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linux/drivers/gpu/drm/i915/intel_cdclk.c
Paulo Zanoni 9378985eb0 drm/i915/icl: implement DVFS for ICL 
ICL DVFS is almost the same as CNL, except for the CDCLK/DDICLK
table. Implement it just like CNL does.

References: commit 48469eced2 ("drm/i915: Use cdclk_state->voltage
 on CNL")
References: commit 53e9bf5e81 ("drm/i915: Adjust system agent
 voltage on CNL if required by DDI ports")
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180614221018.19044-1-paulo.r.zanoni@intel.com
2018-06-15 15:06:00 -07:00

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/*
* Copyright © 2006-2017 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.
*/
#include "intel_drv.h"
/**
* DOC: CDCLK / RAWCLK
*
* The display engine uses several different clocks to do its work. There
* are two main clocks involved that aren't directly related to the actual
* pixel clock or any symbol/bit clock of the actual output port. These
* are the core display clock (CDCLK) and RAWCLK.
*
* CDCLK clocks most of the display pipe logic, and thus its frequency
* must be high enough to support the rate at which pixels are flowing
* through the pipes. Downscaling must also be accounted as that increases
* the effective pixel rate.
*
* On several platforms the CDCLK frequency can be changed dynamically
* to minimize power consumption for a given display configuration.
* Typically changes to the CDCLK frequency require all the display pipes
* to be shut down while the frequency is being changed.
*
* On SKL+ the DMC will toggle the CDCLK off/on during DC5/6 entry/exit.
* DMC will not change the active CDCLK frequency however, so that part
* will still be performed by the driver directly.
*
* RAWCLK is a fixed frequency clock, often used by various auxiliary
* blocks such as AUX CH or backlight PWM. Hence the only thing we
* really need to know about RAWCLK is its frequency so that various
* dividers can be programmed correctly.
*/
static void fixed_133mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 133333;
}
static void fixed_200mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 200000;
}
static void fixed_266mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 266667;
}
static void fixed_333mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 333333;
}
static void fixed_400mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 400000;
}
static void fixed_450mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
cdclk_state->cdclk = 450000;
}
static void i85x_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
u16 hpllcc = 0;
/*
* 852GM/852GMV only supports 133 MHz and the HPLLCC
* encoding is different :(
* FIXME is this the right way to detect 852GM/852GMV?
*/
if (pdev->revision == 0x1) {
cdclk_state->cdclk = 133333;
return;
}
pci_bus_read_config_word(pdev->bus,
PCI_DEVFN(0, 3), HPLLCC, &hpllcc);
/* Assume that the hardware is in the high speed state. This
* should be the default.
*/
switch (hpllcc & GC_CLOCK_CONTROL_MASK) {
case GC_CLOCK_133_200:
case GC_CLOCK_133_200_2:
case GC_CLOCK_100_200:
cdclk_state->cdclk = 200000;
break;
case GC_CLOCK_166_250:
cdclk_state->cdclk = 250000;
break;
case GC_CLOCK_100_133:
cdclk_state->cdclk = 133333;
break;
case GC_CLOCK_133_266:
case GC_CLOCK_133_266_2:
case GC_CLOCK_166_266:
cdclk_state->cdclk = 266667;
break;
}
}
static void i915gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
cdclk_state->cdclk = 133333;
return;
}
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_333_320_MHZ:
cdclk_state->cdclk = 333333;
break;
default:
case GC_DISPLAY_CLOCK_190_200_MHZ:
cdclk_state->cdclk = 190000;
break;
}
}
static void i945gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
cdclk_state->cdclk = 133333;
return;
}
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_333_320_MHZ:
cdclk_state->cdclk = 320000;
break;
default:
case GC_DISPLAY_CLOCK_190_200_MHZ:
cdclk_state->cdclk = 200000;
break;
}
}
static unsigned int intel_hpll_vco(struct drm_i915_private *dev_priv)
{
static const unsigned int blb_vco[8] = {
[0] = 3200000,
[1] = 4000000,
[2] = 5333333,
[3] = 4800000,
[4] = 6400000,
};
static const unsigned int pnv_vco[8] = {
[0] = 3200000,
[1] = 4000000,
[2] = 5333333,
[3] = 4800000,
[4] = 2666667,
};
static const unsigned int cl_vco[8] = {
[0] = 3200000,
[1] = 4000000,
[2] = 5333333,
[3] = 6400000,
[4] = 3333333,
[5] = 3566667,
[6] = 4266667,
};
static const unsigned int elk_vco[8] = {
[0] = 3200000,
[1] = 4000000,
[2] = 5333333,
[3] = 4800000,
};
static const unsigned int ctg_vco[8] = {
[0] = 3200000,
[1] = 4000000,
[2] = 5333333,
[3] = 6400000,
[4] = 2666667,
[5] = 4266667,
};
const unsigned int *vco_table;
unsigned int vco;
uint8_t tmp = 0;
/* FIXME other chipsets? */
if (IS_GM45(dev_priv))
vco_table = ctg_vco;
else if (IS_G45(dev_priv))
vco_table = elk_vco;
else if (IS_I965GM(dev_priv))
vco_table = cl_vco;
else if (IS_PINEVIEW(dev_priv))
vco_table = pnv_vco;
else if (IS_G33(dev_priv))
vco_table = blb_vco;
else
return 0;
tmp = I915_READ(IS_MOBILE(dev_priv) ? HPLLVCO_MOBILE : HPLLVCO);
vco = vco_table[tmp & 0x7];
if (vco == 0)
DRM_ERROR("Bad HPLL VCO (HPLLVCO=0x%02x)\n", tmp);
else
DRM_DEBUG_KMS("HPLL VCO %u kHz\n", vco);
return vco;
}
static void g33_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
static const uint8_t div_3200[] = { 12, 10, 8, 7, 5, 16 };
static const uint8_t div_4000[] = { 14, 12, 10, 8, 6, 20 };
static const uint8_t div_4800[] = { 20, 14, 12, 10, 8, 24 };
static const uint8_t div_5333[] = { 20, 16, 12, 12, 8, 28 };
const uint8_t *div_table;
unsigned int cdclk_sel;
uint16_t tmp = 0;
cdclk_state->vco = intel_hpll_vco(dev_priv);
pci_read_config_word(pdev, GCFGC, &tmp);
cdclk_sel = (tmp >> 4) & 0x7;
if (cdclk_sel >= ARRAY_SIZE(div_3200))
goto fail;
switch (cdclk_state->vco) {
case 3200000:
div_table = div_3200;
break;
case 4000000:
div_table = div_4000;
break;
case 4800000:
div_table = div_4800;
break;
case 5333333:
div_table = div_5333;
break;
default:
goto fail;
}
cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco,
div_table[cdclk_sel]);
return;
fail:
DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%08x\n",
cdclk_state->vco, tmp);
cdclk_state->cdclk = 190476;
}
static void pnv_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_267_MHZ_PNV:
cdclk_state->cdclk = 266667;
break;
case GC_DISPLAY_CLOCK_333_MHZ_PNV:
cdclk_state->cdclk = 333333;
break;
case GC_DISPLAY_CLOCK_444_MHZ_PNV:
cdclk_state->cdclk = 444444;
break;
case GC_DISPLAY_CLOCK_200_MHZ_PNV:
cdclk_state->cdclk = 200000;
break;
default:
DRM_ERROR("Unknown pnv display core clock 0x%04x\n", gcfgc);
case GC_DISPLAY_CLOCK_133_MHZ_PNV:
cdclk_state->cdclk = 133333;
break;
case GC_DISPLAY_CLOCK_167_MHZ_PNV:
cdclk_state->cdclk = 166667;
break;
}
}
static void i965gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
static const uint8_t div_3200[] = { 16, 10, 8 };
static const uint8_t div_4000[] = { 20, 12, 10 };
static const uint8_t div_5333[] = { 24, 16, 14 };
const uint8_t *div_table;
unsigned int cdclk_sel;
uint16_t tmp = 0;
cdclk_state->vco = intel_hpll_vco(dev_priv);
pci_read_config_word(pdev, GCFGC, &tmp);
cdclk_sel = ((tmp >> 8) & 0x1f) - 1;
if (cdclk_sel >= ARRAY_SIZE(div_3200))
goto fail;
switch (cdclk_state->vco) {
case 3200000:
div_table = div_3200;
break;
case 4000000:
div_table = div_4000;
break;
case 5333333:
div_table = div_5333;
break;
default:
goto fail;
}
cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco,
div_table[cdclk_sel]);
return;
fail:
DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%04x\n",
cdclk_state->vco, tmp);
cdclk_state->cdclk = 200000;
}
static void gm45_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
struct pci_dev *pdev = dev_priv->drm.pdev;
unsigned int cdclk_sel;
uint16_t tmp = 0;
cdclk_state->vco = intel_hpll_vco(dev_priv);
pci_read_config_word(pdev, GCFGC, &tmp);
cdclk_sel = (tmp >> 12) & 0x1;
switch (cdclk_state->vco) {
case 2666667:
case 4000000:
case 5333333:
cdclk_state->cdclk = cdclk_sel ? 333333 : 222222;
break;
case 3200000:
cdclk_state->cdclk = cdclk_sel ? 320000 : 228571;
break;
default:
DRM_ERROR("Unable to determine CDCLK. HPLL VCO=%u, CFGC=0x%04x\n",
cdclk_state->vco, tmp);
cdclk_state->cdclk = 222222;
break;
}
}
static void hsw_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
uint32_t lcpll = I915_READ(LCPLL_CTL);
uint32_t freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_state->cdclk = 800000;
else if (I915_READ(FUSE_STRAP) & HSW_CDCLK_LIMIT)
cdclk_state->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_450)
cdclk_state->cdclk = 450000;
else if (IS_HSW_ULT(dev_priv))
cdclk_state->cdclk = 337500;
else
cdclk_state->cdclk = 540000;
}
static int vlv_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk)
{
int freq_320 = (dev_priv->hpll_freq << 1) % 320000 != 0 ?
