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linux/drivers/gpu/drm/i915/intel_dp.c
Daniel Vetter a1ceb67751 Merge the modeset-rework, basic conversion into drm-intel-next 
As a quick reference I'll detail the motivation and design of the new code a
bit here (mostly stitched together from patchbomb announcements and commits
introducing the new concepts).

The crtc helper code has the fundamental assumption that encoders and crtcs can
be enabled/disabled in any order, as long as we take care of depencies (which
means that enabled encoders need an enabled crtc to feed them data,
essentially).

Our hw works differently. We already have tons of ugly cases where crtc code
enables encoder hw (or encoder->mode_set enables stuff that should only be
enabled in enocder->commit) to work around these issues. But on the disable
side we can't pull off similar tricks - there we actually need to rework the
modeset sequence that controls all this. And this is also the real motivation
why I've finally undertaken this rewrite: eDP on my shiny new Ivybridge
Ultrabook is broken, and it's broken due to the wrong disable sequence ...

The new code introduces a few interfaces and concepts:

- Add new encoder->enable/disable functions which are directly called from the
crtc->enable/disable function. This ensures that the encoder's can be
enabled/disabled at a very specific in the modeset sequence, controlled by our
platform specific code (instead of the crtc helper code calling them at a time
it deems convenient).

- Rework the dpms code - our code has mostly 1:1 connector:encoder mappings and
does support cloning on only a few encoders, so we can simplify things quite a
bit.

- Also only ever disable/enable the entire output pipeline. This ensures that
we obey the right sequence of enabling/disabling things, trying to be clever
here mostly just complicates the code and results in bugs. For cloneable
encoders this requires a bit of special handling to ensure that outputs can
still be disabled individually, but it simplifies the common case.

- Add infrastructure to read out the current hw state. No amount of careful
ordering will help us if we brick the hw on the initial modeset setup. Which
could happen if we just randomly disable things, oblivious to the state set up
by the bios. Hence we need to be able to read that out. As a benefit, we grow a
few generic functions useful to cross-check our modeset code with actual hw
state.

With all this in place, we can copy&paste the crtc helper code into the
drm/i915 driver and start to rework it:

- As detailed above, the new code only disables/enables an entire output pipe.
As a preparation for global mode-changes (e.g. reassigning shared resources) it
keeps track of which pipes need to be touched by a set of bitmasks.

- To ensure that we correctly disable the current display pipes, we need to
know the currently active connector/encoder/crtc linking. The old crtc helper
simply overwrote these links with the new setup, the new code stages the new
links in ->new_* pointers. Those get commited to the real linking pointers once
the old output configuration has been torn down, before the ->mode_set
callbacks are called.

- Finally the code adds tons of self-consistency checks by employing the new hw
state readout functions to cross-check the actual hw state with what the
datastructure think it should be. These checks are done both after every
modeset and after the hw state has been read out and sanitized at boot/resume
time. All these checks greatly helped in tracking down regressions and bugs in
the new code.

With this new basis, a lot of cleanups and improvements to the code are now
possible (besides the DP fixes that ultimately made me write this), but not yet
done:

- I think we should create struct intel_mode and use it as the adjusted mode
everywhere to store little pieces like needs_tvclock, pipe dithering values or
dp link parameters. That would still be a layering violation, but at least we
wouldn't need to recompute these kinds of things in intel_display.c. Especially
the port bpc computation needed for selecting the pipe bpc and dithering
settings in intel_display.c is rather gross.

- In a related rework we could implement ->mode_valid in terms of ->mode_fixup
in a generic way - I've hunted down too many bugs where ->mode_valid did the
right thing, but ->mode_fixup didn't. Or vice versa, resulting in funny bugs
for user-supplied modes.

- Ditch the idea to rework the hdp handling in the common crtc helper code and
just move things to i915.ko. Which would rid us of the ->detect crtc helper
dependencies.

- LVDS wire pair and pll enabling is all done in the crtc->mode_set function
currently. We should be able to move this to the crtc_enable callbacks (or in
the case of the LVDS wire pair enabling, into some encoder callback).

Last, but not least, this new code should also help in enabling a few neat
features: The hw state readout code prepares (but there are still big pieces
missing) for fastboot, i.e. avoiding the inital modeset at boot-up and just
taking over the configuration left behind by the bios. We also should be able
to extend the configuration checks in the beginning of the modeset sequence and
make better decisions about shared resources (which is the entire point behind
the atomic/global modeset ioctl).

Tested-by: Jani Nikula <jani.nikula@intel.com>
Tested-by: Ben Widawsky <ben@bwidawsk.net>
Tested-by: Damien Lespiau <damien.lespiau@intel.com>
Tested-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
Acked-by: Vijay Purushothaman <vijay.a.purushothaman@intel.com>
Tested-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Acked-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Tested-by: Jesse Barnes <jbarnes@virtuousgeek.org>

