dp = dev_priv->psr.enabled;
if (!intel_dp)
goto unlock;
/*
* The delayed work can race with an invalidate hence we need to
* recheck. Since psr_flush first clears this and then reschedules we
* won't ever miss a flush when bailing out here.
*/
if (dev_priv->psr.busy_frontbuffer_bits)
goto unlock;
intel_edp_psr_do_enable(intel_dp);
unlock:
mutex_unlock(&dev_priv->psr.lock);
}
static void intel_edp_psr_do_exit(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
if (dev_priv->psr.active) {
u32 val = I915_READ(EDP_PSR_CTL(dev));
WARN_ON(!(val & EDP_PSR_ENABLE));
I915_WRITE(EDP_PSR_CTL(dev), val & ~EDP_PSR_ENABLE);
dev_priv->psr.active = false;
}
}
void intel_edp_psr_invalidate(struct drm_device *dev,
unsigned frontbuffer_bits)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc;
enum pipe pipe;
mutex_lock(&dev_priv->psr.lock);
if (!dev_priv->psr.enabled) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
pipe = to_intel_crtc(crtc)->pipe;
intel_edp_psr_do_exit(dev);
frontbuffer_bits &= INTEL_FRONTBUFFER_ALL_MASK(pipe);
dev_priv->psr.busy_frontbuffer_bits |= frontbuffer_bits;
mutex_unlock(&dev_priv->psr.lock);
}
void intel_edp_psr_flush(struct drm_device *dev,
unsigned frontbuffer_bits)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_crtc *crtc;
enum pipe pipe;
mutex_lock(&dev_priv->psr.lock);
if (!dev_priv->psr.enabled) {
mutex_unlock(&dev_priv->psr.lock);
return;
}
crtc = dp_to_dig_port(dev_priv->psr.enabled)->base.base.crtc;
pipe = to_intel_crtc(crtc)->pipe;
dev_priv->psr.busy_frontbuffer_bits &= ~frontbuffer_bits;
/*
* On Haswell sprite plane updates don't result in a psr invalidating
* signal in the hardware. Which means we need to manually fake this in
* software for all flushes, not just when we've seen a preceding
* invalidation through frontbuffer rendering.
*/
if (IS_HASWELL(dev) &&
(frontbuffer_bits & INTEL_FRONTBUFFER_SPRITE(pipe)))
intel_edp_psr_do_exit(dev);
if (!dev_priv->psr.active && !dev_priv->psr.busy_frontbuffer_bits)
schedule_delayed_work(&dev_priv->psr.work,
msecs_to_jiffies(100));
mutex_unlock(&dev_priv->psr.lock);
}
void intel_edp_psr_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
INIT_DELAYED_WORK(&dev_priv->psr.work, intel_edp_psr_work);
mutex_init(&dev_priv->psr.lock);
}
static void intel_disable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct drm_device *dev = encoder->base.dev;
/* Make sure the panel is off before trying to change the mode. But also
* ensure that we have vdd while we switch off the panel. */
intel_edp_panel_vdd_on(intel_dp);
intel_edp_backlight_off(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
intel_edp_panel_off(intel_dp);
/* disable the port before the pipe on g4x */
if (INTEL_INFO(dev)->gen < 5)
intel_dp_link_down(intel_dp);
}
static void ilk_post_disable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
enum port port = dp_to_dig_port(intel_dp)->port;
intel_dp_link_down(intel_dp);
if (port == PORT_A)
ironlake_edp_pll_off(intel_dp);
}
static void vlv_post_disable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
intel_dp_link_down(intel_dp);
}
static void chv_post_disable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc =
to_intel_crtc(encoder->base.crtc);
enum dpio_channel ch = vlv_dport_to_channel(dport);
enum pipe pipe = intel_crtc->pipe;
u32 val;
intel_dp_link_down(intel_dp);
mutex_lock(&dev_priv->dpio_lock);
/* Propagate soft reset to data lane reset */
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
val |= CHV_PCS_REQ_SOFTRESET_EN;
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
val |= CHV_PCS_REQ_SOFTRESET_EN;
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
val &= ~(DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
mutex_unlock(&dev_priv->dpio_lock);
}
static void
_intel_dp_set_link_train(struct intel_dp *intel_dp,
uint32_t *DP,
uint8_t dp_train_pat)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = intel_dig_port->port;
if (HAS_DDI(dev)) {
uint32_t temp = I915_READ(DP_TP_CTL(port));
if (dp_train_pat & DP_LINK_SCRAMBLING_DISABLE)
temp |= DP_TP_CTL_SCRAMBLE_DISABLE;
else
temp &= ~DP_TP_CTL_SCRAMBLE_DISABLE;
temp &= ~DP_TP_CTL_LINK_TRAIN_MASK;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
temp |= DP_TP_CTL_LINK_TRAIN_NORMAL;
break;
case DP_TRAINING_PATTERN_1:
temp |= DP_TP_CTL_LINK_TRAIN_PAT1;
break;
case DP_TRAINING_PATTERN_2:
temp |= DP_TP_CTL_LINK_TRAIN_PAT2;
break;
case DP_TRAINING_PATTERN_3:
temp |= DP_TP_CTL_LINK_TRAIN_PAT3;
break;
}
I915_WRITE(DP_TP_CTL(port), temp);
} else if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) {
*DP &= ~DP_LINK_TRAIN_MASK_CPT;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
*DP |= DP_LINK_TRAIN_OFF_CPT;
break;
case DP_TRAINING_PATTERN_1:
*DP |= DP_LINK_TRAIN_PAT_1_CPT;
break;
case DP_TRAINING_PATTERN_2:
*DP |= DP_LINK_TRAIN_PAT_2_CPT;
break;
case DP_TRAINING_PATTERN_3:
DRM_ERROR("DP training pattern 3 not supported\n");
*DP |= DP_LINK_TRAIN_PAT_2_CPT;
break;
}
} else {
if (IS_CHERRYVIEW(dev))
*DP &= ~DP_LINK_TRAIN_MASK_CHV;
else
*DP &= ~DP_LINK_TRAIN_MASK;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
*DP |= DP_LINK_TRAIN_OFF;
break;
case DP_TRAINING_PATTERN_1:
*DP |= DP_LINK_TRAIN_PAT_1;
break;
case DP_TRAINING_PATTERN_2:
*DP |= DP_LINK_TRAIN_PAT_2;
break;
case DP_TRAINING_PATTERN_3:
if (IS_CHERRYVIEW(dev)) {
*DP |= DP_LINK_TRAIN_PAT_3_CHV;
} else {
DRM_ERROR("DP training pattern 3 not supported\n");
*DP |= DP_LINK_TRAIN_PAT_2;
}
break;
}
}
}
static void intel_dp_enable_port(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
intel_dp->DP |= DP_PORT_EN;
/* enable with pattern 1 (as per spec) */
_intel_dp_set_link_train(intel_dp, &intel_dp->DP,
DP_TRAINING_PATTERN_1);
I915_WRITE(intel_dp->output_reg, intel_dp->DP);
POSTING_READ(intel_dp->output_reg);
}
static void intel_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
if (WARN_ON(dp_reg & DP_PORT_EN))
return;
intel_dp_enable_port(intel_dp);
intel_edp_panel_vdd_on(intel_dp);
intel_edp_panel_on(intel_dp);
intel_edp_panel_vdd_off(intel_dp, true);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp);
intel_dp_stop_link_train(intel_dp);
}
static void g4x_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
intel_enable_dp(encoder);
intel_edp_backlight_on(intel_dp);
}
static void vlv_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
intel_edp_backlight_on(intel_dp);
}
static void g4x_pre_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
intel_dp_prepare(encoder);
/* Only ilk+ has port A */
if (dport->port == PORT_A) {
ironlake_set_pll_cpu_edp(intel_dp);
ironlake_edp_pll_on(intel_dp);
}
}
static void vlv_steal_power_sequencer(struct drm_device *dev,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_encoder *encoder;
lockdep_assert_held(&dev_priv->pps_mutex);
list_for_each_entry(encoder, &dev->mode_config.encoder_list,
base.head) {
struct intel_dp *intel_dp;
enum port port;
if (encoder->type != INTEL_OUTPUT_EDP)
continue;
intel_dp = enc_to_intel_dp(&encoder->base);
port = dp_to_dig_port(intel_dp)->port;
if (intel_dp->pps_pipe != pipe)
continue;
DRM_DEBUG_KMS("stealing pipe %c power sequencer from port %c\n",
pipe_name(pipe), port_name(port));
/* make sure vdd is off before we steal it */
edp_panel_vdd_off_sync(intel_dp);
intel_dp->pps_pipe = INVALID_PIPE;
}
}
static void vlv_init_panel_power_sequencer(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *encoder = &intel_dig_port->base;
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
struct edp_power_seq power_seq;
lockdep_assert_held(&dev_priv->pps_mutex);
if (intel_dp->pps_pipe == crtc->pipe)
return;
/*
* If another power sequencer was being used on this
* port previously make sure to turn off vdd there while
* we still have control of it.
*/
if (intel_dp->pps_pipe != INVALID_PIPE)
edp_panel_vdd_off_sync(intel_dp);
/*
* We may be stealing the power
* sequencer from another port.