333333 : 320000;
/*
* We seem to get an unstable or solid color picture at 200MHz.
* Not sure what's wrong. For now use 200MHz only when all pipes
* are off.
*/
if (IS_VALLEYVIEW(dev_priv) && min_cdclk > freq_320)
return 400000;
else if (min_cdclk > 266667)
return freq_320;
else if (min_cdclk > 0)
return 266667;
else
return 200000;
}
static u8 vlv_calc_voltage_level(struct drm_i915_private *dev_priv, int cdclk)
{
if (IS_VALLEYVIEW(dev_priv)) {
if (cdclk >= 320000) /* jump to highest voltage for 400MHz too */
return 2;
else if (cdclk >= 266667)
return 1;
else
return 0;
} else {
/*
* Specs are full of misinformation, but testing on actual
* hardware has shown that we just need to write the desired
* CCK divider into the Punit register.
*/
return DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, cdclk) - 1;
}
}
static void vlv_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 val;
cdclk_state->vco = vlv_get_hpll_vco(dev_priv);
cdclk_state->cdclk = vlv_get_cck_clock(dev_priv, "cdclk",
CCK_DISPLAY_CLOCK_CONTROL,
cdclk_state->vco);
mutex_lock(&dev_priv->pcu_lock);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
mutex_unlock(&dev_priv->pcu_lock);
if (IS_VALLEYVIEW(dev_priv))
cdclk_state->voltage_level = (val & DSPFREQGUAR_MASK) >>
DSPFREQGUAR_SHIFT;
else
cdclk_state->voltage_level = (val & DSPFREQGUAR_MASK_CHV) >>
DSPFREQGUAR_SHIFT_CHV;
}
static void vlv_program_pfi_credits(struct drm_i915_private *dev_priv)
{
unsigned int credits, default_credits;
if (IS_CHERRYVIEW(dev_priv))
default_credits = PFI_CREDIT(12);
else
default_credits = PFI_CREDIT(8);
if (dev_priv->cdclk.hw.cdclk >= dev_priv->czclk_freq) {
/* CHV suggested value is 31 or 63 */
if (IS_CHERRYVIEW(dev_priv))
credits = PFI_CREDIT_63;
else
credits = PFI_CREDIT(15);
} else {
credits = default_credits;
}
/*
* WA - write default credits before re-programming
* FIXME: should we also set the resend bit here?
*/
I915_WRITE(GCI_CONTROL, VGA_FAST_MODE_DISABLE |
default_credits);
I915_WRITE(GCI_CONTROL, VGA_FAST_MODE_DISABLE |
credits | PFI_CREDIT_RESEND);
/*
* FIXME is this guaranteed to clear
* immediately or should we poll for it?
*/
WARN_ON(I915_READ(GCI_CONTROL) & PFI_CREDIT_RESEND);
}
static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
u32 val, cmd = cdclk_state->voltage_level;
switch (cdclk) {
case 400000:
case 333333:
case 320000:
case 266667:
case 200000:
break;
default:
MISSING_CASE(cdclk);
return;
}
/* There are cases where we can end up here with power domains
* off and a CDCLK frequency other than the minimum, like when
* issuing a modeset without actually changing any display after
* a system suspend. So grab the PIPE-A domain, which covers
* the HW blocks needed for the following programming.
*/
intel_display_power_get(dev_priv, POWER_DOMAIN_PIPE_A);
mutex_lock(&dev_priv->pcu_lock);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
val &= ~DSPFREQGUAR_MASK;
val |= (cmd << DSPFREQGUAR_SHIFT);
vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) &
DSPFREQSTAT_MASK) == (cmd << DSPFREQSTAT_SHIFT),
50)) {
DRM_ERROR("timed out waiting for CDclk change\n");
}
mutex_unlock(&dev_priv->pcu_lock);
mutex_lock(&dev_priv->sb_lock);
if (cdclk == 400000) {
u32 divider;
divider = DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1,
cdclk) - 1;
/* adjust cdclk divider */
val = vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL);
val &= ~CCK_FREQUENCY_VALUES;
val |= divider;
vlv_cck_write(dev_priv, CCK_DISPLAY_CLOCK_CONTROL, val);
if (wait_for((vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL) &
CCK_FREQUENCY_STATUS) == (divider << CCK_FREQUENCY_STATUS_SHIFT),
50))
DRM_ERROR("timed out waiting for CDclk change\n");
}
/* adjust self-refresh exit latency value */
val = vlv_bunit_read(dev_priv, BUNIT_REG_BISOC);
val &= ~0x7f;
/*
* For high bandwidth configs, we set a higher latency in the bunit
* so that the core display fetch happens in time to avoid underruns.
*/
if (cdclk == 400000)
val |= 4500 / 250; /* 4.5 usec */
else
val |= 3000 / 250; /* 3.0 usec */
vlv_bunit_write(dev_priv, BUNIT_REG_BISOC, val);
mutex_unlock(&dev_priv->sb_lock);
intel_update_cdclk(dev_priv);
vlv_program_pfi_credits(dev_priv);
intel_display_power_put(dev_priv, POWER_DOMAIN_PIPE_A);
}
static void chv_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
u32 val, cmd = cdclk_state->voltage_level;
switch (cdclk) {
case 333333:
case 320000:
case 266667:
case 200000:
break;
default:
MISSING_CASE(cdclk);
return;
}
/* There are cases where we can end up here with power domains
* off and a CDCLK frequency other than the minimum, like when
* issuing a modeset without actually changing any display after
* a system suspend. So grab the PIPE-A domain, which covers
* the HW blocks needed for the following programming.
*/
intel_display_power_get(dev_priv, POWER_DOMAIN_PIPE_A);
mutex_lock(&dev_priv->pcu_lock);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ);
val &= ~DSPFREQGUAR_MASK_CHV;
val |= (cmd << DSPFREQGUAR_SHIFT_CHV);
vlv_punit_write(dev_priv, PUNIT_REG_DSPFREQ, val);
if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPFREQ) &
DSPFREQSTAT_MASK_CHV) == (cmd << DSPFREQSTAT_SHIFT_CHV),
50)) {
DRM_ERROR("timed out waiting for CDclk change\n");
}
mutex_unlock(&dev_priv->pcu_lock);
intel_update_cdclk(dev_priv);
vlv_program_pfi_credits(dev_priv);
intel_display_power_put(dev_priv, POWER_DOMAIN_PIPE_A);
}
static int bdw_calc_cdclk(int min_cdclk)
{
if (min_cdclk > 540000)
return 675000;
else if (min_cdclk > 450000)
return 540000;
else if (min_cdclk > 337500)
return 450000;
else
return 337500;
}
static u8 bdw_calc_voltage_level(int cdclk)
{
switch (cdclk) {
default:
case 337500:
return 2;
case 450000:
return 0;
case 540000:
return 1;
case 675000:
return 3;
}
}
static void bdw_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
uint32_t lcpll = I915_READ(LCPLL_CTL);
uint32_t freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_state->cdclk = 800000;
else if (I915_READ(FUSE_STRAP) & HSW_CDCLK_LIMIT)
cdclk_state->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_450)
cdclk_state->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_54O_BDW)
cdclk_state->cdclk = 540000;
else if (freq == LCPLL_CLK_FREQ_337_5_BDW)
cdclk_state->cdclk = 337500;
else
cdclk_state->cdclk = 675000;
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_state->voltage_level =
bdw_calc_voltage_level(cdclk_state->cdclk);
}
static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
uint32_t val;
int ret;
if (WARN((I915_READ(LCPLL_CTL) &
(LCPLL_PLL_DISABLE | LCPLL_PLL_LOCK |
LCPLL_CD_CLOCK_DISABLE | LCPLL_ROOT_CD_CLOCK_DISABLE |
LCPLL_CD2X_CLOCK_DISABLE | LCPLL_POWER_DOWN_ALLOW |
LCPLL_CD_SOURCE_FCLK)) != LCPLL_PLL_LOCK,
"trying to change cdclk frequency with cdclk not enabled\n"))
return;
mutex_lock(&dev_priv->pcu_lock);
ret = sandybridge_pcode_write(dev_priv,
BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("failed to inform pcode about cdclk change\n");
return;
}
val = I915_READ(LCPLL_CTL);
val |= LCPLL_CD_SOURCE_FCLK;
I915_WRITE(LCPLL_CTL, val);
/*
* According to the spec, it should be enough to poll for this 1 us.
* However, extensive testing shows that this can take longer.