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-09-06 22:52:43 +02:00

2658 lines
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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 "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "drm_edid.h"
#include "intel_drv.h"
#include "i915_drm.h"
#include "i915_drv.h"
#define DP_LINK_STATUS_SIZE 6
#define DP_LINK_CHECK_TIMEOUT (10 * 1000)
/**
* 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)
{
return intel_dp->base.type == INTEL_OUTPUT_EDP;
}
/**
* is_pch_edp - is the port on the PCH and attached to an eDP panel?
* @intel_dp: DP struct
*
* Returns true if the given DP struct corresponds to a PCH DP port attached
* to an eDP panel, false otherwise. Helpful for determining whether we
* may need FDI resources for a given DP output or not.
*/
static bool is_pch_edp(struct intel_dp *intel_dp)
{
return intel_dp->is_pch_edp;
}
/**
* is_cpu_edp - is the port on the CPU and attached to an eDP panel?
* @intel_dp: DP struct
*
* Returns true if the given DP struct corresponds to a CPU eDP port.
*/
static bool is_cpu_edp(struct intel_dp *intel_dp)
{
return is_edp(intel_dp) && !is_pch_edp(intel_dp);
}
static struct intel_dp *enc_to_intel_dp(struct drm_encoder *encoder)
{
return container_of(encoder, struct intel_dp, base.base);
}
static struct intel_dp *intel_attached_dp(struct drm_connector *connector)
{
return container_of(intel_attached_encoder(connector),
struct intel_dp, base);
}
/**
* intel_encoder_is_pch_edp - is the given encoder a PCH attached eDP?
* @encoder: DRM encoder
*
* Return true if @encoder corresponds to a PCH attached eDP panel. Needed
* by intel_display.c.
*/
bool intel_encoder_is_pch_edp(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp;
if (!encoder)
return false;
intel_dp = enc_to_intel_dp(encoder);
return is_pch_edp(intel_dp);
}
static void intel_dp_start_link_train(struct intel_dp *intel_dp);
static void intel_dp_complete_link_train(struct intel_dp *intel_dp);
static void intel_dp_link_down(struct intel_dp *intel_dp);
void
intel_edp_link_config(struct intel_encoder *intel_encoder,
int *lane_num, int *link_bw)
{
struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
*lane_num = intel_dp->lane_count;
if (intel_dp->link_bw == DP_LINK_BW_1_62)
*link_bw = 162000;
else if (intel_dp->link_bw == DP_LINK_BW_2_7)
*link_bw = 270000;
}
int
intel_edp_target_clock(struct intel_encoder *intel_encoder,
struct drm_display_mode *mode)
{
struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
if (intel_dp->panel_fixed_mode)
return intel_dp->panel_fixed_mode->clock;
else
return mode->clock;
}
static int
intel_dp_max_lane_count(struct intel_dp *intel_dp)
{
int max_lane_count = intel_dp->dpcd[DP_MAX_LANE_COUNT] & 0x1f;
switch (max_lane_count) {
case 1: case 2: case 4:
break;
default:
max_lane_count = 4;
}
return max_lane_count;
}
static int
intel_dp_max_link_bw(struct intel_dp *intel_dp)
{
int max_link_bw = intel_dp->dpcd[DP_MAX_LINK_RATE];
switch (max_link_bw) {
case DP_LINK_BW_1_62:
case DP_LINK_BW_2_7:
break;
default:
max_link_bw = DP_LINK_BW_1_62;
break;
}
return max_link_bw;
}
static int
intel_dp_link_clock(uint8_t link_bw)
{
if (link_bw == DP_LINK_BW_2_7)
return 270000;
else
return 162000;
}
/*
* 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 bool
intel_dp_adjust_dithering(struct intel_dp *intel_dp,
struct drm_display_mode *mode,
bool adjust_mode)
{
int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_dp));
int max_lanes = intel_dp_max_lane_count(intel_dp);
int max_rate, mode_rate;
mode_rate = intel_dp_link_required(mode->clock, 24);
max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);
if (mode_rate > max_rate) {
mode_rate = intel_dp_link_required(mode->clock, 18);
if (mode_rate > max_rate)
return false;
if (adjust_mode)
mode->private_flags
|= INTEL_MODE_DP_FORCE_6BPC;
return true;
}
return true;
}
static int
intel_dp_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
if (is_edp(intel_dp) && intel_dp->panel_fixed_mode) {
if (mode->hdisplay > intel_dp->panel_fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > intel_dp->panel_fixed_mode->vdisplay)
return MODE_PANEL;
}
if (!intel_dp_adjust_dithering(intel_dp, mode, false))
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;
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 bool ironlake_edp_have_panel_power(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
return (I915_READ(PCH_PP_STATUS) & PP_ON) != 0;
}
static bool ironlake_edp_have_panel_vdd(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
return (I915_READ(PCH_PP_CONTROL) & EDP_FORCE_VDD) != 0;
}
static void
intel_dp_check_edp(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
if (!is_edp(intel_dp))
return;
if (!ironlake_edp_have_panel_power(intel_dp) && !ironlake_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(PCH_PP_STATUS),
I915_READ(PCH_PP_CONTROL));
}
}
static int
intel_dp_aux_ch(struct intel_dp *intel_dp,
uint8_t *send, int send_bytes,
uint8_t *recv, int recv_size)
{
uint32_t output_reg = intel_dp->output_reg;
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t ch_ctl = output_reg + 0x10;
uint32_t ch_data = ch_ctl + 4;
int i;
int recv_bytes;
uint32_t status;
uint32_t aux_clock_divider;
int try, precharge;
intel_dp_check_edp(intel_dp);
/* 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
*
* Note that PCH attached eDP panels should use a 125MHz input
* clock divider.
*/
if (is_cpu_edp(intel_dp)) {
if (IS_GEN6(dev) || IS_GEN7(dev))
aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
else
aux_clock_divider = 225; /* eDP input clock at 450Mhz */
} else if (HAS_PCH_SPLIT(dev))
aux_clock_divider = 63; /* IRL input clock fixed at 125Mhz */
else
aux_clock_divider = intel_hrawclk(dev) / 2;
if (IS_GEN6(dev))
precharge = 3;
else
precharge = 5;
/* Try to wait for any previous AUX channel activity */
for (try = 0; try < 3; try++) {
status = I915_READ(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));
return -EBUSY;
}
/* 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,
DP_AUX_CH_CTL_SEND_BUSY |
DP_AUX_CH_CTL_TIME_OUT_400us |
(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) |
DP_AUX_CH_CTL_DONE |
DP_AUX_CH_CTL_TIME_OUT_ERROR |
DP_AUX_CH_CTL_RECEIVE_ERROR);
for (;;) {
status = I915_READ(ch_ctl);
if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
break;
udelay(100);
}
/* 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) == 0) {
DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
return -EBUSY;
}
/* 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);
return -EIO;
}
/* 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);
return -ETIMEDOUT;
}
/* 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);
return recv_bytes;
}
/* Write data to the aux channel in native mode */
static int
intel_dp_aux_native_write(struct intel_dp *intel_dp,
uint16_t address, uint8_t *send, int send_bytes)
{
int ret;
uint8_t msg[20];
int msg_bytes;
uint8_t ack;
intel_dp_check_edp(intel_dp);
if (send_bytes > 16)
return -1;
msg[0] = AUX_NATIVE_WRITE << 4;
msg[1] = address >> 8;
msg[2] = address & 0xff;
msg[3] = send_bytes - 1;
memcpy(&msg[4], send, send_bytes);
msg_bytes = send_bytes + 4;
for (;;) {
ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes, &ack, 1);
if (ret < 0)
return ret;
if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
break;