*/
vlv_steal_power_sequencer(dev, crtc->pipe);
/* now it's all ours */
intel_dp->pps_pipe = crtc->pipe;
DRM_DEBUG_KMS("initializing pipe %c power sequencer for port %c\n",
pipe_name(intel_dp->pps_pipe), port_name(intel_dig_port->port));
/* init power sequencer on this pipe and port */
intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
intel_dp_init_panel_power_sequencer_registers(dev, intel_dp,
&power_seq);
}
static void vlv_pre_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
enum dpio_channel port = vlv_dport_to_channel(dport);
int pipe = intel_crtc->pipe;
u32 val;
mutex_lock(&dev_priv->dpio_lock);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(port));
val = 0;
if (pipe)
val |= (1<<21);
else
val &= ~(1<<21);
val |= 0x001000c4;
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW8(port), val);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW14(port), 0x00760018);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW23(port), 0x00400888);
mutex_unlock(&dev_priv->dpio_lock);
if (is_edp(intel_dp)) {
pps_lock(intel_dp);
vlv_init_panel_power_sequencer(intel_dp);
pps_unlock(intel_dp);
}
intel_enable_dp(encoder);
vlv_wait_port_ready(dev_priv, dport);
}
static void vlv_dp_pre_pll_enable(struct intel_encoder *encoder)
{
struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc =
to_intel_crtc(encoder->base.crtc);
enum dpio_channel port = vlv_dport_to_channel(dport);
int pipe = intel_crtc->pipe;
intel_dp_prepare(encoder);
/* Program Tx lane resets to default */
mutex_lock(&dev_priv->dpio_lock);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW0(port),
DPIO_PCS_TX_LANE2_RESET |
DPIO_PCS_TX_LANE1_RESET);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW1(port),
DPIO_PCS_CLK_CRI_RXEB_EIOS_EN |
DPIO_PCS_CLK_CRI_RXDIGFILTSG_EN |
(1<<DPIO_PCS_CLK_DATAWIDTH_SHIFT) |
DPIO_PCS_CLK_SOFT_RESET);
/* Fix up inter-pair skew failure */
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW12(port), 0x00750f00);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW11(port), 0x00001500);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW14(port), 0x40400000);
mutex_unlock(&dev_priv->dpio_lock);
}
static void chv_pre_enable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc =
to_intel_crtc(encoder->base.crtc);
enum dpio_channel ch = vlv_dport_to_channel(dport);
int pipe = intel_crtc->pipe;
int data, i;
u32 val;
mutex_lock(&dev_priv->dpio_lock);
/* Deassert soft data lane reset*/
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW1(ch));
val |= CHV_PCS_REQ_SOFTRESET_EN;
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW1(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW1(ch));
val |= CHV_PCS_REQ_SOFTRESET_EN;
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW1(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW0(ch));
val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW0(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW0(ch));
val |= (DPIO_PCS_TX_LANE2_RESET | DPIO_PCS_TX_LANE1_RESET);
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW0(ch), val);
/* Program Tx lane latency optimal setting*/
for (i = 0; i < 4; i++) {
/* Set the latency optimal bit */
data = (i == 1) ? 0x0 : 0x6;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW11(ch, i),
data << DPIO_FRC_LATENCY_SHFIT);
/* Set the upar bit */
data = (i == 1) ? 0x0 : 0x1;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW14(ch, i),
data << DPIO_UPAR_SHIFT);
}
/* Data lane stagger programming */
/* FIXME: Fix up value only after power analysis */
mutex_unlock(&dev_priv->dpio_lock);
if (is_edp(intel_dp)) {
pps_lock(intel_dp);
vlv_init_panel_power_sequencer(intel_dp);
pps_unlock(intel_dp);
}
intel_enable_dp(encoder);
vlv_wait_port_ready(dev_priv, dport);
}
static void chv_dp_pre_pll_enable(struct intel_encoder *encoder)
{
struct intel_digital_port *dport = enc_to_dig_port(&encoder->base);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc =
to_intel_crtc(encoder->base.crtc);
enum dpio_channel ch = vlv_dport_to_channel(dport);
enum pipe pipe = intel_crtc->pipe;
u32 val;
intel_dp_prepare(encoder);
mutex_lock(&dev_priv->dpio_lock);
/* program left/right clock distribution */
if (pipe != PIPE_B) {
val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW5_CH0);
val &= ~(CHV_BUFLEFTENA1_MASK | CHV_BUFRIGHTENA1_MASK);
if (ch == DPIO_CH0)
val |= CHV_BUFLEFTENA1_FORCE;
if (ch == DPIO_CH1)
val |= CHV_BUFRIGHTENA1_FORCE;
vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW5_CH0, val);
} else {
val = vlv_dpio_read(dev_priv, pipe, _CHV_CMN_DW1_CH1);
val &= ~(CHV_BUFLEFTENA2_MASK | CHV_BUFRIGHTENA2_MASK);
if (ch == DPIO_CH0)
val |= CHV_BUFLEFTENA2_FORCE;
if (ch == DPIO_CH1)
val |= CHV_BUFRIGHTENA2_FORCE;
vlv_dpio_write(dev_priv, pipe, _CHV_CMN_DW1_CH1, val);
}
/* program clock channel usage */
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW8(ch));
val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
if (pipe != PIPE_B)
val &= ~CHV_PCS_USEDCLKCHANNEL;
else
val |= CHV_PCS_USEDCLKCHANNEL;
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW8(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW8(ch));
val |= CHV_PCS_USEDCLKCHANNEL_OVRRIDE;
if (pipe != PIPE_B)
val &= ~CHV_PCS_USEDCLKCHANNEL;
else
val |= CHV_PCS_USEDCLKCHANNEL;
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW8(ch), val);
/*
* This a a bit weird since generally CL
* matches the pipe, but here we need to
* pick the CL based on the port.
*/
val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW19(ch));
if (pipe != PIPE_B)
val &= ~CHV_CMN_USEDCLKCHANNEL;
else
val |= CHV_CMN_USEDCLKCHANNEL;
vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW19(ch), val);
mutex_unlock(&dev_priv->dpio_lock);
}
/*
* Native read with retry for link status and receiver capability reads for
* cases where the sink may still be asleep.
*
* Sinks are *supposed* to come up within 1ms from an off state, but we're also
* supposed to retry 3 times per the spec.
*/
static ssize_t
intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset,
void *buffer, size_t size)
{
ssize_t ret;
int i;
/*
* Sometime we just get the same incorrect byte repeated
* over the entire buffer. Doing just one throw away read
* initially seems to "solve" it.
*/
drm_dp_dpcd_read(aux, DP_DPCD_REV, buffer, 1);
for (i = 0; i < 3; i++) {
ret = drm_dp_dpcd_read(aux, offset, buffer, size);
if (ret == size)
return ret;
msleep(1);
}
return ret;
}
/*
* Fetch AUX CH registers 0x202 - 0x207 which contain
* link status information
*/
static bool
intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
{
return intel_dp_dpcd_read_wake(&intel_dp->aux,
DP_LANE0_1_STATUS,
link_status,
DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE;
}
/* These are source-specific values. */
static uint8_t
intel_dp_voltage_max(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
enum port port = dp_to_dig_port(intel_dp)->port;
if (IS_VALLEYVIEW(dev))
return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
else if (IS_GEN7(dev) && port == PORT_A)
return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
else if (HAS_PCH_CPT(dev) && port != PORT_A)
return DP_TRAIN_VOLTAGE_SWING_LEVEL_3;
else
return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
}
static uint8_t
intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
enum port port = dp_to_dig_port(intel_dp)->port;
if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
return DP_TRAIN_PRE_EMPH_LEVEL_3;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
return DP_TRAIN_PRE_EMPH_LEVEL_2;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
return DP_TRAIN_PRE_EMPH_LEVEL_1;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
default:
return DP_TRAIN_PRE_EMPH_LEVEL_0;
}
} else if (IS_VALLEYVIEW(dev)) {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
return DP_TRAIN_PRE_EMPH_LEVEL_3;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
return DP_TRAIN_PRE_EMPH_LEVEL_2;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
return DP_TRAIN_PRE_EMPH_LEVEL_1;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
default:
return DP_TRAIN_PRE_EMPH_LEVEL_0;
}
} else if (IS_GEN7(dev) && port == PORT_A) {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
return DP_TRAIN_PRE_EMPH_LEVEL_2;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
return DP_TRAIN_PRE_EMPH_LEVEL_1;
default:
return DP_TRAIN_PRE_EMPH_LEVEL_0;
}
} else {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
return DP_TRAIN_PRE_EMPH_LEVEL_2;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
return DP_TRAIN_PRE_EMPH_LEVEL_2;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
return DP_TRAIN_PRE_EMPH_LEVEL_1;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
default:
return DP_TRAIN_PRE_EMPH_LEVEL_0;
}
}
}
static uint32_t intel_vlv_signal_levels(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct intel_crtc *intel_crtc =
to_intel_crtc(dport->base.base.crtc);
unsigned long demph_reg_value, preemph_reg_value,
uniqtranscale_reg_value;
uint8_t train_set = intel_dp->train_set[0];
enum dpio_channel port = vlv_dport_to_channel(dport);
int pipe = intel_crtc->pipe;
switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
case DP_TRAIN_PRE_EMPH_LEVEL_0:
preemph_reg_value = 0x0004000;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
demph_reg_value = 0x2B405555;
uniqtranscale_reg_value = 0x552AB83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
demph_reg_value = 0x2B404040;
uniqtranscale_reg_value = 0x5548B83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
demph_reg_value = 0x2B245555;
uniqtranscale_reg_value = 0x5560B83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
demph_reg_value = 0x2B405555;
uniqtranscale_reg_value = 0x5598DA3A;
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_1:
preemph_reg_value = 0x0002000;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
demph_reg_value = 0x2B404040;
uniqtranscale_reg_value = 0x5552B83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
demph_reg_value = 0x2B404848;
uniqtranscale_reg_value = 0x5580B83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
demph_reg_value = 0x2B404040;
uniqtranscale_reg_value = 0x55ADDA3A;
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_2:
preemph_reg_value = 0x0000000;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
demph_reg_value = 0x2B305555;
uniqtranscale_reg_value = 0x5570B83A;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
demph_reg_value = 0x2B2B4040;
uniqtranscale_reg_value = 0x55ADDA3A;
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_3:
preemph_reg_value = 0x0006000;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
demph_reg_value = 0x1B405555;
uniqtranscale_reg_value = 0x55ADDA3A;
break;
default:
return 0;
}
break;
default:
return 0;
}
mutex_lock(&dev_priv->dpio_lock);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x00000000);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW4(port), demph_reg_value);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW2(port),
uniqtranscale_reg_value);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW3(port), 0x0C782040);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW11(port), 0x00030000);
vlv_dpio_write(dev_priv, pipe, VLV_PCS_DW9(port), preemph_reg_value);
vlv_dpio_write(dev_priv, pipe, VLV_TX_DW5(port), 0x80000000);
mutex_unlock(&dev_priv->dpio_lock);
return 0;
}
static uint32_t intel_chv_signal_levels(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_digital_port *dport = dp_to_dig_port(intel_dp);
struct intel_crtc *intel_crtc = to_intel_crtc(dport->base.base.crtc);
u32 deemph_reg_value, margin_reg_value, val;
uint8_t train_set = intel_dp->train_set[0];
enum dpio_channel ch = vlv_dport_to_channel(dport);
enum pipe pipe = intel_crtc->pipe;
int i;
switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
case DP_TRAIN_PRE_EMPH_LEVEL_0:
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
deemph_reg_value = 128;
margin_reg_value = 52;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
deemph_reg_value = 128;
margin_reg_value = 77;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
deemph_reg_value = 128;
margin_reg_value = 102;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
deemph_reg_value = 128;
margin_reg_value = 154;
/* FIXME extra to set for 1200 */
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_1:
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
deemph_reg_value = 85;
margin_reg_value = 78;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
deemph_reg_value = 85;
margin_reg_value = 116;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
deemph_reg_value = 85;
margin_reg_value = 154;
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_2:
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
deemph_reg_value = 64;
margin_reg_value = 104;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
deemph_reg_value = 64;
margin_reg_value = 154;
break;
default:
return 0;
}
break;
case DP_TRAIN_PRE_EMPH_LEVEL_3:
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
deemph_reg_value = 43;
margin_reg_value = 154;
break;
default:
return 0;
}
break;
default:
return 0;
}
mutex_lock(&dev_priv->dpio_lock);
/* Clear calc init */
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
val &= ~(DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3);
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);
/* Program swing deemph */
for (i = 0; i < 4; i++) {
val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW4(ch, i));
val &= ~DPIO_SWING_DEEMPH9P5_MASK;
val |= deemph_reg_value << DPIO_SWING_DEEMPH9P5_SHIFT;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW4(ch, i), val);
}
/* Program swing margin */
for (i = 0; i < 4; i++) {
val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
val &= ~DPIO_SWING_MARGIN000_MASK;
val |= margin_reg_value << DPIO_SWING_MARGIN000_SHIFT;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
}
/* Disable unique transition scale */
for (i = 0; i < 4; i++) {
val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
val &= ~DPIO_TX_UNIQ_TRANS_SCALE_EN;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
}
if (((train_set & DP_TRAIN_PRE_EMPHASIS_MASK)
== DP_TRAIN_PRE_EMPH_LEVEL_0) &&
((train_set & DP_TRAIN_VOLTAGE_SWING_MASK)
== DP_TRAIN_VOLTAGE_SWING_LEVEL_3)) {
/*
* The document said it needs to set bit 27 for ch0 and bit 26
* for ch1. Might be a typo in the doc.