*/
if (wait_for_us(I915_READ(LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE, 100))
DRM_ERROR("Switching to FCLK failed\n");
val = I915_READ(LCPLL_CTL);
val &= ~LCPLL_CLK_FREQ_MASK;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
/* fall through */
case 337500:
val |= LCPLL_CLK_FREQ_337_5_BDW;
break;
case 450000:
val |= LCPLL_CLK_FREQ_450;
break;
case 540000:
val |= LCPLL_CLK_FREQ_54O_BDW;
break;
case 675000:
val |= LCPLL_CLK_FREQ_675_BDW;
break;
}
I915_WRITE(LCPLL_CTL, val);
val = I915_READ(LCPLL_CTL);
val &= ~LCPLL_CD_SOURCE_FCLK;
I915_WRITE(LCPLL_CTL, val);
if (wait_for_us((I915_READ(LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
DRM_ERROR("Switching back to LCPLL failed\n");
mutex_lock(&dev_priv->pcu_lock);
sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_state->voltage_level);
mutex_unlock(&dev_priv->pcu_lock);
I915_WRITE(CDCLK_FREQ, DIV_ROUND_CLOSEST(cdclk, 1000) - 1);
intel_update_cdclk(dev_priv);
}
static int skl_calc_cdclk(int min_cdclk, int vco)
{
if (vco == 8640000) {
if (min_cdclk > 540000)
return 617143;
else if (min_cdclk > 432000)
return 540000;
else if (min_cdclk > 308571)
return 432000;
else
return 308571;
} else {
if (min_cdclk > 540000)
return 675000;
else if (min_cdclk > 450000)
return 540000;
else if (min_cdclk > 337500)
return 450000;
else
return 337500;
}
}
static u8 skl_calc_voltage_level(int cdclk)
{
switch (cdclk) {
default:
case 308571:
case 337500:
return 0;
case 450000:
case 432000:
return 1;
case 540000:
return 2;
case 617143:
case 675000:
return 3;
}
}
static void skl_dpll0_update(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 val;
cdclk_state->ref = 24000;
cdclk_state->vco = 0;
val = I915_READ(LCPLL1_CTL);
if ((val & LCPLL_PLL_ENABLE) == 0)
return;
if (WARN_ON((val & LCPLL_PLL_LOCK) == 0))
return;
val = I915_READ(DPLL_CTRL1);
if (WARN_ON((val & (DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
DPLL_CTRL1_SSC(SKL_DPLL0) |
DPLL_CTRL1_OVERRIDE(SKL_DPLL0))) !=
DPLL_CTRL1_OVERRIDE(SKL_DPLL0)))
return;
switch (val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0)) {
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0):
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1350, SKL_DPLL0):
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1620, SKL_DPLL0):
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2700, SKL_DPLL0):
cdclk_state->vco = 8100000;
break;
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, SKL_DPLL0):
case DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_2160, SKL_DPLL0):
cdclk_state->vco = 8640000;
break;
default:
MISSING_CASE(val & DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0));
break;
}
}
static void skl_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 cdctl;
skl_dpll0_update(dev_priv, cdclk_state);
cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
if (cdclk_state->vco == 0)
goto out;
cdctl = I915_READ(CDCLK_CTL);
if (cdclk_state->vco == 8640000) {
switch (cdctl & CDCLK_FREQ_SEL_MASK) {
case CDCLK_FREQ_450_432:
cdclk_state->cdclk = 432000;
break;
case CDCLK_FREQ_337_308:
cdclk_state->cdclk = 308571;
break;
case CDCLK_FREQ_540:
cdclk_state->cdclk = 540000;
break;
case CDCLK_FREQ_675_617:
cdclk_state->cdclk = 617143;
break;
default:
MISSING_CASE(cdctl & CDCLK_FREQ_SEL_MASK);
break;
}
} else {
switch (cdctl & CDCLK_FREQ_SEL_MASK) {
case CDCLK_FREQ_450_432:
cdclk_state->cdclk = 450000;
break;
case CDCLK_FREQ_337_308:
cdclk_state->cdclk = 337500;
break;
case CDCLK_FREQ_540:
cdclk_state->cdclk = 540000;
break;
case CDCLK_FREQ_675_617:
cdclk_state->cdclk = 675000;
break;
default:
MISSING_CASE(cdctl & CDCLK_FREQ_SEL_MASK);
break;
}
}
out:
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_state->voltage_level =
skl_calc_voltage_level(cdclk_state->cdclk);
}
/* convert from kHz to .1 fixpoint MHz with -1MHz offset */
static int skl_cdclk_decimal(int cdclk)
{
return DIV_ROUND_CLOSEST(cdclk - 1000, 500);
}
static void skl_set_preferred_cdclk_vco(struct drm_i915_private *dev_priv,
int vco)
{
bool changed = dev_priv->skl_preferred_vco_freq != vco;
dev_priv->skl_preferred_vco_freq = vco;
if (changed)
intel_update_max_cdclk(dev_priv);
}
static void skl_dpll0_enable(struct drm_i915_private *dev_priv, int vco)
{
u32 val;
WARN_ON(vco != 8100000 && vco != 8640000);
/*
* We always enable DPLL0 with the lowest link rate possible, but still
* taking into account the VCO required to operate the eDP panel at the
* desired frequency. The usual DP link rates operate with a VCO of
* 8100 while the eDP 1.4 alternate link rates need a VCO of 8640.
* The modeset code is responsible for the selection of the exact link
* rate later on, with the constraint of choosing a frequency that
* works with vco.
*/
val = I915_READ(DPLL_CTRL1);
val &= ~(DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) | DPLL_CTRL1_SSC(SKL_DPLL0) |
DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0));
val |= DPLL_CTRL1_OVERRIDE(SKL_DPLL0);
if (vco == 8640000)
val |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080,
SKL_DPLL0);
else
val |= DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810,
SKL_DPLL0);
I915_WRITE(DPLL_CTRL1, val);
POSTING_READ(DPLL_CTRL1);
I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) | LCPLL_PLL_ENABLE);
if (intel_wait_for_register(dev_priv,
LCPLL1_CTL, LCPLL_PLL_LOCK, LCPLL_PLL_LOCK,
5))
DRM_ERROR("DPLL0 not locked\n");
dev_priv->cdclk.hw.vco = vco;
/* We'll want to keep using the current vco from now on. */
skl_set_preferred_cdclk_vco(dev_priv, vco);
}
static void skl_dpll0_disable(struct drm_i915_private *dev_priv)
{
I915_WRITE(LCPLL1_CTL, I915_READ(LCPLL1_CTL) & ~LCPLL_PLL_ENABLE);
if (intel_wait_for_register(dev_priv,
LCPLL1_CTL, LCPLL_PLL_LOCK, 0,
1))
DRM_ERROR("Couldn't disable DPLL0\n");
dev_priv->cdclk.hw.vco = 0;
}
static void skl_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
u32 freq_select, cdclk_ctl;
int ret;
/*
* Based on WA#1183 CDCLK rates 308 and 617MHz CDCLK rates are
* unsupported on SKL. In theory this should never happen since only
* the eDP1.4 2.16 and 4.32Gbps rates require it, but eDP1.4 is not
* supported on SKL either, see the above WA. WARN whenever trying to
* use the corresponding VCO freq as that always leads to using the
* minimum 308MHz CDCLK.
*/
WARN_ON_ONCE(IS_SKYLAKE(dev_priv) && vco == 8640000);
mutex_lock(&dev_priv->pcu_lock);
ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
SKL_CDCLK_PREPARE_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE, 3);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
ret);
return;
}
/* Choose frequency for this cdclk */
switch (cdclk) {
default:
WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
WARN_ON(vco != 0);
/* fall through */
case 308571:
case 337500:
freq_select = CDCLK_FREQ_337_308;
break;
case 450000:
case 432000:
freq_select = CDCLK_FREQ_450_432;
break;
case 540000:
freq_select = CDCLK_FREQ_540;
break;
case 617143:
case 675000:
freq_select = CDCLK_FREQ_675_617;
break;
}
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
skl_dpll0_disable(dev_priv);
cdclk_ctl = I915_READ(CDCLK_CTL);
if (dev_priv->cdclk.hw.vco != vco) {
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
I915_WRITE(CDCLK_CTL, cdclk_ctl);
}
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
I915_WRITE(CDCLK_CTL, cdclk_ctl);
POSTING_READ(CDCLK_CTL);
if (dev_priv->cdclk.hw.vco != vco)
skl_dpll0_enable(dev_priv, vco);
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
I915_WRITE(CDCLK_CTL, cdclk_ctl);
cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
I915_WRITE(CDCLK_CTL, cdclk_ctl);
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
I915_WRITE(CDCLK_CTL, cdclk_ctl);
POSTING_READ(CDCLK_CTL);
/* inform PCU of the change */
mutex_lock(&dev_priv->pcu_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
cdclk_state->voltage_level);
mutex_unlock(&dev_priv->pcu_lock);
intel_update_cdclk(dev_priv);
}
static void skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
uint32_t cdctl, expected;
/*
* check if the pre-os initialized the display
* There is SWF18 scratchpad register defined which is set by the
* pre-os which can be used by the OS drivers to check the status
*/
if ((I915_READ(SWF_ILK(0x18)) & 0x00FFFFFF) == 0)
goto sanitize;
intel_update_cdclk(dev_priv);
intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
/* Is PLL enabled and locked ? */
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
goto sanitize;
/* DPLL okay; verify the cdclock
*
* Noticed in some instances that the freq selection is correct but
* decimal part is programmed wrong from BIOS where pre-os does not
* enable display. Verify the same as well.