else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
udelay(100);
else
return -EIO;
}
return send_bytes;
}
/* Write a single byte to the aux channel in native mode */
static int
intel_dp_aux_native_write_1(struct intel_dp *intel_dp,
uint16_t address, uint8_t byte)
{
return intel_dp_aux_native_write(intel_dp, address, &byte, 1);
}
/* read bytes from a native aux channel */
static int
intel_dp_aux_native_read(struct intel_dp *intel_dp,
uint16_t address, uint8_t *recv, int recv_bytes)
{
uint8_t msg[4];
int msg_bytes;
uint8_t reply[20];
int reply_bytes;
uint8_t ack;
int ret;
intel_dp_check_edp(intel_dp);
msg[0] = AUX_NATIVE_READ << 4;
msg[1] = address >> 8;
msg[2] = address & 0xff;
msg[3] = recv_bytes - 1;
msg_bytes = 4;
reply_bytes = recv_bytes + 1;
for (;;) {
ret = intel_dp_aux_ch(intel_dp, msg, msg_bytes,
reply, reply_bytes);
if (ret == 0)
return -EPROTO;
if (ret < 0)
return ret;
ack = reply[0];
if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK) {
memcpy(recv, reply + 1, ret - 1);
return ret - 1;
}
else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
udelay(100);
else
return -EIO;
}
}
static int
intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
uint8_t write_byte, uint8_t *read_byte)
{
struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
struct intel_dp *intel_dp = container_of(adapter,
struct intel_dp,
adapter);
uint16_t address = algo_data->address;
uint8_t msg[5];
uint8_t reply[2];
unsigned retry;
int msg_bytes;
int reply_bytes;
int ret;
intel_dp_check_edp(intel_dp);
/* Set up the command byte */
if (mode & MODE_I2C_READ)
msg[0] = AUX_I2C_READ << 4;
else
msg[0] = AUX_I2C_WRITE << 4;
if (!(mode & MODE_I2C_STOP))
msg[0] |= AUX_I2C_MOT << 4;
msg[1] = address >> 8;
msg[2] = address;
switch (mode) {
case MODE_I2C_WRITE:
msg[3] = 0;
msg[4] = write_byte;
msg_bytes = 5;
reply_bytes = 1;
break;
case MODE_I2C_READ:
msg[3] = 0;
msg_bytes = 4;
reply_bytes = 2;
break;
default:
msg_bytes = 3;
reply_bytes = 1;
break;
}
for (retry = 0; retry < 5; retry++) {
ret = intel_dp_aux_ch(intel_dp,
msg, msg_bytes,
reply, reply_bytes);
if (ret < 0) {
DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
return ret;
}
switch (reply[0] & AUX_NATIVE_REPLY_MASK) {
case AUX_NATIVE_REPLY_ACK:
/* I2C-over-AUX Reply field is only valid
* when paired with AUX ACK.
*/
break;
case AUX_NATIVE_REPLY_NACK:
DRM_DEBUG_KMS("aux_ch native nack\n");
return -EREMOTEIO;
case AUX_NATIVE_REPLY_DEFER:
udelay(100);
continue;
default:
DRM_ERROR("aux_ch invalid native reply 0x%02x\n",
reply[0]);
return -EREMOTEIO;
}
switch (reply[0] & AUX_I2C_REPLY_MASK) {
case AUX_I2C_REPLY_ACK:
if (mode == MODE_I2C_READ) {
*read_byte = reply[1];
}
return reply_bytes - 1;
case AUX_I2C_REPLY_NACK:
DRM_DEBUG_KMS("aux_i2c nack\n");
return -EREMOTEIO;
case AUX_I2C_REPLY_DEFER:
DRM_DEBUG_KMS("aux_i2c defer\n");
udelay(100);
break;
default:
DRM_ERROR("aux_i2c invalid reply 0x%02x\n", reply[0]);
return -EREMOTEIO;
}
}
DRM_ERROR("too many retries, giving up\n");
return -EREMOTEIO;
}
static void ironlake_edp_panel_vdd_on(struct intel_dp *intel_dp);
static void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync);
static int
intel_dp_i2c_init(struct intel_dp *intel_dp,
struct intel_connector *intel_connector, const char *name)
{
int ret;
DRM_DEBUG_KMS("i2c_init %s\n", name);
intel_dp->algo.running = false;
intel_dp->algo.address = 0;
intel_dp->algo.aux_ch = intel_dp_i2c_aux_ch;
memset(&intel_dp->adapter, '\0', sizeof(intel_dp->adapter));
intel_dp->adapter.owner = THIS_MODULE;
intel_dp->adapter.class = I2C_CLASS_DDC;
strncpy(intel_dp->adapter.name, name, sizeof(intel_dp->adapter.name) - 1);
intel_dp->adapter.name[sizeof(intel_dp->adapter.name) - 1] = '\0';
intel_dp->adapter.algo_data = &intel_dp->algo;
intel_dp->adapter.dev.parent = &intel_connector->base.kdev;
ironlake_edp_panel_vdd_on(intel_dp);
ret = i2c_dp_aux_add_bus(&intel_dp->adapter);
ironlake_edp_panel_vdd_off(intel_dp, false);
return ret;
}
static bool
intel_dp_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
int lane_count, clock;
int max_lane_count = intel_dp_max_lane_count(intel_dp);
int max_clock = intel_dp_max_link_bw(intel_dp) == DP_LINK_BW_2_7 ? 1 : 0;
int bpp, mode_rate;
static int bws[2] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7 };
if (is_edp(intel_dp) && intel_dp->panel_fixed_mode) {
intel_fixed_panel_mode(intel_dp->panel_fixed_mode, adjusted_mode);
intel_pch_panel_fitting(dev, DRM_MODE_SCALE_FULLSCREEN,
mode, adjusted_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->clock);
if (!intel_dp_adjust_dithering(intel_dp, adjusted_mode, true))
return false;
bpp = adjusted_mode->private_flags & INTEL_MODE_DP_FORCE_6BPC ? 18 : 24;
mode_rate = intel_dp_link_required(adjusted_mode->clock, bpp);
for (clock = 0; clock <= max_clock; clock++) {
for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
int link_avail = intel_dp_max_data_rate(intel_dp_link_clock(bws[clock]), lane_count);
if (mode_rate <= link_avail) {
intel_dp->link_bw = bws[clock];
intel_dp->lane_count = lane_count;
adjusted_mode->clock = intel_dp_link_clock(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,
adjusted_mode->clock, bpp);
DRM_DEBUG_KMS("DP link bw required %i available %i\n",
mode_rate, link_avail);
return true;
}
}
}
return false;
}
struct intel_dp_m_n {
uint32_t tu;
uint32_t gmch_m;
uint32_t gmch_n;
uint32_t link_m;
uint32_t link_n;
};
static void
intel_reduce_ratio(uint32_t *num, uint32_t *den)
{
while (*num > 0xffffff || *den > 0xffffff) {
*num >>= 1;
*den >>= 1;
}
}
static void
intel_dp_compute_m_n(int bpp,
int nlanes,
int pixel_clock,
int link_clock,
struct intel_dp_m_n *m_n)
{
m_n->tu = 64;
m_n->gmch_m = (pixel_clock * bpp) >> 3;
m_n->gmch_n = link_clock * nlanes;
intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
m_n->link_m = pixel_clock;
m_n->link_n = link_clock;
intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
}
void
intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = crtc->dev;
struct intel_encoder *encoder;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
int lane_count = 4;
struct intel_dp_m_n m_n;
int pipe = intel_crtc->pipe;
/*
* Find the lane count in the intel_encoder private
*/
for_each_encoder_on_crtc(dev, crtc, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT ||
intel_dp->base.type == INTEL_OUTPUT_EDP)
{
lane_count = intel_dp->lane_count;
break;
}
}
/*
* Compute the GMCH and Link ratios. The '3' here is
* the number of bytes_per_pixel post-LUT, which we always
* set up for 8-bits of R/G/B, or 3 bytes total.
*/
intel_dp_compute_m_n(intel_crtc->bpp, lane_count,
mode->clock, adjusted_mode->clock, &m_n);
if (HAS_PCH_SPLIT(dev)) {
I915_WRITE(TRANSDATA_M1(pipe),
((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
m_n.gmch_m);
I915_WRITE(TRANSDATA_N1(pipe), m_n.gmch_n);
I915_WRITE(TRANSDPLINK_M1(pipe), m_n.link_m);
I915_WRITE(TRANSDPLINK_N1(pipe), m_n.link_n);
} else {
I915_WRITE(PIPE_GMCH_DATA_M(pipe),
((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
m_n.gmch_m);
I915_WRITE(PIPE_GMCH_DATA_N(pipe), m_n.gmch_n);
I915_WRITE(PIPE_DP_LINK_M(pipe), m_n.link_m);
I915_WRITE(PIPE_DP_LINK_N(pipe), m_n.link_n);
}
}
static void ironlake_edp_pll_on(struct drm_encoder *encoder);
static void ironlake_edp_pll_off(struct drm_encoder *encoder);
static void
intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