* For now, for this unique transition scale selection, set bit
* 27 for ch0 and ch1.
*/
for (i = 0; i < 4; i++) {
val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW3(ch, i));
val |= DPIO_TX_UNIQ_TRANS_SCALE_EN;
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW3(ch, i), val);
}
for (i = 0; i < 4; i++) {
val = vlv_dpio_read(dev_priv, pipe, CHV_TX_DW2(ch, i));
val &= ~(0xff << DPIO_UNIQ_TRANS_SCALE_SHIFT);
val |= (0x9a << DPIO_UNIQ_TRANS_SCALE_SHIFT);
vlv_dpio_write(dev_priv, pipe, CHV_TX_DW2(ch, i), val);
}
}
/* Start swing calculation */
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS01_DW10(ch));
val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
vlv_dpio_write(dev_priv, pipe, VLV_PCS01_DW10(ch), val);
val = vlv_dpio_read(dev_priv, pipe, VLV_PCS23_DW10(ch));
val |= DPIO_PCS_SWING_CALC_TX0_TX2 | DPIO_PCS_SWING_CALC_TX1_TX3;
vlv_dpio_write(dev_priv, pipe, VLV_PCS23_DW10(ch), val);
/* LRC Bypass */
val = vlv_dpio_read(dev_priv, pipe, CHV_CMN_DW30);
val |= DPIO_LRC_BYPASS;
vlv_dpio_write(dev_priv, pipe, CHV_CMN_DW30, val);
mutex_unlock(&dev_priv->dpio_lock);
return 0;
}
static void
intel_get_adjust_train(struct intel_dp *intel_dp,
const uint8_t link_status[DP_LINK_STATUS_SIZE])
{
uint8_t v = 0;
uint8_t p = 0;
int lane;
uint8_t voltage_max;
uint8_t preemph_max;
for (lane = 0; lane < intel_dp->lane_count; lane++) {
uint8_t this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
uint8_t this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
if (this_v > v)
v = this_v;
if (this_p > p)
p = this_p;
}
voltage_max = intel_dp_voltage_max(intel_dp);
if (v >= voltage_max)
v = voltage_max | DP_TRAIN_MAX_SWING_REACHED;
preemph_max = intel_dp_pre_emphasis_max(intel_dp, v);
if (p >= preemph_max)
p = preemph_max | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
for (lane = 0; lane < 4; lane++)
intel_dp->train_set[lane] = v | p;
}
static uint32_t
intel_gen4_signal_levels(uint8_t train_set)
{
uint32_t signal_levels = 0;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0:
default:
signal_levels |= DP_VOLTAGE_0_4;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1:
signal_levels |= DP_VOLTAGE_0_6;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2:
signal_levels |= DP_VOLTAGE_0_8;
break;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3:
signal_levels |= DP_VOLTAGE_1_2;
break;
}
switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
case DP_TRAIN_PRE_EMPH_LEVEL_0:
default:
signal_levels |= DP_PRE_EMPHASIS_0;
break;
case DP_TRAIN_PRE_EMPH_LEVEL_1:
signal_levels |= DP_PRE_EMPHASIS_3_5;
break;
case DP_TRAIN_PRE_EMPH_LEVEL_2:
signal_levels |= DP_PRE_EMPHASIS_6;
break;
case DP_TRAIN_PRE_EMPH_LEVEL_3:
signal_levels |= DP_PRE_EMPHASIS_9_5;
break;
}
return signal_levels;
}
/* Gen6's DP voltage swing and pre-emphasis control */
static uint32_t
intel_gen6_edp_signal_levels(uint8_t train_set)
{
int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
DP_TRAIN_PRE_EMPHASIS_MASK);
switch (signal_levels) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0:
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return EDP_LINK_TRAIN_400MV_3_5DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2:
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2:
return EDP_LINK_TRAIN_400_600MV_6DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1:
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return EDP_LINK_TRAIN_600_800MV_3_5DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0:
case DP_TRAIN_VOLTAGE_SWING_LEVEL_3 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return EDP_LINK_TRAIN_800_1200MV_0DB_SNB_B;
default:
DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
"0x%x\n", signal_levels);
return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B;
}
}
/* Gen7's DP voltage swing and pre-emphasis control */
static uint32_t
intel_gen7_edp_signal_levels(uint8_t train_set)
{
int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
DP_TRAIN_PRE_EMPHASIS_MASK);
switch (signal_levels) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return EDP_LINK_TRAIN_400MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return EDP_LINK_TRAIN_400MV_3_5DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2:
return EDP_LINK_TRAIN_400MV_6DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return EDP_LINK_TRAIN_600MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return EDP_LINK_TRAIN_600MV_3_5DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return EDP_LINK_TRAIN_800MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return EDP_LINK_TRAIN_800MV_3_5DB_IVB;
default:
DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
"0x%x\n", signal_levels);
return EDP_LINK_TRAIN_500MV_0DB_IVB;
}
}
/* Gen7.5's (HSW) DP voltage swing and pre-emphasis control */
static uint32_t
intel_hsw_signal_levels(uint8_t train_set)
{
int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
DP_TRAIN_PRE_EMPHASIS_MASK);
switch (signal_levels) {
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return DDI_BUF_TRANS_SELECT(0);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return DDI_BUF_TRANS_SELECT(1);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2:
return DDI_BUF_TRANS_SELECT(2);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_3:
return DDI_BUF_TRANS_SELECT(3);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return DDI_BUF_TRANS_SELECT(4);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return DDI_BUF_TRANS_SELECT(5);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2:
return DDI_BUF_TRANS_SELECT(6);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0:
return DDI_BUF_TRANS_SELECT(7);
case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1:
return DDI_BUF_TRANS_SELECT(8);
default:
DRM_DEBUG_KMS("Unsupported voltage swing/pre-emphasis level:"
"0x%x\n", signal_levels);
return DDI_BUF_TRANS_SELECT(0);
}
}
/* Properly updates "DP" with the correct signal levels. */
static void
intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum port port = intel_dig_port->port;
struct drm_device *dev = intel_dig_port->base.base.dev;
uint32_t signal_levels, mask;
uint8_t train_set = intel_dp->train_set[0];
if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
signal_levels = intel_hsw_signal_levels(train_set);
mask = DDI_BUF_EMP_MASK;
} else if (IS_CHERRYVIEW(dev)) {
signal_levels = intel_chv_signal_levels(intel_dp);
mask = 0;
} else if (IS_VALLEYVIEW(dev)) {
signal_levels = intel_vlv_signal_levels(intel_dp);
mask = 0;
} else if (IS_GEN7(dev) && port == PORT_A) {
signal_levels = intel_gen7_edp_signal_levels(train_set);
mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB;
} else if (IS_GEN6(dev) && port == PORT_A) {
signal_levels = intel_gen6_edp_signal_levels(train_set);
mask = EDP_LINK_TRAIN_VOL_EMP_MASK_SNB;
} else {
signal_levels = intel_gen4_signal_levels(train_set);
mask = DP_VOLTAGE_MASK | DP_PRE_EMPHASIS_MASK;
}
DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels);
*DP = (*DP & ~mask) | signal_levels;
}
static bool
intel_dp_set_link_train(struct intel_dp *intel_dp,
uint32_t *DP,
uint8_t dp_train_pat)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint8_t buf[sizeof(intel_dp->train_set) + 1];
int ret, len;
_intel_dp_set_link_train(intel_dp, DP, dp_train_pat);
I915_WRITE(intel_dp->output_reg, *DP);
POSTING_READ(intel_dp->output_reg);
buf[0] = dp_train_pat;
if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) ==
DP_TRAINING_PATTERN_DISABLE) {
/* don't write DP_TRAINING_LANEx_SET on disable */
len = 1;
} else {
/* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */
memcpy(buf + 1, intel_dp->train_set, intel_dp->lane_count);
len = intel_dp->lane_count + 1;
}
ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_PATTERN_SET,
buf, len);
return ret == len;
}
static bool
intel_dp_reset_link_train(struct intel_dp *intel_dp, uint32_t *DP,
uint8_t dp_train_pat)
{
memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set));
intel_dp_set_signal_levels(intel_dp, DP);
return intel_dp_set_link_train(intel_dp, DP, dp_train_pat);
}
static bool
intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP,
const uint8_t link_status[DP_LINK_STATUS_SIZE])
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
intel_get_adjust_train(intel_dp, link_status);
intel_dp_set_signal_levels(intel_dp, DP);
I915_WRITE(intel_dp->output_reg, *DP);
POSTING_READ(intel_dp->output_reg);
ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET,
intel_dp->train_set, intel_dp->lane_count);
return ret == intel_dp->lane_count;
}
static void intel_dp_set_idle_link_train(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = intel_dig_port->port;
uint32_t val;
if (!HAS_DDI(dev))
return;
val = I915_READ(DP_TP_CTL(port));
val &= ~DP_TP_CTL_LINK_TRAIN_MASK;
val |= DP_TP_CTL_LINK_TRAIN_IDLE;
I915_WRITE(DP_TP_CTL(port), val);
/*
* On PORT_A we can have only eDP in SST mode. There the only reason
* we need to set idle transmission mode is to work around a HW issue
* where we enable the pipe while not in idle link-training mode.