*/
cdctl = I915_READ(CDCLK_CTL);
expected = (cdctl & CDCLK_FREQ_SEL_MASK) |
skl_cdclk_decimal(dev_priv->cdclk.hw.cdclk);
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
DRM_DEBUG_KMS("Sanitizing cdclk programmed by pre-os\n");
/* force cdclk programming */
dev_priv->cdclk.hw.cdclk = 0;
/* force full PLL disable + enable */
dev_priv->cdclk.hw.vco = -1;
}
/**
* skl_init_cdclk - Initialize CDCLK on SKL
* @dev_priv: i915 device
*
* Initialize CDCLK for SKL and derivatives. This is generally
* done only during the display core initialization sequence,
* after which the DMC will take care of turning CDCLK off/on
* as needed.
*/
void skl_init_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state;
skl_sanitize_cdclk(dev_priv);
if (dev_priv->cdclk.hw.cdclk != 0 &&
dev_priv->cdclk.hw.vco != 0) {
/*
* Use the current vco as our initial
* guess as to what the preferred vco is.
*/
if (dev_priv->skl_preferred_vco_freq == 0)
skl_set_preferred_cdclk_vco(dev_priv,
dev_priv->cdclk.hw.vco);
return;
}
cdclk_state = dev_priv->cdclk.hw;
cdclk_state.vco = dev_priv->skl_preferred_vco_freq;
if (cdclk_state.vco == 0)
cdclk_state.vco = 8100000;
cdclk_state.cdclk = skl_calc_cdclk(0, cdclk_state.vco);
cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
skl_set_cdclk(dev_priv, &cdclk_state);
}
/**
* skl_uninit_cdclk - Uninitialize CDCLK on SKL
* @dev_priv: i915 device
*
* Uninitialize CDCLK for SKL and derivatives. This is done only
* during the display core uninitialization sequence.
*/
void skl_uninit_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
cdclk_state.cdclk = cdclk_state.bypass;
cdclk_state.vco = 0;
cdclk_state.voltage_level = skl_calc_voltage_level(cdclk_state.cdclk);
skl_set_cdclk(dev_priv, &cdclk_state);
}
static int bxt_calc_cdclk(int min_cdclk)
{
if (min_cdclk > 576000)
return 624000;
else if (min_cdclk > 384000)
return 576000;
else if (min_cdclk > 288000)
return 384000;
else if (min_cdclk > 144000)
return 288000;
else
return 144000;
}
static int glk_calc_cdclk(int min_cdclk)
{
if (min_cdclk > 158400)
return 316800;
else if (min_cdclk > 79200)
return 158400;
else
return 79200;
}
static u8 bxt_calc_voltage_level(int cdclk)
{
return DIV_ROUND_UP(cdclk, 25000);
}
static int bxt_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
/* fall through */
case 144000:
case 288000:
case 384000:
case 576000:
ratio = 60;
break;
case 624000:
ratio = 65;
break;
}
return dev_priv->cdclk.hw.ref * ratio;
}
static int glk_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
/* fall through */
case 79200:
case 158400:
case 316800:
ratio = 33;
break;
}
return dev_priv->cdclk.hw.ref * ratio;
}
static void bxt_de_pll_update(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 val;
cdclk_state->ref = 19200;
cdclk_state->vco = 0;
val = I915_READ(BXT_DE_PLL_ENABLE);
if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
return;
if (WARN_ON((val & BXT_DE_PLL_LOCK) == 0))
return;
val = I915_READ(BXT_DE_PLL_CTL);
cdclk_state->vco = (val & BXT_DE_PLL_RATIO_MASK) * cdclk_state->ref;
}
static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 divider;
int div;
bxt_de_pll_update(dev_priv, cdclk_state);
cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
if (cdclk_state->vco == 0)
goto out;
divider = I915_READ(CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;
switch (divider) {
case BXT_CDCLK_CD2X_DIV_SEL_1:
div = 2;
break;
case BXT_CDCLK_CD2X_DIV_SEL_1_5:
WARN(IS_GEMINILAKE(dev_priv), "Unsupported divider\n");
div = 3;
break;
case BXT_CDCLK_CD2X_DIV_SEL_2:
div = 4;
break;
case BXT_CDCLK_CD2X_DIV_SEL_4:
div = 8;
break;
default:
MISSING_CASE(divider);
return;
}
cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco, div);
out:
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_state->voltage_level =
bxt_calc_voltage_level(cdclk_state->cdclk);
}
static void bxt_de_pll_disable(struct drm_i915_private *dev_priv)
{
I915_WRITE(BXT_DE_PLL_ENABLE, 0);
/* Timeout 200us */
if (intel_wait_for_register(dev_priv,
BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 0,
1))
DRM_ERROR("timeout waiting for DE PLL unlock\n");
dev_priv->cdclk.hw.vco = 0;
}
static void bxt_de_pll_enable(struct drm_i915_private *dev_priv, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, dev_priv->cdclk.hw.ref);
u32 val;
val = I915_READ(BXT_DE_PLL_CTL);
val &= ~BXT_DE_PLL_RATIO_MASK;
val |= BXT_DE_PLL_RATIO(ratio);
I915_WRITE(BXT_DE_PLL_CTL, val);
I915_WRITE(BXT_DE_PLL_ENABLE, BXT_DE_PLL_PLL_ENABLE);
/* Timeout 200us */
if (intel_wait_for_register(dev_priv,
BXT_DE_PLL_ENABLE,
BXT_DE_PLL_LOCK,
BXT_DE_PLL_LOCK,
1))
DRM_ERROR("timeout waiting for DE PLL lock\n");
dev_priv->cdclk.hw.vco = vco;
}
static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
u32 val, divider;
int ret;
/* cdclk = vco / 2 / div{1,1.5,2,4} */
switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
default:
WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
WARN_ON(vco != 0);
/* fall through */
case 2:
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
case 3:
WARN(IS_GEMINILAKE(dev_priv), "Unsupported divider\n");
divider = BXT_CDCLK_CD2X_DIV_SEL_1_5;
break;
case 4:
divider = BXT_CDCLK_CD2X_DIV_SEL_2;
break;
case 8:
divider = BXT_CDCLK_CD2X_DIV_SEL_4;
break;
}
/*
* Inform power controller of upcoming frequency change. BSpec
* requires us to wait up to 150usec, but that leads to timeouts;
* the 2ms used here is based on experiment.
*/
mutex_lock(&dev_priv->pcu_lock);
ret = sandybridge_pcode_write_timeout(dev_priv,
HSW_PCODE_DE_WRITE_FREQ_REQ,
0x80000000, 150, 2);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("PCode CDCLK freq change notify failed (err %d, freq %d)\n",
ret, cdclk);
return;
}
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
bxt_de_pll_disable(dev_priv);
if (dev_priv->cdclk.hw.vco != vco)
bxt_de_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
/*
* FIXME if only the cd2x divider needs changing, it could be done
* without shutting off the pipe (if only one pipe is active).
*/
val |= BXT_CDCLK_CD2X_PIPE_NONE;
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
if (cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
I915_WRITE(CDCLK_CTL, val);
mutex_lock(&dev_priv->pcu_lock);
/*
* The timeout isn't specified, the 2ms used here is based on
* experiment.
* FIXME: Waiting for the request completion could be delayed until
* the next PCODE request based on BSpec.
*/
ret = sandybridge_pcode_write_timeout(dev_priv,
HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_state->voltage_level, 150, 2);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("PCode CDCLK freq set failed, (err %d, freq %d)\n",
ret, cdclk);
return;
}
intel_update_cdclk(dev_priv);
}
static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
u32 cdctl, expected;
intel_update_cdclk(dev_priv);
intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
goto sanitize;
/* DPLL okay; verify the cdclock
*
* Some BIOS versions leave an incorrect decimal frequency value and
* set reserved MBZ bits in CDCLK_CTL at least during exiting from S4,
* so sanitize this register.
*/
cdctl = I915_READ(CDCLK_CTL);
/*
* Let's ignore the pipe field, since BIOS could have configured the
* dividers both synching to an active pipe, or asynchronously
* (PIPE_NONE).
*/
cdctl &= ~BXT_CDCLK_CD2X_PIPE_NONE;
expected = (cdctl & BXT_CDCLK_CD2X_DIV_SEL_MASK) |
skl_cdclk_decimal(dev_priv->cdclk.hw.cdclk);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
if (dev_priv->cdclk.hw.cdclk >= 500000)
expected |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
DRM_DEBUG_KMS("Sanitizing cdclk programmed by pre-os\n");
/* force cdclk programming */
dev_priv->cdclk.hw.cdclk = 0;
/* force full PLL disable + enable */
dev_priv->cdclk.hw.vco = -1;
}
/**
* bxt_init_cdclk - Initialize CDCLK on BXT
* @dev_priv: i915 device
*
* Initialize CDCLK for BXT and derivatives. This is generally
* done only during the display core initialization sequence,
* after which the DMC will take care of turning CDCLK off/on
* as needed.
*/
void bxt_init_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state;
bxt_sanitize_cdclk(dev_priv);
if (dev_priv->cdclk.hw.cdclk != 0 &&
dev_priv->cdclk.hw.vco != 0)
return;
cdclk_state = dev_priv->cdclk.hw;
/*
* FIXME:
* - The initial CDCLK needs to be read from VBT.
* Need to make this change after VBT has changes for BXT.