struct drm_crtc *crtc = intel_dp->base.base.crtc;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
/* Turn on the eDP PLL if needed */
if (is_edp(intel_dp)) {
if (!is_pch_edp(intel_dp))
ironlake_edp_pll_on(encoder);
else
ironlake_edp_pll_off(encoder);
}
/*
* 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;
switch (intel_dp->lane_count) {
case 1:
intel_dp->DP |= DP_PORT_WIDTH_1;
break;
case 2:
intel_dp->DP |= DP_PORT_WIDTH_2;
break;
case 4:
intel_dp->DP |= DP_PORT_WIDTH_4;
break;
}
if (intel_dp->has_audio) {
DRM_DEBUG_DRIVER("Enabling DP audio on pipe %c\n",
pipe_name(intel_crtc->pipe));
intel_dp->DP |= DP_AUDIO_OUTPUT_ENABLE;
intel_write_eld(encoder, adjusted_mode);
}
memset(intel_dp->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
intel_dp->link_configuration[0] = intel_dp->link_bw;
intel_dp->link_configuration[1] = intel_dp->lane_count;
intel_dp->link_configuration[8] = DP_SET_ANSI_8B10B;
/*
* Check for DPCD version > 1.1 and enhanced framing support
*/
if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
(intel_dp->dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) {
intel_dp->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
}
/* Split out the IBX/CPU vs CPT settings */
if (is_cpu_edp(intel_dp) && IS_GEN7(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 (intel_dp->link_configuration[1] & DP_LANE_COUNT_ENHANCED_FRAME_EN)
intel_dp->DP |= DP_ENHANCED_FRAMING;
intel_dp->DP |= intel_crtc->pipe << 29;
/* don't miss out required setting for eDP */
intel_dp->DP |= DP_PLL_ENABLE;
if (adjusted_mode->clock < 200000)
intel_dp->DP |= DP_PLL_FREQ_160MHZ;
else
intel_dp->DP |= DP_PLL_FREQ_270MHZ;
} else if (!HAS_PCH_CPT(dev) || is_cpu_edp(intel_dp)) {
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 (intel_dp->link_configuration[1] & DP_LANE_COUNT_ENHANCED_FRAME_EN)
intel_dp->DP |= DP_ENHANCED_FRAMING;
if (intel_crtc->pipe == 1)
intel_dp->DP |= DP_PIPEB_SELECT;
if (is_cpu_edp(intel_dp)) {
/* don't miss out required setting for eDP */
intel_dp->DP |= DP_PLL_ENABLE;
if (adjusted_mode->clock < 200000)
intel_dp->DP |= DP_PLL_FREQ_160MHZ;
else
intel_dp->DP |= DP_PLL_FREQ_270MHZ;
}
} else {
intel_dp->DP |= DP_LINK_TRAIN_OFF_CPT;
}
}
#define IDLE_ON_MASK (PP_ON | 0 | PP_SEQUENCE_MASK | 0 | PP_SEQUENCE_STATE_MASK)
#define IDLE_ON_VALUE (PP_ON | 0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_ON_IDLE)
#define IDLE_OFF_MASK (PP_ON | 0 | PP_SEQUENCE_MASK | 0 | PP_SEQUENCE_STATE_MASK)
#define IDLE_OFF_VALUE (0 | 0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_OFF_IDLE)
#define IDLE_CYCLE_MASK (PP_ON | 0 | PP_SEQUENCE_MASK | PP_CYCLE_DELAY_ACTIVE | PP_SEQUENCE_STATE_MASK)
#define IDLE_CYCLE_VALUE (0 | 0 | PP_SEQUENCE_NONE | 0 | PP_SEQUENCE_STATE_OFF_IDLE)
static void ironlake_wait_panel_status(struct intel_dp *intel_dp,
u32 mask,
u32 value)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
DRM_DEBUG_KMS("mask %08x value %08x status %08x control %08x\n",
mask, value,
I915_READ(PCH_PP_STATUS),
I915_READ(PCH_PP_CONTROL));
if (_wait_for((I915_READ(PCH_PP_STATUS) & mask) == value, 5000, 10)) {
DRM_ERROR("Panel status timeout: status %08x control %08x\n",
I915_READ(PCH_PP_STATUS),
I915_READ(PCH_PP_CONTROL));
}
}
static void ironlake_wait_panel_on(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power on\n");
ironlake_wait_panel_status(intel_dp, IDLE_ON_MASK, IDLE_ON_VALUE);
}
static void ironlake_wait_panel_off(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power off time\n");
ironlake_wait_panel_status(intel_dp, IDLE_OFF_MASK, IDLE_OFF_VALUE);
}
static void ironlake_wait_panel_power_cycle(struct intel_dp *intel_dp)
{
DRM_DEBUG_KMS("Wait for panel power cycle\n");
ironlake_wait_panel_status(intel_dp, IDLE_CYCLE_MASK, IDLE_CYCLE_VALUE);
}
/* Read the current pp_control value, unlocking the register if it
* is locked
*/
static u32 ironlake_get_pp_control(struct drm_i915_private *dev_priv)
{
u32 control = I915_READ(PCH_PP_CONTROL);
control &= ~PANEL_UNLOCK_MASK;
control |= PANEL_UNLOCK_REGS;
return control;
}
static void ironlake_edp_panel_vdd_on(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP VDD on\n");
WARN(intel_dp->want_panel_vdd,
"eDP VDD already requested on\n");
intel_dp->want_panel_vdd = true;
if (ironlake_edp_have_panel_vdd(intel_dp)) {
DRM_DEBUG_KMS("eDP VDD already on\n");
return;
}
if (!ironlake_edp_have_panel_power(intel_dp))
ironlake_wait_panel_power_cycle(intel_dp);
pp = ironlake_get_pp_control(dev_priv);
pp |= EDP_FORCE_VDD;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
DRM_DEBUG_KMS("PCH_PP_STATUS: 0x%08x PCH_PP_CONTROL: 0x%08x\n",
I915_READ(PCH_PP_STATUS), I915_READ(PCH_PP_CONTROL));
/*
* If the panel wasn't on, delay before accessing aux channel
*/
if (!ironlake_edp_have_panel_power(intel_dp)) {
DRM_DEBUG_KMS("eDP was not running\n");
msleep(intel_dp->panel_power_up_delay);
}
}
static void ironlake_panel_vdd_off_sync(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!intel_dp->want_panel_vdd && ironlake_edp_have_panel_vdd(intel_dp)) {
pp = ironlake_get_pp_control(dev_priv);
pp &= ~EDP_FORCE_VDD;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
/* Make sure sequencer is idle before allowing subsequent activity */
DRM_DEBUG_KMS("PCH_PP_STATUS: 0x%08x PCH_PP_CONTROL: 0x%08x\n",
I915_READ(PCH_PP_STATUS), I915_READ(PCH_PP_CONTROL));
msleep(intel_dp->panel_power_down_delay);
}
}
static void ironlake_panel_vdd_work(struct work_struct *__work)
{
struct intel_dp *intel_dp = container_of(to_delayed_work(__work),
struct intel_dp, panel_vdd_work);
struct drm_device *dev = intel_dp->base.base.dev;
mutex_lock(&dev->mode_config.mutex);
ironlake_panel_vdd_off_sync(intel_dp);
mutex_unlock(&dev->mode_config.mutex);
}
static void ironlake_edp_panel_vdd_off(struct intel_dp *intel_dp, bool sync)
{
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP VDD off %d\n", intel_dp->want_panel_vdd);
WARN(!intel_dp->want_panel_vdd, "eDP VDD not forced on");
intel_dp->want_panel_vdd = false;
if (sync) {
ironlake_panel_vdd_off_sync(intel_dp);
} else {
/*
* 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
*/
schedule_delayed_work(&intel_dp->panel_vdd_work,
msecs_to_jiffies(intel_dp->panel_power_cycle_delay * 5));
}
}
static void ironlake_edp_panel_on(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP power on\n");
if (ironlake_edp_have_panel_power(intel_dp)) {
DRM_DEBUG_KMS("eDP power already on\n");
return;
}
ironlake_wait_panel_power_cycle(intel_dp);
pp = ironlake_get_pp_control(dev_priv);
if (IS_GEN5(dev)) {
/* ILK workaround: disable reset around power sequence */
pp &= ~PANEL_POWER_RESET;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
}
pp |= POWER_TARGET_ON;
if (!IS_GEN5(dev))
pp |= PANEL_POWER_RESET;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
ironlake_wait_panel_on(intel_dp);
if (IS_GEN5(dev)) {
pp |= PANEL_POWER_RESET; /* restore panel reset bit */
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
}
}
static void ironlake_edp_panel_off(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("Turn eDP power off\n");
WARN(!intel_dp->want_panel_vdd, "Need VDD to turn off panel\n");
pp = ironlake_get_pp_control(dev_priv);
/* 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 | EDP_FORCE_VDD | PANEL_POWER_RESET | EDP_BLC_ENABLE);
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
intel_dp->want_panel_vdd = false;
ironlake_wait_panel_off(intel_dp);
}