* In this case there is requirement to wait for a minimum number of
* idle patterns to be sent.
*/
if (port == PORT_A)
return;
if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_IDLE_DONE),
1))
DRM_ERROR("Timed out waiting for DP idle patterns\n");
}
/* Enable corresponding port and start training pattern 1 */
void
intel_dp_start_link_train(struct intel_dp *intel_dp)
{
struct drm_encoder *encoder = &dp_to_dig_port(intel_dp)->base.base;
struct drm_device *dev = encoder->dev;
int i;
uint8_t voltage;
int voltage_tries, loop_tries;
uint32_t DP = intel_dp->DP;
uint8_t link_config[2];
if (HAS_DDI(dev))
intel_ddi_prepare_link_retrain(encoder);
/* Write the link configuration data */
link_config[0] = intel_dp->link_bw;
link_config[1] = intel_dp->lane_count;
if (drm_dp_enhanced_frame_cap(intel_dp->dpcd))
link_config[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
drm_dp_dpcd_write(&intel_dp->aux, DP_LINK_BW_SET, link_config, 2);
link_config[0] = 0;
link_config[1] = DP_SET_ANSI_8B10B;
drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2);
DP |= DP_PORT_EN;
/* clock recovery */
if (!intel_dp_reset_link_train(intel_dp, &DP,
DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE)) {
DRM_ERROR("failed to enable link training\n");
return;
}
voltage = 0xff;
voltage_tries = 0;
loop_tries = 0;
for (;;) {
uint8_t link_status[DP_LINK_STATUS_SIZE];
drm_dp_link_train_clock_recovery_delay(intel_dp->dpcd);
if (!intel_dp_get_link_status(intel_dp, link_status)) {
DRM_ERROR("failed to get link status\n");
break;
}
if (drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) {
DRM_DEBUG_KMS("clock recovery OK\n");
break;
}
/* Check to see if we've tried the max voltage */
for (i = 0; i < intel_dp->lane_count; i++)
if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
break;
if (i == intel_dp->lane_count) {
++loop_tries;
if (loop_tries == 5) {
DRM_ERROR("too many full retries, give up\n");
break;
}
intel_dp_reset_link_train(intel_dp, &DP,
DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE);
voltage_tries = 0;
continue;
}
/* Check to see if we've tried the same voltage 5 times */
if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
++voltage_tries;
if (voltage_tries == 5) {
DRM_ERROR("too many voltage retries, give up\n");
break;
}
} else
voltage_tries = 0;
voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
/* Update training set as requested by target */
if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) {
DRM_ERROR("failed to update link training\n");
break;
}
}
intel_dp->DP = DP;
}
void
intel_dp_complete_link_train(struct intel_dp *intel_dp)
{
bool channel_eq = false;
int tries, cr_tries;
uint32_t DP = intel_dp->DP;
uint32_t training_pattern = DP_TRAINING_PATTERN_2;
/* Training Pattern 3 for HBR2 ot 1.2 devices that support it*/
if (intel_dp->link_bw == DP_LINK_BW_5_4 || intel_dp->use_tps3)
training_pattern = DP_TRAINING_PATTERN_3;
/* channel equalization */
if (!intel_dp_set_link_train(intel_dp, &DP,
training_pattern |
DP_LINK_SCRAMBLING_DISABLE)) {
DRM_ERROR("failed to start channel equalization\n");
return;
}
tries = 0;
cr_tries = 0;
channel_eq = false;
for (;;) {
uint8_t link_status[DP_LINK_STATUS_SIZE];
if (cr_tries > 5) {
DRM_ERROR("failed to train DP, aborting\n");
break;
}
drm_dp_link_train_channel_eq_delay(intel_dp->dpcd);
if (!intel_dp_get_link_status(intel_dp, link_status)) {
DRM_ERROR("failed to get link status\n");
break;
}
/* Make sure clock is still ok */
if (!drm_dp_clock_recovery_ok(link_status, intel_dp->lane_count)) {
intel_dp_start_link_train(intel_dp);
intel_dp_set_link_train(intel_dp, &DP,
training_pattern |
DP_LINK_SCRAMBLING_DISABLE);
cr_tries++;
continue;
}
if (drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
channel_eq = true;
break;
}
/* Try 5 times, then try clock recovery if that fails */
if (tries > 5) {
intel_dp_link_down(intel_dp);
intel_dp_start_link_train(intel_dp);
intel_dp_set_link_train(intel_dp, &DP,
training_pattern |
DP_LINK_SCRAMBLING_DISABLE);
tries = 0;
cr_tries++;
continue;
}
/* Update training set as requested by target */
if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) {
DRM_ERROR("failed to update link training\n");
break;
}
++tries;
}
intel_dp_set_idle_link_train(intel_dp);
intel_dp->DP = DP;
if (channel_eq)
DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n");
}
void intel_dp_stop_link_train(struct intel_dp *intel_dp)
{
intel_dp_set_link_train(intel_dp, &intel_dp->DP,
DP_TRAINING_PATTERN_DISABLE);
}
static void
intel_dp_link_down(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
enum port port = intel_dig_port->port;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc =
to_intel_crtc(intel_dig_port->base.base.crtc);
uint32_t DP = intel_dp->DP;
if (WARN_ON(HAS_DDI(dev)))
return;
if (WARN_ON((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0))
return;
DRM_DEBUG_KMS("\n");
if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || port != PORT_A)) {
DP &= ~DP_LINK_TRAIN_MASK_CPT;
I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT);
} else {
if (IS_CHERRYVIEW(dev))
DP &= ~DP_LINK_TRAIN_MASK_CHV;
else
DP &= ~DP_LINK_TRAIN_MASK;
I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
}
POSTING_READ(intel_dp->output_reg);
if (HAS_PCH_IBX(dev) &&
I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
/* Hardware workaround: leaving our transcoder select
* set to transcoder B while it's off will prevent the
* corresponding HDMI output on transcoder A.
*
* Combine this with another hardware workaround:
* transcoder select bit can only be cleared while the
* port is enabled.
*/
DP &= ~DP_PIPEB_SELECT;
I915_WRITE(intel_dp->output_reg, DP);
/* Changes to enable or select take place the vblank
* after being written.
*/
if (WARN_ON(crtc == NULL)) {
/* We should never try to disable a port without a crtc
* attached. For paranoia keep the code around for a
* bit. */
POSTING_READ(intel_dp->output_reg);
msleep(50);
} else
intel_wait_for_vblank(dev, intel_crtc->pipe);
}
DP &= ~DP_AUDIO_OUTPUT_ENABLE;
I915_WRITE(intel_dp->output_reg, DP & ~DP_PORT_EN);
POSTING_READ(intel_dp->output_reg);
msleep(intel_dp->panel_power_down_delay);
}
static bool
intel_dp_get_dpcd(struct intel_dp *intel_dp)
{
struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (intel_dp_dpcd_read_wake(&intel_dp->aux, 0x000, intel_dp->dpcd,
sizeof(intel_dp->dpcd)) < 0)
return false; /* aux transfer failed */
DRM_DEBUG_KMS("DPCD: %*ph\n", (int) sizeof(intel_dp->dpcd), intel_dp->dpcd);
if (intel_dp->dpcd[DP_DPCD_REV] == 0)
return false; /* DPCD not present */
/* Check if the panel supports PSR */
memset(intel_dp->psr_dpcd, 0, sizeof(intel_dp->psr_dpcd));
if (is_edp(intel_dp)) {
intel_dp_dpcd_read_wake(&intel_dp->aux, DP_PSR_SUPPORT,
intel_dp->psr_dpcd,
sizeof(intel_dp->psr_dpcd));
if (intel_dp->psr_dpcd[0] & DP_PSR_IS_SUPPORTED) {
dev_priv->psr.sink_support = true;
DRM_DEBUG_KMS("Detected EDP PSR Panel.\n");
}
}
/* Training Pattern 3 support */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x12 &&
intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) {
intel_dp->use_tps3 = true;
DRM_DEBUG_KMS("Displayport TPS3 supported\n");
} else
intel_dp->use_tps3 = false;
if (!(intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
DP_DWN_STRM_PORT_PRESENT))
return true; /* native DP sink */
if (intel_dp->dpcd[DP_DPCD_REV] == 0x10)
return true; /* no per-port downstream info */
if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_DOWNSTREAM_PORT_0,
intel_dp->downstream_ports,
DP_MAX_DOWNSTREAM_PORTS) < 0)
return false; /* downstream port status fetch failed */
return true;
}
static void
intel_dp_probe_oui(struct intel_dp *intel_dp)
{
u8 buf[3];
if (!(intel_dp->dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
return;
intel_edp_panel_vdd_on(intel_dp);
if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_OUI, buf, 3) == 3)
DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
buf[0], buf[1], buf[2]);
if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_BRANCH_OUI, buf, 3) == 3)
DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
buf[0], buf[1], buf[2]);
intel_edp_panel_vdd_off(intel_dp, false);
}
static bool
intel_dp_probe_mst(struct intel_dp *intel_dp)
{
u8 buf[1];
if (!intel_dp->can_mst)
return false;
if (intel_dp->dpcd[DP_DPCD_REV] < 0x12)
return false;
intel_edp_panel_vdd_on(intel_dp);
if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_MSTM_CAP, buf, 1)) {
if (buf[0] & DP_MST_CAP) {
DRM_DEBUG_KMS("Sink is MST capable\n");
intel_dp->is_mst = true;
} else {
DRM_DEBUG_KMS("Sink is not MST capable\n");
intel_dp->is_mst = false;
}
}
intel_edp_panel_vdd_off(intel_dp, false);
drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
return intel_dp->is_mst;
}
int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct drm_device *dev = intel_dig_port->base.base.dev;
struct intel_crtc *intel_crtc =
to_intel_crtc(intel_dig_port->base.base.crtc);
u8 buf[1];
if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, buf) < 0)
return -EIO;
if (!(buf[0] & DP_TEST_CRC_SUPPORTED))
return -ENOTTY;
if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK,
DP_TEST_SINK_START) < 0)
return -EIO;
/* Wait 2 vblanks to be sure we will have the correct CRC value */
intel_wait_for_vblank(dev, intel_crtc->pipe);
intel_wait_for_vblank(dev, intel_crtc->pipe);
if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0)
return -EIO;
drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_SINK, 0);
return 0;