*/
if (IS_GEMINILAKE(dev_priv)) {
cdclk_state.cdclk = glk_calc_cdclk(0);
cdclk_state.vco = glk_de_pll_vco(dev_priv, cdclk_state.cdclk);
} else {
cdclk_state.cdclk = bxt_calc_cdclk(0);
cdclk_state.vco = bxt_de_pll_vco(dev_priv, cdclk_state.cdclk);
}
cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
bxt_set_cdclk(dev_priv, &cdclk_state);
}
/**
* bxt_uninit_cdclk - Uninitialize CDCLK on BXT
* @dev_priv: i915 device
*
* Uninitialize CDCLK for BXT and derivatives. This is done only
* during the display core uninitialization sequence.
*/
void bxt_uninit_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
cdclk_state.cdclk = cdclk_state.bypass;
cdclk_state.vco = 0;
cdclk_state.voltage_level = bxt_calc_voltage_level(cdclk_state.cdclk);
bxt_set_cdclk(dev_priv, &cdclk_state);
}
static int cnl_calc_cdclk(int min_cdclk)
{
if (min_cdclk > 336000)
return 528000;
else if (min_cdclk > 168000)
return 336000;
else
return 168000;
}
static u8 cnl_calc_voltage_level(int cdclk)
{
switch (cdclk) {
default:
case 168000:
return 0;
case 336000:
return 1;
case 528000:
return 2;
}
}
static void cnl_cdclk_pll_update(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 val;
if (I915_READ(SKL_DSSM) & CNL_DSSM_CDCLK_PLL_REFCLK_24MHz)
cdclk_state->ref = 24000;
else
cdclk_state->ref = 19200;
cdclk_state->vco = 0;
val = I915_READ(BXT_DE_PLL_ENABLE);
if ((val & BXT_DE_PLL_PLL_ENABLE) == 0)
return;
if (WARN_ON((val & BXT_DE_PLL_LOCK) == 0))
return;
cdclk_state->vco = (val & CNL_CDCLK_PLL_RATIO_MASK) * cdclk_state->ref;
}
static void cnl_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 divider;
int div;
cnl_cdclk_pll_update(dev_priv, cdclk_state);
cdclk_state->cdclk = cdclk_state->bypass = cdclk_state->ref;
if (cdclk_state->vco == 0)
goto out;
divider = I915_READ(CDCLK_CTL) & BXT_CDCLK_CD2X_DIV_SEL_MASK;
switch (divider) {
case BXT_CDCLK_CD2X_DIV_SEL_1:
div = 2;
break;
case BXT_CDCLK_CD2X_DIV_SEL_2:
div = 4;
break;
default:
MISSING_CASE(divider);
return;
}
cdclk_state->cdclk = DIV_ROUND_CLOSEST(cdclk_state->vco, div);
out:
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_state->voltage_level =
cnl_calc_voltage_level(cdclk_state->cdclk);
}
static void cnl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
{
u32 val;
val = I915_READ(BXT_DE_PLL_ENABLE);
val &= ~BXT_DE_PLL_PLL_ENABLE;
I915_WRITE(BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (wait_for((I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_LOCK) == 0, 1))
DRM_ERROR("timeout waiting for CDCLK PLL unlock\n");
dev_priv->cdclk.hw.vco = 0;
}
static void cnl_cdclk_pll_enable(struct drm_i915_private *dev_priv, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, dev_priv->cdclk.hw.ref);
u32 val;
val = CNL_CDCLK_PLL_RATIO(ratio);
I915_WRITE(BXT_DE_PLL_ENABLE, val);
val |= BXT_DE_PLL_PLL_ENABLE;
I915_WRITE(BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (wait_for((I915_READ(BXT_DE_PLL_ENABLE) & BXT_DE_PLL_LOCK) != 0, 1))
DRM_ERROR("timeout waiting for CDCLK PLL lock\n");
dev_priv->cdclk.hw.vco = vco;
}
static void cnl_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
int cdclk = cdclk_state->cdclk;
int vco = cdclk_state->vco;
u32 val, divider;
int ret;
mutex_lock(&dev_priv->pcu_lock);
ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
SKL_CDCLK_PREPARE_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE, 3);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
ret);
return;
}
/* cdclk = vco / 2 / div{1,2} */
switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
default:
WARN_ON(cdclk != dev_priv->cdclk.hw.bypass);
WARN_ON(vco != 0);
/* fall through */
case 2:
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
case 4:
divider = BXT_CDCLK_CD2X_DIV_SEL_2;
break;
}
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
cnl_cdclk_pll_disable(dev_priv);
if (dev_priv->cdclk.hw.vco != vco)
cnl_cdclk_pll_enable(dev_priv, vco);
val = divider | skl_cdclk_decimal(cdclk);
/*
* FIXME if only the cd2x divider needs changing, it could be done
* without shutting off the pipe (if only one pipe is active).
*/
val |= BXT_CDCLK_CD2X_PIPE_NONE;
I915_WRITE(CDCLK_CTL, val);
/* inform PCU of the change */
mutex_lock(&dev_priv->pcu_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
cdclk_state->voltage_level);
mutex_unlock(&dev_priv->pcu_lock);
intel_update_cdclk(dev_priv);
/*
* Can't read out the voltage level :(
* Let's just assume everything is as expected.
*/
dev_priv->cdclk.hw.voltage_level = cdclk_state->voltage_level;
}
static int cnl_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
/* fall through */
case 168000:
case 336000:
ratio = dev_priv->cdclk.hw.ref == 19200 ? 35 : 28;
break;
case 528000:
ratio = dev_priv->cdclk.hw.ref == 19200 ? 55 : 44;
break;
}
return dev_priv->cdclk.hw.ref * ratio;
}
static void cnl_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
u32 cdctl, expected;
intel_update_cdclk(dev_priv);
intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
goto sanitize;
/* DPLL okay; verify the cdclock
*
* Some BIOS versions leave an incorrect decimal frequency value and
* set reserved MBZ bits in CDCLK_CTL at least during exiting from S4,
* so sanitize this register.
*/
cdctl = I915_READ(CDCLK_CTL);
/*
* Let's ignore the pipe field, since BIOS could have configured the
* dividers both synching to an active pipe, or asynchronously
* (PIPE_NONE).
*/
cdctl &= ~BXT_CDCLK_CD2X_PIPE_NONE;
expected = (cdctl & BXT_CDCLK_CD2X_DIV_SEL_MASK) |
skl_cdclk_decimal(dev_priv->cdclk.hw.cdclk);
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
DRM_DEBUG_KMS("Sanitizing cdclk programmed by pre-os\n");
/* force cdclk programming */
dev_priv->cdclk.hw.cdclk = 0;
/* force full PLL disable + enable */
dev_priv->cdclk.hw.vco = -1;
}
static int icl_calc_cdclk(int min_cdclk, unsigned int ref)
{
int ranges_24[] = { 312000, 552000, 648000 };
int ranges_19_38[] = { 307200, 556800, 652800 };
int *ranges;
switch (ref) {
default:
MISSING_CASE(ref);
case 24000:
ranges = ranges_24;
break;
case 19200:
case 38400:
ranges = ranges_19_38;
break;
}
if (min_cdclk > ranges[1])
return ranges[2];
else if (min_cdclk > ranges[0])
return ranges[1];
else
return ranges[0];
}
static int icl_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
case 307200:
case 556800:
case 652800:
WARN_ON(dev_priv->cdclk.hw.ref != 19200 &&
dev_priv->cdclk.hw.ref != 38400);
break;
case 312000:
case 552000:
case 648000:
WARN_ON(dev_priv->cdclk.hw.ref != 24000);
}
ratio = cdclk / (dev_priv->cdclk.hw.ref / 2);
return dev_priv->cdclk.hw.ref * ratio;
}
static void icl_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
unsigned int cdclk = cdclk_state->cdclk;
unsigned int vco = cdclk_state->vco;
int ret;
mutex_lock(&dev_priv->pcu_lock);
ret = skl_pcode_request(dev_priv, SKL_PCODE_CDCLK_CONTROL,
SKL_CDCLK_PREPARE_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE, 3);
mutex_unlock(&dev_priv->pcu_lock);
if (ret) {
DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
ret);
return;
}
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
cnl_cdclk_pll_disable(dev_priv);
if (dev_priv->cdclk.hw.vco != vco)
cnl_cdclk_pll_enable(dev_priv, vco);
I915_WRITE(CDCLK_CTL, ICL_CDCLK_CD2X_PIPE_NONE |
skl_cdclk_decimal(cdclk));
mutex_lock(&dev_priv->pcu_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
cdclk_state->voltage_level);
mutex_unlock(&dev_priv->pcu_lock);
intel_update_cdclk(dev_priv);
/*
* Can't read out the voltage level :(
* Let's just assume everything is as expected.
*/
dev_priv->cdclk.hw.voltage_level = cdclk_state->voltage_level;
}
static u8 icl_calc_voltage_level(int cdclk)
{
switch (cdclk) {
case 50000:
case 307200:
case 312000:
return 0;
case 556800:
case 552000:
return 1;
default:
MISSING_CASE(cdclk);
case 652800:
case 648000:
return 2;
}
}
static void icl_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
u32 val;
cdclk_state->bypass = 50000;
val = I915_READ(SKL_DSSM);
switch (val & ICL_DSSM_CDCLK_PLL_REFCLK_MASK) {
default:
MISSING_CASE(val);
case ICL_DSSM_CDCLK_PLL_REFCLK_24MHz:
cdclk_state->ref = 24000;
break;
case ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz:
cdclk_state->ref = 19200;
break;
case ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz:
cdclk_state->ref = 38400;
break;
}
val = I915_READ(BXT_DE_PLL_ENABLE);
if ((val & BXT_DE_PLL_PLL_ENABLE) == 0 ||
(val & BXT_DE_PLL_LOCK) == 0) {
/*
* CDCLK PLL is disabled, the VCO/ratio doesn't matter, but
* setting it to zero is a way to signal that.