static void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("\n");
/*
* 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.
*/
msleep(intel_dp->backlight_on_delay);
pp = ironlake_get_pp_control(dev_priv);
pp |= EDP_BLC_ENABLE;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
}
static void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (!is_edp(intel_dp))
return;
DRM_DEBUG_KMS("\n");
pp = ironlake_get_pp_control(dev_priv);
pp &= ~EDP_BLC_ENABLE;
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
msleep(intel_dp->backlight_off_delay);
}
static void ironlake_edp_pll_on(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpa_ctl;
DRM_DEBUG_KMS("\n");
dpa_ctl = I915_READ(DP_A);
dpa_ctl |= DP_PLL_ENABLE;
I915_WRITE(DP_A, dpa_ctl);
POSTING_READ(DP_A);
udelay(200);
}
static void ironlake_edp_pll_off(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 dpa_ctl;
dpa_ctl = I915_READ(DP_A);
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 */
static 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 = intel_dp_aux_native_write_1(intel_dp, DP_SET_POWER,
DP_SET_POWER_D3);
if (ret != 1)
DRM_DEBUG_DRIVER("failed to write sink power state\n");
} 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 = intel_dp_aux_native_write_1(intel_dp,
DP_SET_POWER,
DP_SET_POWER_D0);
if (ret == 1)
break;
msleep(1);
}
}
}
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);
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 tmp = I915_READ(intel_dp->output_reg);
if (!(tmp & DP_PORT_EN))
return false;
if (is_cpu_edp(intel_dp) && IS_GEN7(dev)) {
*pipe = PORT_TO_PIPE_CPT(tmp);
} else if (!HAS_PCH_CPT(dev) || is_cpu_edp(intel_dp)) {
*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(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_disable_dp(struct intel_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
/* 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. */
ironlake_edp_panel_vdd_on(intel_dp);
ironlake_edp_backlight_off(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
ironlake_edp_panel_off(intel_dp);
intel_dp_link_down(intel_dp);
}
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);
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
if (!(dp_reg & DP_PORT_EN)) {
intel_dp_start_link_train(intel_dp);
ironlake_edp_panel_on(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, true);
intel_dp_complete_link_train(intel_dp);
} else
ironlake_edp_panel_vdd_off(intel_dp, false);
ironlake_edp_backlight_on(intel_dp);
}
static void
intel_dp_dpms(struct drm_connector *connector, int mode)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
/* DP supports only 2 dpms states. */
if (mode != DRM_MODE_DPMS_ON)
mode = DRM_MODE_DPMS_OFF;
if (mode == connector->dpms)
return;
connector->dpms = mode;
/* Only need to change hw state when actually enabled */
if (!intel_dp->base.base.crtc) {
intel_dp->base.connectors_active = false;
return;
}
if (mode != DRM_MODE_DPMS_ON) {
intel_encoder_dpms(&intel_dp->base, mode);
if (is_cpu_edp(intel_dp))
ironlake_edp_pll_off(&intel_dp->base.base);
} else {
if (is_cpu_edp(intel_dp))
ironlake_edp_pll_on(&intel_dp->base.base);
intel_encoder_dpms(&intel_dp->base, mode);
}
intel_modeset_check_state(connector->dev);
}
/*
* Native read with retry for link status and receiver capability reads for
* cases where the sink may still be asleep.
*/
static bool
intel_dp_aux_native_read_retry(struct intel_dp *intel_dp, uint16_t address,
uint8_t *recv, int recv_bytes)
{
int ret, i;
/*
* Sinks are *supposed* to come up within 1ms from an off state,
* but we're also supposed to retry 3 times per the spec.
*/
for (i = 0; i < 3; i++) {
ret = intel_dp_aux_native_read(intel_dp, address, recv,
recv_bytes);
if (ret == recv_bytes)
return true;
msleep(1);
}
return false;
}
/*
* 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_aux_native_read_retry(intel_dp,
DP_LANE0_1_STATUS,
link_status,
DP_LINK_STATUS_SIZE);
}
static uint8_t
intel_dp_link_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
int r)
{
return link_status[r - DP_LANE0_1_STATUS];
}
static uint8_t
intel_get_adjust_request_voltage(uint8_t adjust_request[2],
int lane)
{
int s = ((lane & 1) ?
DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
uint8_t l = adjust_request[lane>>1];
return ((l >> s) & 3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
}
static uint8_t
intel_get_adjust_request_pre_emphasis(uint8_t adjust_request[2],
int lane)
{
int s = ((lane & 1) ?
DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
uint8_t l = adjust_request[lane>>1];
return ((l >> s) & 3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
}
#if 0
static char *voltage_names[] = {
"0.4V", "0.6V", "0.8V", "1.2V"
};
static char *pre_emph_names[] = {
"0dB", "3.5dB", "6dB", "9.5dB"
};
static char *link_train_names[] = {
"pattern 1", "pattern 2", "idle", "off"
};
#endif
/*
* These are source-specific values; current Intel hardware supports
* a maximum voltage of 800mV and a maximum pre-emphasis of 6dB
*/
static uint8_t
intel_dp_voltage_max(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
return DP_TRAIN_VOLTAGE_SWING_800;
else if (HAS_PCH_CPT(dev) && !is_cpu_edp(intel_dp))
return DP_TRAIN_VOLTAGE_SWING_1200;
else
return DP_TRAIN_VOLTAGE_SWING_800;
}
static uint8_t
intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
{
struct drm_device *dev = intel_dp->base.base.dev;
if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_400:
return DP_TRAIN_PRE_EMPHASIS_6;
case DP_TRAIN_VOLTAGE_SWING_600:
case DP_TRAIN_VOLTAGE_SWING_800:
return DP_TRAIN_PRE_EMPHASIS_3_5;
default:
return DP_TRAIN_PRE_EMPHASIS_0;
}
} else {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_400:
return DP_TRAIN_PRE_EMPHASIS_6;
case DP_TRAIN_VOLTAGE_SWING_600:
return DP_TRAIN_PRE_EMPHASIS_6;
case DP_TRAIN_VOLTAGE_SWING_800:
return DP_TRAIN_PRE_EMPHASIS_3_5;
case DP_TRAIN_VOLTAGE_SWING_1200:
default:
return DP_TRAIN_PRE_EMPHASIS_0;
}
}
}
static void
intel_get_adjust_train(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
{
uint8_t v = 0;
uint8_t p = 0;
int lane;
uint8_t *adjust_request = link_status + (DP_ADJUST_REQUEST_LANE0_1 - DP_LANE0_1_STATUS);
uint8_t voltage_max;
uint8_t preemph_max;
for (lane = 0; lane < intel_dp->lane_count; lane++) {
uint8_t this_v = intel_get_adjust_request_voltage(adjust_request, lane);
uint8_t this_p = intel_get_adjust_request_pre_emphasis(adjust_request, 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_dp_signal_levels(uint8_t train_set)
{
uint32_t signal_levels = 0;
switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_400:
default:
signal_levels |= DP_VOLTAGE_0_4;
break;
case DP_TRAIN_VOLTAGE_SWING_600:
signal_levels |= DP_VOLTAGE_0_6;
break;
case DP_TRAIN_VOLTAGE_SWING_800:
signal_levels |= DP_VOLTAGE_0_8;
break;
case DP_TRAIN_VOLTAGE_SWING_1200:
signal_levels |= DP_VOLTAGE_1_2;
break;
}
switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
case DP_TRAIN_PRE_EMPHASIS_0:
default:
signal_levels |= DP_PRE_EMPHASIS_0;
break;
case DP_TRAIN_PRE_EMPHASIS_3_5:
signal_levels |= DP_PRE_EMPHASIS_3_5;
break;
case DP_TRAIN_PRE_EMPHASIS_6:
signal_levels |= DP_PRE_EMPHASIS_6;
break;
case DP_TRAIN_PRE_EMPHASIS_9_5:
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_400 | DP_TRAIN_PRE_EMPHASIS_0:
case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_0:
return EDP_LINK_TRAIN_400_600MV_0DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_3_5:
return EDP_LINK_TRAIN_400MV_3_5DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_6:
case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_6:
return EDP_LINK_TRAIN_400_600MV_6DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_3_5:
case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_3_5:
return EDP_LINK_TRAIN_600_800MV_3_5DB_SNB_B;
case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_0:
case DP_TRAIN_VOLTAGE_SWING_1200 | DP_TRAIN_PRE_EMPHASIS_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_400 | DP_TRAIN_PRE_EMPHASIS_0:
return EDP_LINK_TRAIN_400MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_3_5:
return EDP_LINK_TRAIN_400MV_3_5DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_400 | DP_TRAIN_PRE_EMPHASIS_6:
return EDP_LINK_TRAIN_400MV_6DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_0:
return EDP_LINK_TRAIN_600MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_600 | DP_TRAIN_PRE_EMPHASIS_3_5:
return EDP_LINK_TRAIN_600MV_3_5DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_0:
return EDP_LINK_TRAIN_800MV_0DB_IVB;
case DP_TRAIN_VOLTAGE_SWING_800 | DP_TRAIN_PRE_EMPHASIS_3_5:
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;
}
}
static uint8_t
intel_get_lane_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
int lane)
{
int s = (lane & 1) * 4;
uint8_t l = link_status[lane>>1];
return (l >> s) & 0xf;
}
/* Check for clock recovery is done on all channels */
static bool
intel_clock_recovery_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
{
int lane;
uint8_t lane_status;
for (lane = 0; lane < lane_count; lane++) {
lane_status = intel_get_lane_status(link_status, lane);
if ((lane_status & DP_LANE_CR_DONE) == 0)
return false;
}
return true;
}
/* Check to see if channel eq is done on all channels */
#define CHANNEL_EQ_BITS (DP_LANE_CR_DONE|\
DP_LANE_CHANNEL_EQ_DONE|\
DP_LANE_SYMBOL_LOCKED)
static bool
intel_channel_eq_ok(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
{
uint8_t lane_align;
uint8_t lane_status;
int lane;
lane_align = intel_dp_link_status(link_status,
DP_LANE_ALIGN_STATUS_UPDATED);
if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
return false;
for (lane = 0; lane < intel_dp->lane_count; lane++) {
lane_status = intel_get_lane_status(link_status, lane);
if ((lane_status & CHANNEL_EQ_BITS) != CHANNEL_EQ_BITS)
return false;
}
return true;
}
static bool
intel_dp_set_link_train(struct intel_dp *intel_dp,
uint32_t dp_reg_value,
uint8_t dp_train_pat)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || !is_cpu_edp(intel_dp))) {
dp_reg_value &= ~DP_LINK_TRAIN_MASK_CPT;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
dp_reg_value |= DP_LINK_TRAIN_OFF_CPT;
break;
case DP_TRAINING_PATTERN_1:
dp_reg_value |= DP_LINK_TRAIN_PAT_1_CPT;
break;
case DP_TRAINING_PATTERN_2:
dp_reg_value |= DP_LINK_TRAIN_PAT_2_CPT;
break;
case DP_TRAINING_PATTERN_3:
DRM_ERROR("DP training pattern 3 not supported\n");
dp_reg_value |= DP_LINK_TRAIN_PAT_2_CPT;
break;
}
} else {
dp_reg_value &= ~DP_LINK_TRAIN_MASK;
switch (dp_train_pat & DP_TRAINING_PATTERN_MASK) {
case DP_TRAINING_PATTERN_DISABLE:
dp_reg_value |= DP_LINK_TRAIN_OFF;
break;
case DP_TRAINING_PATTERN_1:
dp_reg_value |= DP_LINK_TRAIN_PAT_1;
break;
case DP_TRAINING_PATTERN_2:
dp_reg_value |= DP_LINK_TRAIN_PAT_2;
break;
case DP_TRAINING_PATTERN_3:
DRM_ERROR("DP training pattern 3 not supported\n");
dp_reg_value |= DP_LINK_TRAIN_PAT_2;
break;
}
}
I915_WRITE(intel_dp->output_reg, dp_reg_value);
POSTING_READ(intel_dp->output_reg);
intel_dp_aux_native_write_1(intel_dp,
DP_TRAINING_PATTERN_SET,
dp_train_pat);
if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) !=
DP_TRAINING_PATTERN_DISABLE) {
ret = intel_dp_aux_native_write(intel_dp,
DP_TRAINING_LANE0_SET,
intel_dp->train_set,
intel_dp->lane_count);
if (ret != intel_dp->lane_count)
return false;
}
return true;
}
/* Enable corresponding port and start training pattern 1 */
static void
intel_dp_start_link_train(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(intel_dp->base.base.crtc);
int i;
uint8_t voltage;
bool clock_recovery = false;
int voltage_tries, loop_tries;
uint32_t DP = intel_dp->DP;
/*
* On CPT we have to enable the port in training pattern 1, which
* will happen below in intel_dp_set_link_train. Otherwise, enable
* the port and wait for it to become active.
*/
if (!HAS_PCH_CPT(dev)) {
I915_WRITE(intel_dp->output_reg, intel_dp->DP);
POSTING_READ(intel_dp->output_reg);
intel_wait_for_vblank(dev, intel_crtc->pipe);
}
/* Write the link configuration data */
intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET,
intel_dp->link_configuration,
DP_LINK_CONFIGURATION_SIZE);
DP |= DP_PORT_EN;
memset(intel_dp->train_set, 0, 4);
voltage = 0xff;
voltage_tries = 0;
loop_tries = 0;
clock_recovery = false;
for (;;) {
/* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
uint8_t link_status[DP_LINK_STATUS_SIZE];
uint32_t signal_levels;
if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
} else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]);
DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels;
} else {
signal_levels = intel_dp_signal_levels(intel_dp->train_set[0]);
DRM_DEBUG_KMS("training pattern 1 signal levels %08x\n", signal_levels);
DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
}
if (!intel_dp_set_link_train(intel_dp, DP,
DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE))
break;
/* Set training pattern 1 */
udelay(100);
if (!intel_dp_get_link_status(intel_dp, link_status)) {
DRM_ERROR("failed to get link status\n");
break;
}
if (intel_clock_recovery_ok(link_status, intel_dp->lane_count)) {
DRM_DEBUG_KMS("clock recovery OK\n");
clock_recovery = true;
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 && voltage_tries == 5) {
++loop_tries;
if (loop_tries == 5) {
DRM_DEBUG_KMS("too many full retries, give up\n");
break;
}
memset(intel_dp->train_set, 0, 4);
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_DEBUG_KMS("too many voltage retries, give up\n");
break;
}
} else
voltage_tries = 0;
voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
/* Compute new intel_dp->train_set as requested by target */
intel_get_adjust_train(intel_dp, link_status);
}
intel_dp->DP = DP;
}
static void
intel_dp_complete_link_train(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
bool channel_eq = false;
int tries, cr_tries;
uint32_t DP = intel_dp->DP;
/* channel equalization */
tries = 0;
cr_tries = 0;
channel_eq = false;
for (;;) {
/* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
uint32_t signal_levels;
uint8_t link_status[DP_LINK_STATUS_SIZE];
if (cr_tries > 5) {
DRM_ERROR("failed to train DP, aborting\n");
intel_dp_link_down(intel_dp);
break;
}
if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
} else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]);
DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels;
} else {
signal_levels = intel_dp_signal_levels(intel_dp->train_set[0]);
DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
}
/* channel eq pattern */
if (!intel_dp_set_link_train(intel_dp, DP,
DP_TRAINING_PATTERN_2 |
DP_LINK_SCRAMBLING_DISABLE))
break;
udelay(400);
if (!intel_dp_get_link_status(intel_dp, link_status))
break;
/* Make sure clock is still ok */
if (!intel_clock_recovery_ok(link_status, intel_dp->lane_count)) {
intel_dp_start_link_train(intel_dp);