}
static bool
intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
return intel_dp_dpcd_read_wake(&intel_dp->aux,
DP_DEVICE_SERVICE_IRQ_VECTOR,
sink_irq_vector, 1) == 1;
}
static bool
intel_dp_get_sink_irq_esi(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
int ret;
ret = intel_dp_dpcd_read_wake(&intel_dp->aux,
DP_SINK_COUNT_ESI,
sink_irq_vector, 14);
if (ret != 14)
return false;
return true;
}
static void
intel_dp_handle_test_request(struct intel_dp *intel_dp)
{
/* NAK by default */
drm_dp_dpcd_writeb(&intel_dp->aux, DP_TEST_RESPONSE, DP_TEST_NAK);
}
static int
intel_dp_check_mst_status(struct intel_dp *intel_dp)
{
bool bret;
if (intel_dp->is_mst) {
u8 esi[16] = { 0 };
int ret = 0;
int retry;
bool handled;
bret = intel_dp_get_sink_irq_esi(intel_dp, esi);
go_again:
if (bret == true) {
/* check link status - esi[10] = 0x200c */
if (intel_dp->active_mst_links && !drm_dp_channel_eq_ok(&esi[10], intel_dp->lane_count)) {
DRM_DEBUG_KMS("channel EQ not ok, retraining\n");
intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp);
intel_dp_stop_link_train(intel_dp);
}
DRM_DEBUG_KMS("got esi %02x %02x %02x\n", esi[0], esi[1], esi[2]);
ret = drm_dp_mst_hpd_irq(&intel_dp->mst_mgr, esi, &handled);
if (handled) {
for (retry = 0; retry < 3; retry++) {
int wret;
wret = drm_dp_dpcd_write(&intel_dp->aux,
DP_SINK_COUNT_ESI+1,
&esi[1], 3);
if (wret == 3) {
break;
}
}
bret = intel_dp_get_sink_irq_esi(intel_dp, esi);
if (bret == true) {
DRM_DEBUG_KMS("got esi2 %02x %02x %02x\n", esi[0], esi[1], esi[2]);
goto go_again;
}
} else
ret = 0;
return ret;
} else {
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
DRM_DEBUG_KMS("failed to get ESI - device may have failed\n");
intel_dp->is_mst = false;
drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
/* send a hotplug event */
drm_kms_helper_hotplug_event(intel_dig_port->base.base.dev);
}
}
return -EINVAL;
}
/*
* According to DP spec
* 5.1.2:
* 1. Read DPCD
* 2. Configure link according to Receiver Capabilities
* 3. Use Link Training from 2.5.3.3 and 3.5.1.3
* 4. Check link status on receipt of hot-plug interrupt
*/
void
intel_dp_check_link_status(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
u8 sink_irq_vector;
u8 link_status[DP_LINK_STATUS_SIZE];
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
if (!intel_encoder->connectors_active)
return;
if (WARN_ON(!intel_encoder->base.crtc))
return;
if (!to_intel_crtc(intel_encoder->base.crtc)->active)
return;
/* Try to read receiver status if the link appears to be up */
if (!intel_dp_get_link_status(intel_dp, link_status)) {
return;
}
/* Now read the DPCD to see if it's actually running */
if (!intel_dp_get_dpcd(intel_dp)) {
return;
}
/* Try to read the source of the interrupt */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
intel_dp_get_sink_irq(intel_dp, &sink_irq_vector)) {
/* Clear interrupt source */
drm_dp_dpcd_writeb(&intel_dp->aux,
DP_DEVICE_SERVICE_IRQ_VECTOR,
sink_irq_vector);
if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
intel_dp_handle_test_request(intel_dp);
if (sink_irq_vector & (DP_CP_IRQ | DP_SINK_SPECIFIC_IRQ))
DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
}
if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
intel_encoder->base.name);
intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp);
intel_dp_stop_link_train(intel_dp);
}
}
/* XXX this is probably wrong for multiple downstream ports */
static enum drm_connector_status
intel_dp_detect_dpcd(struct intel_dp *intel_dp)
{
uint8_t *dpcd = intel_dp->dpcd;
uint8_t type;
if (!intel_dp_get_dpcd(intel_dp))
return connector_status_disconnected;
/* if there's no downstream port, we're done */
if (!(dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT))
return connector_status_connected;
/* If we're HPD-aware, SINK_COUNT changes dynamically */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
intel_dp->downstream_ports[0] & DP_DS_PORT_HPD) {
uint8_t reg;
if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_SINK_COUNT,
&reg, 1) < 0)
return connector_status_unknown;
return DP_GET_SINK_COUNT(reg) ? connector_status_connected
: connector_status_disconnected;
}
/* If no HPD, poke DDC gently */
if (drm_probe_ddc(&intel_dp->aux.ddc))
return connector_status_connected;
/* Well we tried, say unknown for unreliable port types */
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11) {
type = intel_dp->downstream_ports[0] & DP_DS_PORT_TYPE_MASK;
if (type == DP_DS_PORT_TYPE_VGA ||
type == DP_DS_PORT_TYPE_NON_EDID)
return connector_status_unknown;
} else {
type = intel_dp->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
DP_DWN_STRM_PORT_TYPE_MASK;
if (type == DP_DWN_STRM_PORT_TYPE_ANALOG ||
type == DP_DWN_STRM_PORT_TYPE_OTHER)
return connector_status_unknown;
}
/* Anything else is out of spec, warn and ignore */
DRM_DEBUG_KMS("Broken DP branch device, ignoring\n");
return connector_status_disconnected;
}
static enum drm_connector_status
edp_detect(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
enum drm_connector_status status;
status = intel_panel_detect(dev);
if (status == connector_status_unknown)
status = connector_status_connected;
return status;
}
static enum drm_connector_status
ironlake_dp_detect(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
return connector_status_disconnected;
return intel_dp_detect_dpcd(intel_dp);
}
static int g4x_digital_port_connected(struct drm_device *dev,
struct intel_digital_port *intel_dig_port)
{
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t bit;
if (IS_VALLEYVIEW(dev)) {
switch (intel_dig_port->port) {
case PORT_B:
bit = PORTB_HOTPLUG_LIVE_STATUS_VLV;
break;
case PORT_C:
bit = PORTC_HOTPLUG_LIVE_STATUS_VLV;
break;
case PORT_D:
bit = PORTD_HOTPLUG_LIVE_STATUS_VLV;
break;
default:
return -EINVAL;
}
} else {
switch (intel_dig_port->port) {
case PORT_B:
bit = PORTB_HOTPLUG_LIVE_STATUS_G4X;
break;
case PORT_C:
bit = PORTC_HOTPLUG_LIVE_STATUS_G4X;
break;
case PORT_D:
bit = PORTD_HOTPLUG_LIVE_STATUS_G4X;
break;
default:
return -EINVAL;
}
}
if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
return 0;
return 1;
}
static enum drm_connector_status
g4x_dp_detect(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
int ret;
/* Can't disconnect eDP, but you can close the lid... */
if (is_edp(intel_dp)) {
enum drm_connector_status status;
status = intel_panel_detect(dev);
if (status == connector_status_unknown)
status = connector_status_connected;
return status;
}
ret = g4x_digital_port_connected(dev, intel_dig_port);
if (ret == -EINVAL)
return connector_status_unknown;
else if (ret == 0)
return connector_status_disconnected;
return intel_dp_detect_dpcd(intel_dp);
}
static struct edid *
intel_dp_get_edid(struct intel_dp *intel_dp)
{
struct intel_connector *intel_connector = intel_dp->attached_connector;
/* use cached edid if we have one */
if (intel_connector->edid) {
/* invalid edid */
if (IS_ERR(intel_connector->edid))
return NULL;
return drm_edid_duplicate(intel_connector->edid);
} else
return drm_get_edid(&intel_connector->base,
&intel_dp->aux.ddc);
}
static void
intel_dp_set_edid(struct intel_dp *intel_dp)
{
struct intel_connector *intel_connector = intel_dp->attached_connector;
struct edid *edid;
edid = intel_dp_get_edid(intel_dp);
intel_connector->detect_edid = edid;
if (intel_dp->force_audio != HDMI_AUDIO_AUTO)
intel_dp->has_audio = intel_dp->force_audio == HDMI_AUDIO_ON;
else
intel_dp->has_audio = drm_detect_monitor_audio(edid);
}
static void
intel_dp_unset_edid(struct intel_dp *intel_dp)
{
struct intel_connector *intel_connector = intel_dp->attached_connector;
kfree(intel_connector->detect_edid);
intel_connector->detect_edid = NULL;
intel_dp->has_audio = false;
}
static enum intel_display_power_domain
intel_dp_power_get(struct intel_dp *dp)
{
struct intel_encoder *encoder = &dp_to_dig_port(dp)->base;
enum intel_display_power_domain power_domain;
power_domain = intel_display_port_power_domain(encoder);
intel_display_power_get(to_i915(encoder->base.dev), power_domain);
return power_domain;
}
static void
intel_dp_power_put(struct intel_dp *dp,
enum intel_display_power_domain power_domain)
{
struct intel_encoder *encoder = &dp_to_dig_port(dp)->base;
intel_display_power_put(to_i915(encoder->base.dev), power_domain);
}
static enum drm_connector_status
intel_dp_detect(struct drm_connector *connector, bool force)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = connector->dev;
enum drm_connector_status status;
enum intel_display_power_domain power_domain;
bool ret;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
intel_dp_unset_edid(intel_dp);
if (intel_dp->is_mst) {
/* MST devices are disconnected from a monitor POV */
if (intel_encoder->type != INTEL_OUTPUT_EDP)
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
return connector_status_disconnected;
}
power_domain = intel_dp_power_get(intel_dp);
/* Can't disconnect eDP, but you can close the lid... */
if (is_edp(intel_dp))
status = edp_detect(intel_dp);
else if (HAS_PCH_SPLIT(dev))
status = ironlake_dp_detect(intel_dp);
else
status = g4x_dp_detect(intel_dp);
if (status != connector_status_connected)
goto out;
intel_dp_probe_oui(intel_dp);
ret = intel_dp_probe_mst(intel_dp);
if (ret) {
/* if we are in MST mode then this connector
won't appear connected or have anything with EDID on it */
if (intel_encoder->type != INTEL_OUTPUT_EDP)
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
status = connector_status_disconnected;