*/
cdclk_state->vco = 0;
cdclk_state->cdclk = cdclk_state->bypass;
goto out;
}
cdclk_state->vco = (val & BXT_DE_PLL_RATIO_MASK) * cdclk_state->ref;
val = I915_READ(CDCLK_CTL);
WARN_ON((val & BXT_CDCLK_CD2X_DIV_SEL_MASK) != 0);
cdclk_state->cdclk = cdclk_state->vco / 2;
out:
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_state->voltage_level =
icl_calc_voltage_level(cdclk_state->cdclk);
}
/**
* icl_init_cdclk - Initialize CDCLK on ICL
* @dev_priv: i915 device
*
* Initialize CDCLK for ICL. This consists mainly of initializing
* dev_priv->cdclk.hw and sanitizing the state of the hardware if needed. This
* is generally done only during the display core initialization sequence, after
* which the DMC will take care of turning CDCLK off/on as needed.
*/
void icl_init_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state sanitized_state;
u32 val;
/* This sets dev_priv->cdclk.hw. */
intel_update_cdclk(dev_priv);
intel_dump_cdclk_state(&dev_priv->cdclk.hw, "Current CDCLK");
/* This means CDCLK disabled. */
if (dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.bypass)
goto sanitize;
val = I915_READ(CDCLK_CTL);
if ((val & BXT_CDCLK_CD2X_DIV_SEL_MASK) != 0)
goto sanitize;
if ((val & CDCLK_FREQ_DECIMAL_MASK) !=
skl_cdclk_decimal(dev_priv->cdclk.hw.cdclk))
goto sanitize;
return;
sanitize:
DRM_DEBUG_KMS("Sanitizing cdclk programmed by pre-os\n");
sanitized_state.ref = dev_priv->cdclk.hw.ref;
sanitized_state.cdclk = icl_calc_cdclk(0, sanitized_state.ref);
sanitized_state.vco = icl_calc_cdclk_pll_vco(dev_priv,
sanitized_state.cdclk);
sanitized_state.voltage_level =
icl_calc_voltage_level(sanitized_state.cdclk);
icl_set_cdclk(dev_priv, &sanitized_state);
}
/**
* icl_uninit_cdclk - Uninitialize CDCLK on ICL
* @dev_priv: i915 device
*
* Uninitialize CDCLK for ICL. This is done only during the display core
* uninitialization sequence.
*/
void icl_uninit_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
cdclk_state.cdclk = cdclk_state.bypass;
cdclk_state.vco = 0;
cdclk_state.voltage_level = icl_calc_voltage_level(cdclk_state.cdclk);
icl_set_cdclk(dev_priv, &cdclk_state);
}
/**
* cnl_init_cdclk - Initialize CDCLK on CNL
* @dev_priv: i915 device
*
* Initialize CDCLK for CNL. This is generally
* done only during the display core initialization sequence,
* after which the DMC will take care of turning CDCLK off/on
* as needed.
*/
void cnl_init_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state;
cnl_sanitize_cdclk(dev_priv);
if (dev_priv->cdclk.hw.cdclk != 0 &&
dev_priv->cdclk.hw.vco != 0)
return;
cdclk_state = dev_priv->cdclk.hw;
cdclk_state.cdclk = cnl_calc_cdclk(0);
cdclk_state.vco = cnl_cdclk_pll_vco(dev_priv, cdclk_state.cdclk);
cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
cnl_set_cdclk(dev_priv, &cdclk_state);
}
/**
* cnl_uninit_cdclk - Uninitialize CDCLK on CNL
* @dev_priv: i915 device
*
* Uninitialize CDCLK for CNL. This is done only
* during the display core uninitialization sequence.
*/
void cnl_uninit_cdclk(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state cdclk_state = dev_priv->cdclk.hw;
cdclk_state.cdclk = cdclk_state.bypass;
cdclk_state.vco = 0;
cdclk_state.voltage_level = cnl_calc_voltage_level(cdclk_state.cdclk);
cnl_set_cdclk(dev_priv, &cdclk_state);
}
/**
* intel_cdclk_needs_modeset - Determine if two CDCLK states require a modeset on all pipes
* @a: first CDCLK state
* @b: second CDCLK state
*
* Returns:
* True if the CDCLK states require pipes to be off during reprogramming, false if not.
*/
bool intel_cdclk_needs_modeset(const struct intel_cdclk_state *a,
const struct intel_cdclk_state *b)
{
return a->cdclk != b->cdclk ||
a->vco != b->vco ||
a->ref != b->ref;
}
/**
* intel_cdclk_changed - Determine if two CDCLK states are different
* @a: first CDCLK state
* @b: second CDCLK state
*
* Returns:
* True if the CDCLK states don't match, false if they do.
*/
bool intel_cdclk_changed(const struct intel_cdclk_state *a,
const struct intel_cdclk_state *b)
{
return intel_cdclk_needs_modeset(a, b) ||
a->voltage_level != b->voltage_level;
}
void intel_dump_cdclk_state(const struct intel_cdclk_state *cdclk_state,
const char *context)
{
DRM_DEBUG_DRIVER("%s %d kHz, VCO %d kHz, ref %d kHz, bypass %d kHz, voltage level %d\n",
context, cdclk_state->cdclk, cdclk_state->vco,
cdclk_state->ref, cdclk_state->bypass,
cdclk_state->voltage_level);
}
/**
* intel_set_cdclk - Push the CDCLK state to the hardware
* @dev_priv: i915 device
* @cdclk_state: new CDCLK state
*
* Program the hardware based on the passed in CDCLK state,
* if necessary.
*/
void intel_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_state *cdclk_state)
{
if (!intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state))
return;
if (WARN_ON_ONCE(!dev_priv->display.set_cdclk))
return;
intel_dump_cdclk_state(cdclk_state, "Changing CDCLK to");
dev_priv->display.set_cdclk(dev_priv, cdclk_state);
if (WARN(intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_state),
"cdclk state doesn't match!\n")) {
intel_dump_cdclk_state(&dev_priv->cdclk.hw, "[hw state]");
intel_dump_cdclk_state(cdclk_state, "[sw state]");
}
}
static int intel_pixel_rate_to_cdclk(struct drm_i915_private *dev_priv,
int pixel_rate)
{
if (INTEL_GEN(dev_priv) >= 10)
return DIV_ROUND_UP(pixel_rate, 2);
else if (IS_GEMINILAKE(dev_priv))
/*
* FIXME: Avoid using a pixel clock that is more than 99% of the cdclk
* as a temporary workaround. Use a higher cdclk instead. (Note that
* intel_compute_max_dotclk() limits the max pixel clock to 99% of max
* cdclk.)
*/
return DIV_ROUND_UP(pixel_rate * 100, 2 * 99);
else if (IS_GEN9(dev_priv) ||
IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
return pixel_rate;
else if (IS_CHERRYVIEW(dev_priv))
return DIV_ROUND_UP(pixel_rate * 100, 95);
else
return DIV_ROUND_UP(pixel_rate * 100, 90);
}
int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *dev_priv =
to_i915(crtc_state->base.crtc->dev);
int min_cdclk;
if (!crtc_state->base.enable)
return 0;
min_cdclk = intel_pixel_rate_to_cdclk(dev_priv, crtc_state->pixel_rate);
/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
if (IS_BROADWELL(dev_priv) && hsw_crtc_state_ips_capable(crtc_state))
min_cdclk = DIV_ROUND_UP(min_cdclk * 100, 95);
/* BSpec says "Do not use DisplayPort with CDCLK less than 432 MHz,
* audio enabled, port width x4, and link rate HBR2 (5.4 GHz), or else
* there may be audio corruption or screen corruption." This cdclk
* restriction for GLK is 316.8 MHz.
*/
if (intel_crtc_has_dp_encoder(crtc_state) &&
crtc_state->has_audio &&
crtc_state->port_clock >= 540000 &&
crtc_state->lane_count == 4) {
if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv)) {
/* Display WA #1145: glk,cnl */
min_cdclk = max(316800, min_cdclk);
} else if (IS_GEN9(dev_priv) || IS_BROADWELL(dev_priv)) {
/* Display WA #1144: skl,bxt */
min_cdclk = max(432000, min_cdclk);
}
}
/*
* According to BSpec, "The CD clock frequency must be at least twice
* the frequency of the Azalia BCLK." and BCLK is 96 MHz by default.
*
* FIXME: Check the actual, not default, BCLK being used.
*
* FIXME: This does not depend on ->has_audio because the higher CDCLK
* is required for audio probe, also when there are no audio capable
* displays connected at probe time. This leads to unnecessarily high
* CDCLK when audio is not required.
*
* FIXME: This limit is only applied when there are displays connected
* at probe time. If we probe without displays, we'll still end up using
* the platform minimum CDCLK, failing audio probe.