cr_tries++;
continue;
}
if (intel_channel_eq_ok(intel_dp, link_status)) {
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);
tries = 0;
cr_tries++;
continue;
}
/* Compute new intel_dp->train_set as requested by target */
intel_get_adjust_train(intel_dp, link_status);
++tries;
}
intel_dp_set_link_train(intel_dp, DP, DP_TRAINING_PATTERN_DISABLE);
}
static void
intel_dp_link_down(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t DP = intel_dp->DP;
if ((I915_READ(intel_dp->output_reg) & DP_PORT_EN) == 0)
return;
DRM_DEBUG_KMS("\n");
if (is_edp(intel_dp)) {
DP &= ~DP_PLL_ENABLE;
I915_WRITE(intel_dp->output_reg, DP);
POSTING_READ(intel_dp->output_reg);
udelay(100);
}
if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || !is_cpu_edp(intel_dp))) {
DP &= ~DP_LINK_TRAIN_MASK_CPT;
I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE_CPT);
} else {
DP &= ~DP_LINK_TRAIN_MASK;
I915_WRITE(intel_dp->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
}
POSTING_READ(intel_dp->output_reg);
msleep(17);
if (is_edp(intel_dp)) {
if (HAS_PCH_CPT(dev) && (IS_GEN7(dev) || !is_cpu_edp(intel_dp)))
DP |= DP_LINK_TRAIN_OFF_CPT;
else
DP |= DP_LINK_TRAIN_OFF;
}
if (HAS_PCH_IBX(dev) &&
I915_READ(intel_dp->output_reg) & DP_PIPEB_SELECT) {
struct drm_crtc *crtc = intel_dp->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 (crtc == NULL) {
/* We can arrive here never having been attached
* to a CRTC, for instance, due to inheriting
* random state from the BIOS.
*
* If the pipe is not running, play safe and
* wait for the clocks to stabilise before
* continuing.
*/
POSTING_READ(intel_dp->output_reg);
msleep(50);
} else
intel_wait_for_vblank(dev, to_intel_crtc(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)
{
if (intel_dp_aux_native_read_retry(intel_dp, 0x000, intel_dp->dpcd,
sizeof(intel_dp->dpcd)) &&
(intel_dp->dpcd[DP_DPCD_REV] != 0)) {
return true;
}
return false;
}
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;
ironlake_edp_panel_vdd_on(intel_dp);
if (intel_dp_aux_native_read_retry(intel_dp, DP_SINK_OUI, buf, 3))
DRM_DEBUG_KMS("Sink OUI: %02hx%02hx%02hx\n",
buf[0], buf[1], buf[2]);
if (intel_dp_aux_native_read_retry(intel_dp, DP_BRANCH_OUI, buf, 3))
DRM_DEBUG_KMS("Branch OUI: %02hx%02hx%02hx\n",
buf[0], buf[1], buf[2]);
ironlake_edp_panel_vdd_off(intel_dp, false);
}
static bool
intel_dp_get_sink_irq(struct intel_dp *intel_dp, u8 *sink_irq_vector)
{
int ret;
ret = intel_dp_aux_native_read_retry(intel_dp,
DP_DEVICE_SERVICE_IRQ_VECTOR,
sink_irq_vector, 1);
if (!ret)
return false;
return true;
}
static void
intel_dp_handle_test_request(struct intel_dp *intel_dp)
{
/* NAK by default */
intel_dp_aux_native_write_1(intel_dp, DP_TEST_RESPONSE, DP_TEST_ACK);
}
/*
* 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
*/
static void
intel_dp_check_link_status(struct intel_dp *intel_dp)
{
u8 sink_irq_vector;
u8 link_status[DP_LINK_STATUS_SIZE];
if (!intel_dp->base.connectors_active)
return;
if (WARN_ON(!intel_dp->base.base.crtc))
return;
/* Try to read receiver status if the link appears to be up */
if (!intel_dp_get_link_status(intel_dp, link_status)) {
intel_dp_link_down(intel_dp);
return;
}
/* Now read the DPCD to see if it's actually running */
if (!intel_dp_get_dpcd(intel_dp)) {
intel_dp_link_down(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 */
intel_dp_aux_native_write_1(intel_dp,
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 (!intel_channel_eq_ok(intel_dp, link_status)) {
DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
drm_get_encoder_name(&intel_dp->base.base));
intel_dp_start_link_train(intel_dp);
intel_dp_complete_link_train(intel_dp);
}
}
static enum drm_connector_status
intel_dp_detect_dpcd(struct intel_dp *intel_dp)
{
if (intel_dp_get_dpcd(intel_dp))
return connector_status_connected;
return connector_status_disconnected;
}
static enum drm_connector_status
ironlake_dp_detect(struct intel_dp *intel_dp)
{
enum drm_connector_status status;
/* Can't disconnect eDP, but you can close the lid... */
if (is_edp(intel_dp)) {
status = intel_panel_detect(intel_dp->base.base.dev);
if (status == connector_status_unknown)
status = connector_status_connected;
return status;
}
return intel_dp_detect_dpcd(intel_dp);
}
static enum drm_connector_status
g4x_dp_detect(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t bit;
switch (intel_dp->output_reg) {
case DP_B:
bit = DPB_HOTPLUG_LIVE_STATUS;
break;
case DP_C:
bit = DPC_HOTPLUG_LIVE_STATUS;
break;
case DP_D:
bit = DPD_HOTPLUG_LIVE_STATUS;
break;
default:
return connector_status_unknown;
}
if ((I915_READ(PORT_HOTPLUG_STAT) & bit) == 0)
return connector_status_disconnected;
return intel_dp_detect_dpcd(intel_dp);
}
static struct edid *
intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct edid *edid;
int size;
if (is_edp(intel_dp)) {
if (!intel_dp->edid)
return NULL;
size = (intel_dp->edid->extensions + 1) * EDID_LENGTH;
edid = kmalloc(size, GFP_KERNEL);
if (!edid)
return NULL;
memcpy(edid, intel_dp->edid, size);
return edid;
}
edid = drm_get_edid(connector, adapter);
return edid;
}
static int
intel_dp_get_edid_modes(struct drm_connector *connector, struct i2c_adapter *adapter)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
int ret;
if (is_edp(intel_dp)) {
drm_mode_connector_update_edid_property(connector,
intel_dp->edid);
ret = drm_add_edid_modes(connector, intel_dp->edid);
drm_edid_to_eld(connector,
intel_dp->edid);
return intel_dp->edid_mode_count;
}
ret = intel_ddc_get_modes(connector, adapter);
return ret;
}
/**
* Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
*
* \return true if DP port is connected.
* \return false if DP port is disconnected.
*/
static enum drm_connector_status
intel_dp_detect(struct drm_connector *connector, bool force)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct drm_device *dev = intel_dp->base.base.dev;
enum drm_connector_status status;
struct edid *edid = NULL;
intel_dp->has_audio = false;
if (HAS_PCH_SPLIT(dev))
status = ironlake_dp_detect(intel_dp);
else
status = g4x_dp_detect(intel_dp);
DRM_DEBUG_KMS("DPCD: %02hx%02hx%02hx%02hx%02hx%02hx%02hx%02hx\n",
intel_dp->dpcd[0], intel_dp->dpcd[1], intel_dp->dpcd[2],
intel_dp->dpcd[3], intel_dp->dpcd[4], intel_dp->dpcd[5],
intel_dp->dpcd[6], intel_dp->dpcd[7]);
if (status != connector_status_connected)
return status;
intel_dp_probe_oui(intel_dp);
if (intel_dp->force_audio != HDMI_AUDIO_AUTO) {
intel_dp->has_audio = (intel_dp->force_audio == HDMI_AUDIO_ON);
} else {
edid = intel_dp_get_edid(connector, &intel_dp->adapter);
if (edid) {
intel_dp->has_audio = drm_detect_monitor_audio(edid);
kfree(edid);
}
}
return connector_status_connected;
}
static int intel_dp_get_modes(struct drm_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct drm_device *dev = intel_dp->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
int ret;
/* We should parse the EDID data and find out if it has an audio sink
*/
ret = intel_dp_get_edid_modes(connector, &intel_dp->adapter);
if (ret) {
if (is_edp(intel_dp) && !intel_dp->panel_fixed_mode) {
struct drm_display_mode *newmode;
list_for_each_entry(newmode, &connector->probed_modes,
head) {
if ((newmode->type & DRM_MODE_TYPE_PREFERRED)) {
intel_dp->panel_fixed_mode =
drm_mode_duplicate(dev, newmode);
break;
}
}
}
return ret;
}
/* if eDP has no EDID, try to use fixed panel mode from VBT */