goto out;
}
intel_dp_set_edid(intel_dp);
if (intel_encoder->type != INTEL_OUTPUT_EDP)
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
status = connector_status_connected;
out:
intel_dp_power_put(intel_dp, power_domain);
return status;
}
static void
intel_dp_force(struct drm_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct intel_encoder *intel_encoder = &dp_to_dig_port(intel_dp)->base;
enum intel_display_power_domain power_domain;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
connector->base.id, connector->name);
intel_dp_unset_edid(intel_dp);
if (connector->status != connector_status_connected)
return;
power_domain = intel_dp_power_get(intel_dp);
intel_dp_set_edid(intel_dp);
intel_dp_power_put(intel_dp, power_domain);
if (intel_encoder->type != INTEL_OUTPUT_EDP)
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
}
static int intel_dp_get_modes(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct edid *edid;
edid = intel_connector->detect_edid;
if (edid) {
int ret = intel_connector_update_modes(connector, edid);
if (ret)
return ret;
}
/* if eDP has no EDID, fall back to fixed mode */
if (is_edp(intel_attached_dp(connector)) &&
intel_connector->panel.fixed_mode) {
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev,
intel_connector->panel.fixed_mode);
if (mode) {
drm_mode_probed_add(connector, mode);
return 1;
}
}
return 0;
}
static bool
intel_dp_detect_audio(struct drm_connector *connector)
{
bool has_audio = false;
struct edid *edid;
edid = to_intel_connector(connector)->detect_edid;
if (edid)
has_audio = drm_detect_monitor_audio(edid);
return has_audio;
}
static int
intel_dp_set_property(struct drm_connector *connector,
struct drm_property *property,
uint64_t val)
{
struct drm_i915_private *dev_priv = connector->dev->dev_private;
struct intel_connector *intel_connector = to_intel_connector(connector);
struct intel_encoder *intel_encoder = intel_attached_encoder(connector);
struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
int ret;
ret = drm_object_property_set_value(&connector->base, property, val);
if (ret)
return ret;
if (property == dev_priv->force_audio_property) {
int i = val;
bool has_audio;
if (i == intel_dp->force_audio)
return 0;
intel_dp->force_audio = i;
if (i == HDMI_AUDIO_AUTO)
has_audio = intel_dp_detect_audio(connector);
else
has_audio = (i == HDMI_AUDIO_ON);
if (has_audio == intel_dp->has_audio)
return 0;
intel_dp->has_audio = has_audio;
goto done;
}
if (property == dev_priv->broadcast_rgb_property) {
bool old_auto = intel_dp->color_range_auto;
uint32_t old_range = intel_dp->color_range;
switch (val) {
case INTEL_BROADCAST_RGB_AUTO:
intel_dp->color_range_auto = true;
break;
case INTEL_BROADCAST_RGB_FULL:
intel_dp->color_range_auto = false;
intel_dp->color_range = 0;
break;
case INTEL_BROADCAST_RGB_LIMITED:
intel_dp->color_range_auto = false;
intel_dp->color_range = DP_COLOR_RANGE_16_235;
break;
default:
return -EINVAL;
}
if (old_auto == intel_dp->color_range_auto &&
old_range == intel_dp->color_range)
return 0;
goto done;
}
if (is_edp(intel_dp) &&
property == connector->dev->mode_config.scaling_mode_property) {
if (val == DRM_MODE_SCALE_NONE) {
DRM_DEBUG_KMS("no scaling not supported\n");
return -EINVAL;
}
if (intel_connector->panel.fitting_mode == val) {
/* the eDP scaling property is not changed */
return 0;
}
intel_connector->panel.fitting_mode = val;
goto done;
}
return -EINVAL;
done:
if (intel_encoder->base.crtc)
intel_crtc_restore_mode(intel_encoder->base.crtc);
return 0;
}
static void
intel_dp_connector_destroy(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
kfree(intel_connector->detect_edid);
if (!IS_ERR_OR_NULL(intel_connector->edid))
kfree(intel_connector->edid);
/* Can't call is_edp() since the encoder may have been destroyed
* already. */
if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
intel_panel_fini(&intel_connector->panel);
drm_connector_cleanup(connector);
kfree(connector);
}
void intel_dp_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
struct intel_dp *intel_dp = &intel_dig_port->dp;
drm_dp_aux_unregister(&intel_dp->aux);
intel_dp_mst_encoder_cleanup(intel_dig_port);
drm_encoder_cleanup(encoder);
if (is_edp(intel_dp)) {
cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
/*
* vdd might still be enabled do to the delayed vdd off.
* Make sure vdd is actually turned off here.
*/
pps_lock(intel_dp);
edp_panel_vdd_off_sync(intel_dp);
pps_unlock(intel_dp);
if (intel_dp->edp_notifier.notifier_call) {
unregister_reboot_notifier(&intel_dp->edp_notifier);
intel_dp->edp_notifier.notifier_call = NULL;
}
}
kfree(intel_dig_port);
}
static void intel_dp_encoder_suspend(struct intel_encoder *intel_encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&intel_encoder->base);
if (!is_edp(intel_dp))
return;
/*
* vdd might still be enabled do to the delayed vdd off.
* Make sure vdd is actually turned off here.
*/
pps_lock(intel_dp);
edp_panel_vdd_off_sync(intel_dp);
pps_unlock(intel_dp);
}
static void intel_dp_encoder_reset(struct drm_encoder *encoder)
{
intel_edp_panel_vdd_sanitize(to_intel_encoder(encoder));
}
static const struct drm_connector_funcs intel_dp_connector_funcs = {
.dpms = intel_connector_dpms,
.detect = intel_dp_detect,
.force = intel_dp_force,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = intel_dp_set_property,
.destroy = intel_dp_connector_destroy,
};
static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs = {
.get_modes = intel_dp_get_modes,
.mode_valid = intel_dp_mode_valid,
.best_encoder = intel_best_encoder,
};
static const struct drm_encoder_funcs intel_dp_enc_funcs = {
.reset = intel_dp_encoder_reset,
.destroy = intel_dp_encoder_destroy,
};
void
intel_dp_hot_plug(struct intel_encoder *intel_encoder)
{
return;
}
bool
intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
{
struct intel_dp *intel_dp = &intel_dig_port->dp;
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum intel_display_power_domain power_domain;
bool ret = true;
if (intel_dig_port->base.type != INTEL_OUTPUT_EDP)
intel_dig_port->base.type = INTEL_OUTPUT_DISPLAYPORT;
if (long_hpd && intel_dig_port->base.type == INTEL_OUTPUT_EDP) {
/*
* vdd off can generate a long pulse on eDP which
* would require vdd on to handle it, and thus we
* would end up in an endless cycle of
* "vdd off -> long hpd -> vdd on -> detect -> vdd off -> ..."
*/
DRM_DEBUG_KMS("ignoring long hpd on eDP port %c\n",
port_name(intel_dig_port->port));
return false;
}
DRM_DEBUG_KMS("got hpd irq on port %c - %s\n",
port_name(intel_dig_port->port),
long_hpd ? "long" : "short");
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_get(dev_priv, power_domain);
if (long_hpd) {
if (HAS_PCH_SPLIT(dev)) {
if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
goto mst_fail;
} else {
if (g4x_digital_port_connected(dev, intel_dig_port) != 1)
goto mst_fail;
}
if (!intel_dp_get_dpcd(intel_dp)) {
goto mst_fail;
}
intel_dp_probe_oui(intel_dp);
if (!intel_dp_probe_mst(intel_dp))
goto mst_fail;
} else {
if (intel_dp->is_mst) {
if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
goto mst_fail;
}
if (!intel_dp->is_mst) {
/*
* we'll check the link status via the normal hot plug path later -
* but for short hpds we should check it now
*/
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
intel_dp_check_link_status(intel_dp);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
}
}
ret = false;
goto put_power;
mst_fail:
/* if we were in MST mode, and device is not there get out of MST mode */
if (intel_dp->is_mst) {
DRM_DEBUG_KMS("MST device may have disappeared %d vs %d\n", intel_dp->is_mst, intel_dp->mst_mgr.mst_state);
intel_dp->is_mst = false;
drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
}
put_power:
intel_display_power_put(dev_priv, power_domain);
return ret;
}
/* Return which DP Port should be selected for Transcoder DP control */
int
intel_trans_dp_port_sel(struct drm_crtc *crtc)
{
struct drm_device *dev = crtc->dev;
struct intel_encoder *intel_encoder;
struct intel_dp *intel_dp;
for_each_encoder_on_crtc(dev, crtc, intel_encoder) {
intel_dp = enc_to_intel_dp(&intel_encoder->base);
if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT ||
intel_encoder->type == INTEL_OUTPUT_EDP)
return intel_dp->output_reg;
}
return -1;
}
/* check the VBT to see whether the eDP is on DP-D port */
bool intel_dp_is_edp(struct drm_device *dev, enum port port)
{
struct drm_i915_private *dev_priv = dev->dev_private;
union child_device_config *p_child;
int i;
static const short port_mapping[] = {
[PORT_B] = PORT_IDPB,
[PORT_C] = PORT_IDPC,
[PORT_D] = PORT_IDPD,
};
if (port == PORT_A)
return true;
if (!dev_priv->vbt.child_dev_num)
return false;
for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
p_child = dev_priv->vbt.child_dev + i;
if (p_child->common.dvo_port == port_mapping[port] &&
(p_child->common.device_type & DEVICE_TYPE_eDP_BITS) ==
(DEVICE_TYPE_eDP & DEVICE_TYPE_eDP_BITS))
return true;
}
return false;
}
void
intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
intel_attach_force_audio_property(connector);
intel_attach_broadcast_rgb_property(connector);
intel_dp->color_range_auto = true;
if (is_edp(intel_dp)) {
drm_mode_create_scaling_mode_property(connector->dev);
drm_object_attach_property(
&connector->base,
connector->dev->mode_config.scaling_mode_property,
DRM_MODE_SCALE_ASPECT);
intel_connector->panel.fitting_mode = DRM_MODE_SCALE_ASPECT;
}
}