*/
if (INTEL_GEN(dev_priv) >= 9)
min_cdclk = max(2 * 96000, min_cdclk);
/*
* On Valleyview some DSI panels lose (v|h)sync when the clock is lower
* than 320000KHz.
*/
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI) &&
IS_VALLEYVIEW(dev_priv))
min_cdclk = max(320000, min_cdclk);
if (min_cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("required cdclk (%d kHz) exceeds max (%d kHz)\n",
min_cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
return min_cdclk;
}
static int intel_compute_min_cdclk(struct drm_atomic_state *state)
{
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
int min_cdclk, i;
enum pipe pipe;
memcpy(intel_state->min_cdclk, dev_priv->min_cdclk,
sizeof(intel_state->min_cdclk));
for_each_new_intel_crtc_in_state(intel_state, crtc, crtc_state, i) {
min_cdclk = intel_crtc_compute_min_cdclk(crtc_state);
if (min_cdclk < 0)
return min_cdclk;
intel_state->min_cdclk[i] = min_cdclk;
}
min_cdclk = 0;
for_each_pipe(dev_priv, pipe)
min_cdclk = max(intel_state->min_cdclk[pipe], min_cdclk);
return min_cdclk;
}
/*
* Note that this functions assumes that 0 is
* the lowest voltage value, and higher values
* correspond to increasingly higher voltages.
*
* Should that relationship no longer hold on
* future platforms this code will need to be
* adjusted.
*/
static u8 cnl_compute_min_voltage_level(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
u8 min_voltage_level;
int i;
enum pipe pipe;
memcpy(state->min_voltage_level, dev_priv->min_voltage_level,
sizeof(state->min_voltage_level));
for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
if (crtc_state->base.enable)
state->min_voltage_level[i] =
crtc_state->min_voltage_level;
else
state->min_voltage_level[i] = 0;
}
min_voltage_level = 0;
for_each_pipe(dev_priv, pipe)
min_voltage_level = max(state->min_voltage_level[pipe],
min_voltage_level);
return min_voltage_level;
}
static int vlv_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
cdclk = vlv_calc_cdclk(dev_priv, min_cdclk);
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
vlv_calc_voltage_level(dev_priv, cdclk);
if (!intel_state->active_crtcs) {
cdclk = vlv_calc_cdclk(dev_priv, 0);
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
vlv_calc_voltage_level(dev_priv, cdclk);
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int bdw_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
/*
* FIXME should also account for plane ratio
* once 64bpp pixel formats are supported.
*/
cdclk = bdw_calc_cdclk(min_cdclk);
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
bdw_calc_voltage_level(cdclk);
if (!intel_state->active_crtcs) {
cdclk = bdw_calc_cdclk(0);
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
bdw_calc_voltage_level(cdclk);
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int skl_dpll0_vco(struct intel_atomic_state *intel_state)
{
struct drm_i915_private *dev_priv = to_i915(intel_state->base.dev);
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
int vco, i;
vco = intel_state->cdclk.logical.vco;
if (!vco)
vco = dev_priv->skl_preferred_vco_freq;
for_each_new_intel_crtc_in_state(intel_state, crtc, crtc_state, i) {
if (!crtc_state->base.enable)
continue;
if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
continue;
/*
* DPLL0 VCO may need to be adjusted to get the correct
* clock for eDP. This will affect cdclk as well.
*/
switch (crtc_state->port_clock / 2) {
case 108000:
case 216000:
vco = 8640000;
break;
default:
vco = 8100000;
break;
}
}
return vco;
}
static int skl_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
vco = skl_dpll0_vco(intel_state);
/*
* FIXME should also account for plane ratio
* once 64bpp pixel formats are supported.
*/
cdclk = skl_calc_cdclk(min_cdclk, vco);
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
skl_calc_voltage_level(cdclk);
if (!intel_state->active_crtcs) {
cdclk = skl_calc_cdclk(0, vco);
intel_state->cdclk.actual.vco = vco;
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
skl_calc_voltage_level(cdclk);
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int bxt_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
if (IS_GEMINILAKE(dev_priv)) {
cdclk = glk_calc_cdclk(min_cdclk);
vco = glk_de_pll_vco(dev_priv, cdclk);
} else {
cdclk = bxt_calc_cdclk(min_cdclk);
vco = bxt_de_pll_vco(dev_priv, cdclk);
}
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
bxt_calc_voltage_level(cdclk);
if (!intel_state->active_crtcs) {
if (IS_GEMINILAKE(dev_priv)) {
cdclk = glk_calc_cdclk(0);
vco = glk_de_pll_vco(dev_priv, cdclk);
} else {
cdclk = bxt_calc_cdclk(0);
vco = bxt_de_pll_vco(dev_priv, cdclk);
}
intel_state->cdclk.actual.vco = vco;
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
bxt_calc_voltage_level(cdclk);
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int cnl_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
cdclk = cnl_calc_cdclk(min_cdclk);
vco = cnl_cdclk_pll_vco(dev_priv, cdclk);
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
max(cnl_calc_voltage_level(cdclk),
cnl_compute_min_voltage_level(intel_state));
if (!intel_state->active_crtcs) {
cdclk = cnl_calc_cdclk(0);
vco = cnl_cdclk_pll_vco(dev_priv, cdclk);
intel_state->cdclk.actual.vco = vco;
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
cnl_calc_voltage_level(cdclk);
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int icl_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
unsigned int ref = intel_state->cdclk.logical.ref;
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
cdclk = icl_calc_cdclk(min_cdclk, ref);
vco = icl_calc_cdclk_pll_vco(dev_priv, cdclk);
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
intel_state->cdclk.logical.voltage_level =
max(icl_calc_voltage_level(cdclk),
cnl_compute_min_voltage_level(intel_state));
if (!intel_state->active_crtcs) {
cdclk = icl_calc_cdclk(0, ref);
vco = icl_calc_cdclk_pll_vco(dev_priv, cdclk);
intel_state->cdclk.actual.vco = vco;
intel_state->cdclk.actual.cdclk = cdclk;
intel_state->cdclk.actual.voltage_level =
icl_calc_voltage_level(cdclk);
} else {
intel_state->cdclk.actual = intel_state->cdclk.logical;
}
return 0;
}
static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
{
int max_cdclk_freq = dev_priv->max_cdclk_freq;
if (INTEL_GEN(dev_priv) >= 10)
return 2 * max_cdclk_freq;
else if (IS_GEMINILAKE(dev_priv))
/*
* FIXME: Limiting to 99% as a temporary workaround. See
* intel_min_cdclk() for details.
*/
return 2 * max_cdclk_freq * 99 / 100;
else if (IS_GEN9(dev_priv) ||
IS_BROADWELL(dev_priv) || IS_HASWELL(dev_priv))
return max_cdclk_freq;
else if (IS_CHERRYVIEW(dev_priv))
return max_cdclk_freq*95/100;
else if (INTEL_GEN(dev_priv) < 4)
return 2*max_cdclk_freq*90/100;
else
return max_cdclk_freq*90/100;
}
/**
* intel_update_max_cdclk - Determine the maximum support CDCLK frequency
* @dev_priv: i915 device
*
* Determine the maximum CDCLK frequency the platform supports, and also
* derive the maximum dot clock frequency the maximum CDCLK frequency
* allows.
*/
void intel_update_max_cdclk(struct drm_i915_private *dev_priv)
{
if (IS_ICELAKE(dev_priv)) {
if (dev_priv->cdclk.hw.ref == 24000)
dev_priv->max_cdclk_freq = 648000;
else
dev_priv->max_cdclk_freq = 652800;
} else if (IS_CANNONLAKE(dev_priv)) {
dev_priv->max_cdclk_freq = 528000;
} else if (IS_GEN9_BC(dev_priv)) {
u32 limit = I915_READ(SKL_DFSM) & SKL_DFSM_CDCLK_LIMIT_MASK;
int max_cdclk, vco;
vco = dev_priv->skl_preferred_vco_freq;
WARN_ON(vco != 8100000 && vco != 8640000);
/*
* Use the lower (vco 8640) cdclk values as a
* first guess. skl_calc_cdclk() will correct it
* if the preferred vco is 8100 instead.
*/
if (limit == SKL_DFSM_CDCLK_LIMIT_675)
max_cdclk = 617143;
else if (limit == SKL_DFSM_CDCLK_LIMIT_540)
max_cdclk = 540000;
else if (limit == SKL_DFSM_CDCLK_LIMIT_450)
max_cdclk = 432000;
else
max_cdclk = 308571;
dev_priv->max_cdclk_freq = skl_calc_cdclk(max_cdclk, vco);
} else if (IS_GEMINILAKE(dev_priv)) {
dev_priv->max_cdclk_freq = 316800;
} else if (IS_BROXTON(dev_priv)) {
dev_priv->max_cdclk_freq = 624000;
} else if (IS_BROADWELL(dev_priv)) {
/*
* FIXME with extra cooling we can allow
* 540 MHz for ULX and 675 Mhz for ULT.
* How can we know if extra cooling is
* available? PCI ID, VTB, something else?