if (is_edp(intel_dp)) {
/* initialize panel mode from VBT if available for eDP */
if (intel_dp->panel_fixed_mode == NULL && dev_priv->lfp_lvds_vbt_mode != NULL) {
intel_dp->panel_fixed_mode =
drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
if (intel_dp->panel_fixed_mode) {
intel_dp->panel_fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
}
}
if (intel_dp->panel_fixed_mode) {
struct drm_display_mode *mode;
mode = drm_mode_duplicate(dev, intel_dp->panel_fixed_mode);
drm_mode_probed_add(connector, mode);
return 1;
}
}
return 0;
}
static bool
intel_dp_detect_audio(struct drm_connector *connector)
{
struct intel_dp *intel_dp = intel_attached_dp(connector);
struct edid *edid;
bool has_audio = false;
edid = intel_dp_get_edid(connector, &intel_dp->adapter);
if (edid) {
has_audio = drm_detect_monitor_audio(edid);
kfree(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_dp *intel_dp = intel_attached_dp(connector);
int ret;
ret = drm_connector_property_set_value(connector, 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) {
if (val == !!intel_dp->color_range)
return 0;
intel_dp->color_range = val ? DP_COLOR_RANGE_16_235 : 0;
goto done;
}
return -EINVAL;
done:
if (intel_dp->base.base.crtc) {
struct drm_crtc *crtc = intel_dp->base.base.crtc;
intel_set_mode(crtc, &crtc->mode,
crtc->x, crtc->y, crtc->fb);
}
return 0;
}
static void
intel_dp_destroy(struct drm_connector *connector)
{
struct drm_device *dev = connector->dev;
if (intel_dpd_is_edp(dev))
intel_panel_destroy_backlight(dev);
drm_sysfs_connector_remove(connector);
drm_connector_cleanup(connector);
kfree(connector);
}
static void intel_dp_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
i2c_del_adapter(&intel_dp->adapter);
drm_encoder_cleanup(encoder);
if (is_edp(intel_dp)) {
kfree(intel_dp->edid);
cancel_delayed_work_sync(&intel_dp->panel_vdd_work);
ironlake_panel_vdd_off_sync(intel_dp);
}
kfree(intel_dp);
}
static const struct drm_encoder_helper_funcs intel_dp_helper_funcs = {
.mode_fixup = intel_dp_mode_fixup,
.mode_set = intel_dp_mode_set,
.disable = intel_encoder_noop,
};
static const struct drm_connector_funcs intel_dp_connector_funcs = {
.dpms = intel_dp_dpms,
.detect = intel_dp_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.set_property = intel_dp_set_property,
.destroy = intel_dp_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 = {
.destroy = intel_dp_encoder_destroy,
};
static void
intel_dp_hot_plug(struct intel_encoder *intel_encoder)
{
struct intel_dp *intel_dp = container_of(intel_encoder, struct intel_dp, base);
intel_dp_check_link_status(intel_dp);
}
/* 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 *encoder;
for_each_encoder_on_crtc(dev, crtc, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
if (intel_dp->base.type == INTEL_OUTPUT_DISPLAYPORT ||
intel_dp->base.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_dpd_is_edp(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct child_device_config *p_child;
int i;
if (!dev_priv->child_dev_num)
return false;
for (i = 0; i < dev_priv->child_dev_num; i++) {
p_child = dev_priv->child_dev + i;
if (p_child->dvo_port == PORT_IDPD &&
p_child->device_type == DEVICE_TYPE_eDP)
return true;
}
return false;
}
static void
intel_dp_add_properties(struct intel_dp *intel_dp, struct drm_connector *connector)
{
intel_attach_force_audio_property(connector);
intel_attach_broadcast_rgb_property(connector);
}
void
intel_dp_init(struct drm_device *dev, int output_reg, enum port port)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_connector *connector;
struct intel_dp *intel_dp;
struct intel_encoder *intel_encoder;
struct intel_connector *intel_connector;
const char *name = NULL;
int type;
intel_dp = kzalloc(sizeof(struct intel_dp), GFP_KERNEL);
if (!intel_dp)
return;
intel_dp->output_reg = output_reg;
intel_dp->port = port;
intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
if (!intel_connector) {
kfree(intel_dp);
return;
}
intel_encoder = &intel_dp->base;
if (HAS_PCH_SPLIT(dev) && output_reg == PCH_DP_D)
if (intel_dpd_is_edp(dev))
intel_dp->is_pch_edp = true;
if (output_reg == DP_A || is_pch_edp(intel_dp)) {
type = DRM_MODE_CONNECTOR_eDP;
intel_encoder->type = INTEL_OUTPUT_EDP;
} else {
type = DRM_MODE_CONNECTOR_DisplayPort;
intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
}
connector = &intel_connector->base;
drm_connector_init(dev, connector, &intel_dp_connector_funcs, type);
drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
connector->polled = DRM_CONNECTOR_POLL_HPD;
intel_encoder->cloneable = false;
INIT_DELAYED_WORK(&intel_dp->panel_vdd_work,
ironlake_panel_vdd_work);
intel_encoder->crtc_mask = (1 << 0) | (1 << 1) | (1 << 2);
connector->interlace_allowed = true;
connector->doublescan_allowed = 0;
drm_encoder_init(dev, &intel_encoder->base, &intel_dp_enc_funcs,
DRM_MODE_ENCODER_TMDS);
drm_encoder_helper_add(&intel_encoder->base, &intel_dp_helper_funcs);
intel_connector_attach_encoder(intel_connector, intel_encoder);
drm_sysfs_connector_add(connector);
intel_encoder->enable = intel_enable_dp;
intel_encoder->disable = intel_disable_dp;
intel_encoder->get_hw_state = intel_dp_get_hw_state;
intel_connector->get_hw_state = intel_connector_get_hw_state;
/* Set up the DDC bus. */
switch (port) {
case PORT_A:
name = "DPDDC-A";
break;
case PORT_B:
dev_priv->hotplug_supported_mask |= DPB_HOTPLUG_INT_STATUS;
name = "DPDDC-B";
break;
case PORT_C:
dev_priv->hotplug_supported_mask |= DPC_HOTPLUG_INT_STATUS;
name = "DPDDC-C";
break;
case PORT_D:
dev_priv->hotplug_supported_mask |= DPD_HOTPLUG_INT_STATUS;
name = "DPDDC-D";
break;
default:
WARN(1, "Invalid port %c\n", port_name(port));
break;
}
intel_dp_i2c_init(intel_dp, intel_connector, name);
/* Cache some DPCD data in the eDP case */
if (is_edp(intel_dp)) {
bool ret;
struct edp_power_seq cur, vbt;
u32 pp_on, pp_off, pp_div;
struct edid *edid;
pp_on = I915_READ(PCH_PP_ON_DELAYS);
pp_off = I915_READ(PCH_PP_OFF_DELAYS);
pp_div = I915_READ(PCH_PP_DIVISOR);
if (!pp_on || !pp_off || !pp_div) {
DRM_INFO("bad panel power sequencing delays, disabling panel\n");
intel_dp_encoder_destroy(&intel_dp->base.base);
intel_dp_destroy(&intel_connector->base);
return;
}
/* 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->edp.pps;
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);
#define get_delay(field) ((max(cur.field, vbt.field) + 9) / 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);
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);
ironlake_edp_panel_vdd_on(intel_dp);
ret = intel_dp_get_dpcd(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, false);
if (ret) {
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");
intel_dp_encoder_destroy(&intel_dp->base.base);
intel_dp_destroy(&intel_connector->base);
return;
}
ironlake_edp_panel_vdd_on(intel_dp);
edid = drm_get_edid(connector, &intel_dp->adapter);
if (edid) {
drm_mode_connector_update_edid_property(connector,
edid);
intel_dp->edid_mode_count =
drm_add_edid_modes(connector, edid);
drm_edid_to_eld(connector, edid);
intel_dp->edid = edid;
}
ironlake_edp_panel_vdd_off(intel_dp, false);
}
intel_encoder->hot_plug = intel_dp_hot_plug;
if (is_edp(intel_dp)) {
dev_priv->int_edp_connector = connector;
intel_panel_setup_backlight(dev);
}
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);
}
}
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