static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
{
intel_dp->last_power_cycle = jiffies;
intel_dp->last_power_on = jiffies;
intel_dp->last_backlight_off = jiffies;
}
static void
intel_dp_init_panel_power_sequencer(struct drm_device *dev,
struct intel_dp *intel_dp,
struct edp_power_seq *out)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct edp_power_seq cur, vbt, spec, final;
u32 pp_on, pp_off, pp_div, pp;
int pp_ctrl_reg, pp_on_reg, pp_off_reg, pp_div_reg;
lockdep_assert_held(&dev_priv->pps_mutex);
if (HAS_PCH_SPLIT(dev)) {
pp_ctrl_reg = PCH_PP_CONTROL;
pp_on_reg = PCH_PP_ON_DELAYS;
pp_off_reg = PCH_PP_OFF_DELAYS;
pp_div_reg = PCH_PP_DIVISOR;
} else {
enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe);
pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe);
pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe);
pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
}
/* Workaround: Need to write PP_CONTROL with the unlock key as
* the very first thing. */
pp = ironlake_get_pp_control(intel_dp);
I915_WRITE(pp_ctrl_reg, pp);
pp_on = I915_READ(pp_on_reg);
pp_off = I915_READ(pp_off_reg);
pp_div = I915_READ(pp_div_reg);
/* Pull timing values out of registers */
cur.t1_t3 = (pp_on & PANEL_POWER_UP_DELAY_MASK) >>
PANEL_POWER_UP_DELAY_SHIFT;
cur.t8 = (pp_on & PANEL_LIGHT_ON_DELAY_MASK) >>
PANEL_LIGHT_ON_DELAY_SHIFT;
cur.t9 = (pp_off & PANEL_LIGHT_OFF_DELAY_MASK) >>
PANEL_LIGHT_OFF_DELAY_SHIFT;
cur.t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >>
PANEL_POWER_DOWN_DELAY_SHIFT;
cur.t11_t12 = ((pp_div & PANEL_POWER_CYCLE_DELAY_MASK) >>
PANEL_POWER_CYCLE_DELAY_SHIFT) * 1000;
DRM_DEBUG_KMS("cur t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
cur.t1_t3, cur.t8, cur.t9, cur.t10, cur.t11_t12);
vbt = dev_priv->vbt.edp_pps;
/* Upper limits from eDP 1.3 spec. Note that we use the clunky units of
* our hw here, which are all in 100usec. */
spec.t1_t3 = 210 * 10;
spec.t8 = 50 * 10; /* no limit for t8, use t7 instead */
spec.t9 = 50 * 10; /* no limit for t9, make it symmetric with t8 */
spec.t10 = 500 * 10;
/* This one is special and actually in units of 100ms, but zero
* based in the hw (so we need to add 100 ms). But the sw vbt
* table multiplies it with 1000 to make it in units of 100usec,
* too. */
spec.t11_t12 = (510 + 100) * 10;
DRM_DEBUG_KMS("vbt t1_t3 %d t8 %d t9 %d t10 %d t11_t12 %d\n",
vbt.t1_t3, vbt.t8, vbt.t9, vbt.t10, vbt.t11_t12);
/* Use the max of the register settings and vbt. If both are
* unset, fall back to the spec limits. */
#define assign_final(field) final.field = (max(cur.field, vbt.field) == 0 ? \
spec.field : \
max(cur.field, vbt.field))
assign_final(t1_t3);
assign_final(t8);
assign_final(t9);
assign_final(t10);
assign_final(t11_t12);
#undef assign_final
#define get_delay(field) (DIV_ROUND_UP(final.field, 10))
intel_dp->panel_power_up_delay = get_delay(t1_t3);
intel_dp->backlight_on_delay = get_delay(t8);
intel_dp->backlight_off_delay = get_delay(t9);
intel_dp->panel_power_down_delay = get_delay(t10);
intel_dp->panel_power_cycle_delay = get_delay(t11_t12);
#undef get_delay
DRM_DEBUG_KMS("panel power up delay %d, power down delay %d, power cycle delay %d\n",
intel_dp->panel_power_up_delay, intel_dp->panel_power_down_delay,
intel_dp->panel_power_cycle_delay);
DRM_DEBUG_KMS("backlight on delay %d, off delay %d\n",
intel_dp->backlight_on_delay, intel_dp->backlight_off_delay);
if (out)
*out = final;
}
static void
intel_dp_init_panel_power_sequencer_registers(struct drm_device *dev,
struct intel_dp *intel_dp,
struct edp_power_seq *seq)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp_on, pp_off, pp_div, port_sel = 0;
int div = HAS_PCH_SPLIT(dev) ? intel_pch_rawclk(dev) : intel_hrawclk(dev);
int pp_on_reg, pp_off_reg, pp_div_reg;
enum port port = dp_to_dig_port(intel_dp)->port;
lockdep_assert_held(&dev_priv->pps_mutex);
if (HAS_PCH_SPLIT(dev)) {
pp_on_reg = PCH_PP_ON_DELAYS;
pp_off_reg = PCH_PP_OFF_DELAYS;
pp_div_reg = PCH_PP_DIVISOR;
} else {
enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
pp_on_reg = VLV_PIPE_PP_ON_DELAYS(pipe);
pp_off_reg = VLV_PIPE_PP_OFF_DELAYS(pipe);
pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
}
/*
* And finally store the new values in the power sequencer. The
* backlight delays are set to 1 because we do manual waits on them. For
* T8, even BSpec recommends doing it. For T9, if we don't do this,
* we'll end up waiting for the backlight off delay twice: once when we
* do the manual sleep, and once when we disable the panel and wait for
* the PP_STATUS bit to become zero.
*/
pp_on = (seq->t1_t3 << PANEL_POWER_UP_DELAY_SHIFT) |
(1 << PANEL_LIGHT_ON_DELAY_SHIFT);
pp_off = (1 << PANEL_LIGHT_OFF_DELAY_SHIFT) |
(seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT);
/* Compute the divisor for the pp clock, simply match the Bspec
* formula. */
pp_div = ((100 * div)/2 - 1) << PP_REFERENCE_DIVIDER_SHIFT;
pp_div |= (DIV_ROUND_UP(seq->t11_t12, 1000)
<< PANEL_POWER_CYCLE_DELAY_SHIFT);
/* Haswell doesn't have any port selection bits for the panel
* power sequencer any more. */
if (IS_VALLEYVIEW(dev)) {
port_sel = PANEL_PORT_SELECT_VLV(port);
} else if (HAS_PCH_IBX(dev) || HAS_PCH_CPT(dev)) {
if (port == PORT_A)
port_sel = PANEL_PORT_SELECT_DPA;
else
port_sel = PANEL_PORT_SELECT_DPD;
}
pp_on |= port_sel;
I915_WRITE(pp_on_reg, pp_on);
I915_WRITE(pp_off_reg, pp_off);
I915_WRITE(pp_div_reg, pp_div);
DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
I915_READ(pp_on_reg),
I915_READ(pp_off_reg),
I915_READ(pp_div_reg));
}
void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_encoder *encoder;
struct intel_dp *intel_dp = NULL;
struct intel_crtc_config *config = NULL;
struct intel_crtc *intel_crtc = NULL;
struct intel_connector *intel_connector = dev_priv->drrs.connector;
u32 reg, val;
enum edp_drrs_refresh_rate_type index = DRRS_HIGH_RR;
if (refresh_rate <= 0) {
DRM_DEBUG_KMS("Refresh rate should be positive non-zero.\n");
return;
}
if (intel_connector == NULL) {
DRM_DEBUG_KMS("DRRS supported for eDP only.\n");
return;
}
/*
* FIXME: This needs proper synchronization with psr state. But really
* hard to tell without seeing the user of this function of this code.
* Check locking and ordering once that lands.
*/
if (INTEL_INFO(dev)->gen < 8 && intel_edp_is_psr_enabled(dev)) {
DRM_DEBUG_KMS("DRRS is disabled as PSR is enabled\n");
return;
}
encoder = intel_attached_encoder(&intel_connector->base);
intel_dp = enc_to_intel_dp(&encoder->base);
intel_crtc = encoder->new_crtc;
if (!intel_crtc) {
DRM_DEBUG_KMS("DRRS: intel_crtc not initialized\n");
return;
}
config = &intel_crtc->config;
if (intel_dp->drrs_state.type < SEAMLESS_DRRS_SUPPORT) {
DRM_DEBUG_KMS("Only Seamless DRRS supported.\n");
return;
}
if (intel_connector->panel.downclock_mode->vrefresh == refresh_rate)
index = DRRS_LOW_RR;
if (index == intel_dp->drrs_state.refresh_rate_type) {
DRM_DEBUG_KMS(
"DRRS requested for previously set RR...ignoring\n");
return;
}
if (!intel_crtc->active) {
DRM_DEBUG_KMS("eDP encoder disabled. CRTC not Active\n");
return;
}
if (INTEL_INFO(dev)->gen > 6 && INTEL_INFO(dev)->gen < 8) {
reg = PIPECONF(intel_crtc->config.cpu_transcoder);
val = I915_READ(reg);
if (index > DRRS_HIGH_RR) {
val |= PIPECONF_EDP_RR_MODE_SWITCH;
intel_dp_set_m_n(intel_crtc);
} else {
val &= ~PIPECONF_EDP_RR_MODE_SWITCH;
}
I915_WRITE(reg, val);
}
/*
* mutex taken to ensure that there is no race between differnt
* drrs calls trying to update refresh rate. This scenario may occur
* in future when idleness detection based DRRS in kernel and
* possible calls from user space to set differnt RR are made.
*/
mutex_lock(&intel_dp->drrs_state.mutex);
intel_dp->drrs_state.refresh_rate_type = index;
mutex_unlock(&intel_dp->drrs_state.mutex);
DRM_DEBUG_KMS("eDP Refresh Rate set to : %dHz\n", refresh_rate);
}
static struct drm_display_mode *
intel_dp_drrs_init(struct intel_digital_port *intel_dig_port,
struct intel_connector *intel_connector,
struct drm_display_mode *fixed_mode)
{
struct drm_connector *connector = &intel_connector->base;
struct intel_dp *intel_dp = &intel_dig_port->dp;
struct drm_device *dev = intel_dig_port->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_display_mode *downclock_mode = NULL;
if (INTEL_INFO(dev)->gen <= 6) {
DRM_DEBUG_KMS("DRRS supported for Gen7 and above\n");
return NULL;
}
if (dev_priv->vbt.drrs_type != SEAMLESS_DRRS_SUPPORT) {
DRM_DEBUG_KMS("VBT doesn't support DRRS\n");
return NULL;
}
downclock_mode = intel_find_panel_downclock
(dev, fixed_mode, connector);
if (!downclock_mode) {
DRM_DEBUG_KMS("DRRS not supported\n");
return NULL;
}
dev_priv->drrs.connector = intel_connector;
mutex_init(&intel_dp->drrs_state.mutex);
intel_dp->drrs_state.type = dev_priv->vbt.drrs_type;
intel_dp->drrs_state.refresh_rate_type = DRRS_HIGH_RR;
DRM_DEBUG_KMS("seamless DRRS supported for eDP panel.\n");
return downclock_mode;
}
void intel_edp_panel_vdd_sanitize(struct intel_encoder *intel_encoder)
{
struct drm_device *dev = intel_encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dp *intel_dp;
enum intel_display_power_domain power_domain;
if (intel_encoder->type != INTEL_OUTPUT_EDP)
return;
intel_dp = enc_to_intel_dp(&intel_encoder->base);
pps_lock(intel_dp);
if (!edp_have_panel_vdd(intel_dp))
goto out;
/*
* The VDD bit needs a power domain reference, so if the bit is
* already enabled when we boot or resume, grab this reference and
* schedule a vdd off, so we don't hold on to the reference
* indefinitely.