*/
if (I915_READ(FUSE_STRAP) & HSW_CDCLK_LIMIT)
dev_priv->max_cdclk_freq = 450000;
else if (IS_BDW_ULX(dev_priv))
dev_priv->max_cdclk_freq = 450000;
else if (IS_BDW_ULT(dev_priv))
dev_priv->max_cdclk_freq = 540000;
else
dev_priv->max_cdclk_freq = 675000;
} else if (IS_CHERRYVIEW(dev_priv)) {
dev_priv->max_cdclk_freq = 320000;
} else if (IS_VALLEYVIEW(dev_priv)) {
dev_priv->max_cdclk_freq = 400000;
} else {
/* otherwise assume cdclk is fixed */
dev_priv->max_cdclk_freq = dev_priv->cdclk.hw.cdclk;
}
dev_priv->max_dotclk_freq = intel_compute_max_dotclk(dev_priv);
DRM_DEBUG_DRIVER("Max CD clock rate: %d kHz\n",
dev_priv->max_cdclk_freq);
DRM_DEBUG_DRIVER("Max dotclock rate: %d kHz\n",
dev_priv->max_dotclk_freq);
}
/**
* intel_update_cdclk - Determine the current CDCLK frequency
* @dev_priv: i915 device
*
* Determine the current CDCLK frequency.
*/
void intel_update_cdclk(struct drm_i915_private *dev_priv)
{
dev_priv->display.get_cdclk(dev_priv, &dev_priv->cdclk.hw);
/*
* 9:0 CMBUS [sic] CDCLK frequency (cdfreq):
* Programmng [sic] note: bit[9:2] should be programmed to the number
* of cdclk that generates 4MHz reference clock freq which is used to
* generate GMBus clock. This will vary with the cdclk freq.
*/
if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
I915_WRITE(GMBUSFREQ_VLV,
DIV_ROUND_UP(dev_priv->cdclk.hw.cdclk, 1000));
}
static int cnp_rawclk(struct drm_i915_private *dev_priv)
{
u32 rawclk;
int divider, fraction;
if (I915_READ(SFUSE_STRAP) & SFUSE_STRAP_RAW_FREQUENCY) {
/* 24 MHz */
divider = 24000;
fraction = 0;
} else {
/* 19.2 MHz */
divider = 19000;
fraction = 200;
}
rawclk = CNP_RAWCLK_DIV((divider / 1000) - 1);
if (fraction)
rawclk |= CNP_RAWCLK_FRAC(DIV_ROUND_CLOSEST(1000,
fraction) - 1);
I915_WRITE(PCH_RAWCLK_FREQ, rawclk);
return divider + fraction;
}
static int icp_rawclk(struct drm_i915_private *dev_priv)
{
u32 rawclk;
int divider, numerator, denominator, frequency;
if (I915_READ(SFUSE_STRAP) & SFUSE_STRAP_RAW_FREQUENCY) {
frequency = 24000;
divider = 23;
numerator = 0;
denominator = 0;
} else {
frequency = 19200;
divider = 18;
numerator = 1;
denominator = 4;
}
rawclk = CNP_RAWCLK_DIV(divider) | ICP_RAWCLK_NUM(numerator) |
ICP_RAWCLK_DEN(denominator);
I915_WRITE(PCH_RAWCLK_FREQ, rawclk);
return frequency;
}
static int pch_rawclk(struct drm_i915_private *dev_priv)
{
return (I915_READ(PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK) * 1000;
}
static int vlv_hrawclk(struct drm_i915_private *dev_priv)
{
/* RAWCLK_FREQ_VLV register updated from power well code */
return vlv_get_cck_clock_hpll(dev_priv, "hrawclk",
CCK_DISPLAY_REF_CLOCK_CONTROL);
}
static int g4x_hrawclk(struct drm_i915_private *dev_priv)
{
uint32_t clkcfg;
/* hrawclock is 1/4 the FSB frequency */
clkcfg = I915_READ(CLKCFG);
switch (clkcfg & CLKCFG_FSB_MASK) {
case CLKCFG_FSB_400:
return 100000;
case CLKCFG_FSB_533:
return 133333;
case CLKCFG_FSB_667:
return 166667;
case CLKCFG_FSB_800:
return 200000;
case CLKCFG_FSB_1067:
case CLKCFG_FSB_1067_ALT:
return 266667;
case CLKCFG_FSB_1333:
case CLKCFG_FSB_1333_ALT:
return 333333;
default:
return 133333;
}
}
/**
* intel_update_rawclk - Determine the current RAWCLK frequency
* @dev_priv: i915 device
*
* Determine the current RAWCLK frequency. RAWCLK is a fixed
* frequency clock so this needs to done only once.
*/
void intel_update_rawclk(struct drm_i915_private *dev_priv)
{
if (HAS_PCH_ICP(dev_priv))
dev_priv->rawclk_freq = icp_rawclk(dev_priv);
else if (HAS_PCH_CNP(dev_priv))
dev_priv->rawclk_freq = cnp_rawclk(dev_priv);
else if (HAS_PCH_SPLIT(dev_priv))
dev_priv->rawclk_freq = pch_rawclk(dev_priv);
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
dev_priv->rawclk_freq = vlv_hrawclk(dev_priv);
else if (IS_G4X(dev_priv) || IS_PINEVIEW(dev_priv))
dev_priv->rawclk_freq = g4x_hrawclk(dev_priv);
else
/* no rawclk on other platforms, or no need to know it */
return;
DRM_DEBUG_DRIVER("rawclk rate: %d kHz\n", dev_priv->rawclk_freq);
}
/**
* intel_init_cdclk_hooks - Initialize CDCLK related modesetting hooks
* @dev_priv: i915 device
*/
void intel_init_cdclk_hooks(struct drm_i915_private *dev_priv)
{
if (IS_CHERRYVIEW(dev_priv)) {
dev_priv->display.set_cdclk = chv_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
vlv_modeset_calc_cdclk;
} else if (IS_VALLEYVIEW(dev_priv)) {
dev_priv->display.set_cdclk = vlv_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
vlv_modeset_calc_cdclk;
} else if (IS_BROADWELL(dev_priv)) {
dev_priv->display.set_cdclk = bdw_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
bdw_modeset_calc_cdclk;
} else if (IS_GEN9_LP(dev_priv)) {
dev_priv->display.set_cdclk = bxt_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
bxt_modeset_calc_cdclk;
} else if (IS_GEN9_BC(dev_priv)) {
dev_priv->display.set_cdclk = skl_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
skl_modeset_calc_cdclk;
} else if (IS_CANNONLAKE(dev_priv)) {
dev_priv->display.set_cdclk = cnl_set_cdclk;
dev_priv->display.modeset_calc_cdclk =
cnl_modeset_calc_cdclk;
} else if (IS_ICELAKE(dev_priv)) {
dev_priv->display.set_cdclk = icl_set_cdclk;
dev_priv->display.modeset_calc_cdclk = icl_modeset_calc_cdclk;
}
if (IS_ICELAKE(dev_priv))
dev_priv->display.get_cdclk = icl_get_cdclk;
else if (IS_CANNONLAKE(dev_priv))
dev_priv->display.get_cdclk = cnl_get_cdclk;
else if (IS_GEN9_BC(dev_priv))
dev_priv->display.get_cdclk = skl_get_cdclk;
else if (IS_GEN9_LP(dev_priv))
dev_priv->display.get_cdclk = bxt_get_cdclk;
else if (IS_BROADWELL(dev_priv))
dev_priv->display.get_cdclk = bdw_get_cdclk;
else if (IS_HASWELL(dev_priv))
dev_priv->display.get_cdclk = hsw_get_cdclk;
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
dev_priv->display.get_cdclk = vlv_get_cdclk;
else if (IS_GEN6(dev_priv) || IS_IVYBRIDGE(dev_priv))
dev_priv->display.get_cdclk = fixed_400mhz_get_cdclk;
else if (IS_GEN5(dev_priv))
dev_priv->display.get_cdclk = fixed_450mhz_get_cdclk;
else if (IS_GM45(dev_priv))
dev_priv->display.get_cdclk = gm45_get_cdclk;
else if (IS_G45(dev_priv))
dev_priv->display.get_cdclk = g33_get_cdclk;
else if (IS_I965GM(dev_priv))
dev_priv->display.get_cdclk = i965gm_get_cdclk;
else if (IS_I965G(dev_priv))
dev_priv->display.get_cdclk = fixed_400mhz_get_cdclk;
else if (IS_PINEVIEW(dev_priv))
dev_priv->display.get_cdclk = pnv_get_cdclk;
else if (IS_G33(dev_priv))
dev_priv->display.get_cdclk = g33_get_cdclk;
else if (IS_I945GM(dev_priv))
dev_priv->display.get_cdclk = i945gm_get_cdclk;
else if (IS_I945G(dev_priv))
dev_priv->display.get_cdclk = fixed_400mhz_get_cdclk;
else if (IS_I915GM(dev_priv))
dev_priv->display.get_cdclk = i915gm_get_cdclk;
else if (IS_I915G(dev_priv))
dev_priv->display.get_cdclk = fixed_333mhz_get_cdclk;
else if (IS_I865G(dev_priv))
dev_priv->display.get_cdclk = fixed_266mhz_get_cdclk;
else if (IS_I85X(dev_priv))
dev_priv->display.get_cdclk = i85x_get_cdclk;
else if (IS_I845G(dev_priv))
dev_priv->display.get_cdclk = fixed_200mhz_get_cdclk;
else { /* 830 */
WARN(!IS_I830(dev_priv),
"Unknown platform. Assuming 133 MHz CDCLK\n");
dev_priv->display.get_cdclk = fixed_133mhz_get_cdclk;
}
}
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