*/
DRM_DEBUG_KMS("VDD left on by BIOS, adjusting state tracking\n");
power_domain = intel_display_port_power_domain(intel_encoder);
intel_display_power_get(dev_priv, power_domain);
edp_panel_vdd_schedule_off(intel_dp);
out:
pps_unlock(intel_dp);
}
static bool intel_edp_init_connector(struct intel_dp *intel_dp,
struct intel_connector *intel_connector,
struct edp_power_seq *power_seq)
{
struct drm_connector *connector = &intel_connector->base;
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = intel_encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_display_mode *fixed_mode = NULL;
struct drm_display_mode *downclock_mode = NULL;
bool has_dpcd;
struct drm_display_mode *scan;
struct edid *edid;
intel_dp->drrs_state.type = DRRS_NOT_SUPPORTED;
if (!is_edp(intel_dp))
return true;
intel_edp_panel_vdd_sanitize(intel_encoder);
/* Cache DPCD and EDID for edp. */
intel_edp_panel_vdd_on(intel_dp);
has_dpcd = intel_dp_get_dpcd(intel_dp);
intel_edp_panel_vdd_off(intel_dp, false);
if (has_dpcd) {
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11)
dev_priv->no_aux_handshake =
intel_dp->dpcd[DP_MAX_DOWNSPREAD] &
DP_NO_AUX_HANDSHAKE_LINK_TRAINING;
} else {
/* if this fails, presume the device is a ghost */
DRM_INFO("failed to retrieve link info, disabling eDP\n");
return false;
}
/* We now know it's not a ghost, init power sequence regs. */
pps_lock(intel_dp);
intel_dp_init_panel_power_sequencer_registers(dev, intel_dp, power_seq);
pps_unlock(intel_dp);
mutex_lock(&dev->mode_config.mutex);
edid = drm_get_edid(connector, &intel_dp->aux.ddc);
if (edid) {
if (drm_add_edid_modes(connector, edid)) {
drm_mode_connector_update_edid_property(connector,
edid);
drm_edid_to_eld(connector, edid);
} else {
kfree(edid);
edid = ERR_PTR(-EINVAL);
}
} else {
edid = ERR_PTR(-ENOENT);
}
intel_connector->edid = edid;
/* prefer fixed mode from EDID if available */
list_for_each_entry(scan, &connector->probed_modes, head) {
if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
fixed_mode = drm_mode_duplicate(dev, scan);
downclock_mode = intel_dp_drrs_init(
intel_dig_port,
intel_connector, fixed_mode);
break;
}
}
/* fallback to VBT if available for eDP */
if (!fixed_mode && dev_priv->vbt.lfp_lvds_vbt_mode) {
fixed_mode = drm_mode_duplicate(dev,
dev_priv->vbt.lfp_lvds_vbt_mode);
if (fixed_mode)
fixed_mode->type |= DRM_MODE_TYPE_PREFERRED;
}
mutex_unlock(&dev->mode_config.mutex);
if (IS_VALLEYVIEW(dev)) {
intel_dp->edp_notifier.notifier_call = edp_notify_handler;
register_reboot_notifier(&intel_dp->edp_notifier);
}
intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
intel_connector->panel.backlight_power = intel_edp_backlight_power;
intel_panel_setup_backlight(connector);
return true;
}
bool
intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
struct intel_connector *intel_connector)
{
struct drm_connector *connector = &intel_connector->base;
struct intel_dp *intel_dp = &intel_dig_port->dp;
struct intel_encoder *intel_encoder = &intel_dig_port->base;
struct drm_device *dev = intel_encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = intel_dig_port->port;
struct edp_power_seq power_seq = { 0 };
int type;
intel_dp->pps_pipe = INVALID_PIPE;
/* intel_dp vfuncs */
if (IS_VALLEYVIEW(dev))
intel_dp->get_aux_clock_divider = vlv_get_aux_clock_divider;
else if (IS_HASWELL(dev) || IS_BROADWELL(dev))
intel_dp->get_aux_clock_divider = hsw_get_aux_clock_divider;
else if (HAS_PCH_SPLIT(dev))
intel_dp->get_aux_clock_divider = ilk_get_aux_clock_divider;
else
intel_dp->get_aux_clock_divider = i9xx_get_aux_clock_divider;
intel_dp->get_aux_send_ctl = i9xx_get_aux_send_ctl;
/* Preserve the current hw state. */
intel_dp->DP = I915_READ(intel_dp->output_reg);
intel_dp->attached_connector = intel_connector;
if (intel_dp_is_edp(dev, port))
type = DRM_MODE_CONNECTOR_eDP;
else
type = DRM_MODE_CONNECTOR_DisplayPort;
/*
* For eDP we always set the encoder type to INTEL_OUTPUT_EDP, but
* for DP the encoder type can be set by the caller to
* INTEL_OUTPUT_UNKNOWN for DDI, so don't rewrite it.
*/
if (type == DRM_MODE_CONNECTOR_eDP)
intel_encoder->type = INTEL_OUTPUT_EDP;
DRM_DEBUG_KMS("Adding %s connector on port %c\n",
type == DRM_MODE_CONNECTOR_eDP ? "eDP" : "DP",
port_name(port));
drm_connector_init(dev, connector, &intel_dp_connector_funcs, type);
drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
connector->interlace_allowed = true;
connector->doublescan_allowed = 0;
INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
edp_panel_vdd_work);
intel_connector_attach_encoder(intel_connector, intel_encoder);
drm_connector_register(connector);
if (HAS_DDI(dev))
intel_connector->get_hw_state = intel_ddi_connector_get_hw_state;
else
intel_connector->get_hw_state = intel_connector_get_hw_state;
intel_connector->unregister = intel_dp_connector_unregister;
/* Set up the hotplug pin. */
switch (port) {
case PORT_A:
intel_encoder->hpd_pin = HPD_PORT_A;
break;
case PORT_B:
intel_encoder->hpd_pin = HPD_PORT_B;
break;
case PORT_C:
intel_encoder->hpd_pin = HPD_PORT_C;
break;
case PORT_D:
intel_encoder->hpd_pin = HPD_PORT_D;
break;
default:
BUG();
}
if (is_edp(intel_dp)) {
pps_lock(intel_dp);
if (IS_VALLEYVIEW(dev)) {
vlv_initial_power_sequencer_setup(intel_dp);
} else {
intel_dp_init_panel_power_timestamps(intel_dp);
intel_dp_init_panel_power_sequencer(dev, intel_dp,
&power_seq);
}
pps_unlock(intel_dp);
}
intel_dp_aux_init(intel_dp, intel_connector);
/* init MST on ports that can support it */
if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
if (port == PORT_B || port == PORT_C || port == PORT_D) {
intel_dp_mst_encoder_init(intel_dig_port,
intel_connector->base.base.id);
}
}
if (!intel_edp_init_connector(intel_dp, intel_connector, &power_seq)) {
drm_dp_aux_unregister(&intel_dp->aux);
if (is_edp(intel_dp)) {
cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
/*
* vdd might still be enabled do to the delayed vdd off.
* Make sure vdd is actually turned off here.
*/
pps_lock(intel_dp);
edp_panel_vdd_off_sync(intel_dp);
pps_unlock(intel_dp);
}
drm_connector_unregister(connector);
drm_connector_cleanup(connector);
return false;
}
intel_dp_add_properties(intel_dp, connector);
/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
* 0xd. Failure to do so will result in spurious interrupts being
* generated on the port when a cable is not attached.
*/
if (IS_G4X(dev) && !IS_GM45(dev)) {
u32 temp = I915_READ(PEG_BAND_GAP_DATA);
I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
}
return true;
}
void
intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_digital_port *intel_dig_port;
struct intel_encoder *intel_encoder;
struct drm_encoder *encoder;
struct intel_connector *intel_connector;
intel_dig_port = kzalloc(sizeof(*intel_dig_port), GFP_KERNEL);
if (!intel_dig_port)
return;
intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
if (!intel_connector) {
kfree(intel_dig_port);
return;
}
intel_encoder = &intel_dig_port->base;
encoder = &intel_encoder->base;
drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
DRM_MODE_ENCODER_TMDS);
intel_encoder->compute_config = intel_dp_compute_config;
intel_encoder->disable = intel_disable_dp;
intel_encoder->get_hw_state = intel_dp_get_hw_state;
intel_encoder->get_config = intel_dp_get_config;
intel_encoder->suspend = intel_dp_encoder_suspend;
if (IS_CHERRYVIEW(dev)) {
intel_encoder->pre_pll_enable = chv_dp_pre_pll_enable;
intel_encoder->pre_enable = chv_pre_enable_dp;
intel_encoder->enable = vlv_enable_dp;
intel_encoder->post_disable = chv_post_disable_dp;
} else if (IS_VALLEYVIEW(dev)) {
intel_encoder->pre_pll_enable = vlv_dp_pre_pll_enable;
intel_encoder->pre_enable = vlv_pre_enable_dp;
intel_encoder->enable = vlv_enable_dp;
intel_encoder->post_disable = vlv_post_disable_dp;
} else {
intel_encoder->pre_enable = g4x_pre_enable_dp;
intel_encoder->enable = g4x_enable_dp;
if (INTEL_INFO(dev)->gen >= 5)
intel_encoder->post_disable = ilk_post_disable_dp;
}
intel_dig_port->port = port;
intel_dig_port->dp.output_reg = output_reg;
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
if (IS_CHERRYVIEW(dev)) {
if (port == PORT_D)
intel_encoder->crtc_mask = 1 << 2;
else
intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
} else {
intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
}
intel_encoder->cloneable = 0;
intel_encoder->hot_plug = intel_dp_hot_plug;
intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
dev_priv->hpd_irq_port[port] = intel_dig_port;
if (!intel_dp_init_connector(intel_dig_port, intel_connector)) {
drm_encoder_cleanup(encoder);
kfree(intel_dig_port);
kfree(intel_connector);
}
}
void intel_dp_mst_suspend(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
/* disable MST */
for (i = 0; i < I915_MAX_PORTS; i++) {
struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i];
if (!intel_dig_port)
continue;
if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) {
if (!intel_dig_port->dp.can_mst)
continue;
if (intel_dig_port->dp.is_mst)
drm_dp_mst_topology_mgr_suspend(&intel_dig_port->dp.mst_mgr);
}
}
}
void intel_dp_mst_resume(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
for (i = 0; i < I915_MAX_PORTS; i++) {
struct intel_digital_port *intel_dig_port = dev_priv->hpd_irq_port[i];
if (!intel_dig_port)
continue;
if (intel_dig_port->base.type == INTEL_OUTPUT_DISPLAYPORT) {
int ret;
if (!intel_dig_port->dp.can_mst)
continue;
ret = drm_dp_mst_topology_mgr_resume(&intel_dig_port->dp.mst_mgr);
if (ret != 0) {
intel_dp_check_mst_status(&intel_dig_port->dp);
}
}
}
}
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