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linux_dsm_epyc7002/drivers/gpu/drm/i915/intel_cdclk.c
Gabriel Krisman Bertazi 9c75b18527 drm/i915: reintroduce VLV/CHV PFI programming power domain workaround 
There are still cases on these platforms where an attempt is made to
configure the CDCLK while the power domain is off, like when coming back
from a suspend.  So the workaround below is still needed.

This effectively reverts commit 63ff304425 ("drm/i915: Nuke the
VLV/CHV PFI programming power domain workaround").

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101517
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170628210605.4994-1-krisman@collabora.co.uk
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
(cherry picked from commit 886015a0ad)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2017-07-03 16:12:44 +03:00

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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 max_pixclk)
{
int freq_320 = (dev_priv->hpll_freq << 1) % 320000 != 0 ?
333333 : 320000;
int limit = IS_CHERRYVIEW(dev_priv) ? 95 : 90;
/*
* 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_CHERRYVIEW(dev_priv) &&
max_pixclk > freq_320*limit/100)
return 400000;
else if (max_pixclk > 266667*limit/100)
return freq_320;
else if (max_pixclk > 0)
return 266667;
else
return 200000;
}
static void vlv_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_state)
{
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);
}
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;
/* 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);
if (cdclk >= 320000) /* jump to highest voltage for 400MHz too */
cmd = 2;
else if (cdclk == 266667)
cmd = 1;
else
cmd = 0;
mutex_lock(&dev_priv->rps.hw_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->rps.hw_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;
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);
/*
* 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.
*/
cmd = DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, cdclk) - 1;
mutex_lock(&dev_priv->rps.hw_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->rps.hw_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 max_pixclk)
{
if (max_pixclk > 540000)
return 675000;
else if (max_pixclk > 450000)
return 540000;
else if (max_pixclk > 337500)
return 450000;
else
return 337500;
}
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;
}
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, data;
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->rps.hw_lock);
ret = sandybridge_pcode_write(dev_priv,
BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
mutex_unlock(&dev_priv->rps.hw_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);
if (wait_for_us(I915_READ(LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE, 1))
DRM_ERROR("Switching to FCLK failed\n");
val = I915_READ(LCPLL_CTL);
val &= ~LCPLL_CLK_FREQ_MASK;
switch (cdclk) {
case 450000:
val |= LCPLL_CLK_FREQ_450;
data = 0;
break;
case 540000:
val |= LCPLL_CLK_FREQ_54O_BDW;
data = 1;
break;
case 337500:
val |= LCPLL_CLK_FREQ_337_5_BDW;
data = 2;
break;
case 675000:
val |= LCPLL_CLK_FREQ_675_BDW;
data = 3;
break;
default:
WARN(1, "invalid cdclk frequency\n");
return;
}
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->rps.hw_lock);
sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ, data);
mutex_unlock(&dev_priv->rps.hw_lock);
I915_WRITE(CDCLK_FREQ, DIV_ROUND_CLOSEST(cdclk, 1000) - 1);
intel_update_cdclk(dev_priv);
WARN(cdclk != dev_priv->cdclk.hw.cdclk,
"cdclk requested %d kHz but got %d kHz\n",
cdclk, dev_priv->cdclk.hw.cdclk);
}
static int skl_calc_cdclk(int max_pixclk, int vco)
{
if (vco == 8640000) {
if (max_pixclk > 540000)
return 617143;
else if (max_pixclk > 432000)
return 540000;
else if (max_pixclk > 308571)
return 432000;
else
return 308571;
} else {
if (max_pixclk > 540000)
return 675000;
else if (max_pixclk > 450000)
return 540000;
else if (max_pixclk > 337500)
return 450000;
else
return 337500;
}
}
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->ref;
if (cdclk_state->vco == 0)
return;
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;
}
}
}
/* 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)
{
int min_cdclk = skl_calc_cdclk(0, vco);
u32 val;
WARN_ON(vco != 8100000 && vco != 8640000);
/* select the minimum CDCLK before enabling DPLL 0 */
val = CDCLK_FREQ_337_308 | skl_cdclk_decimal(min_cdclk);
I915_WRITE(CDCLK_CTL, val);
POSTING_READ(CDCLK_CTL);
/*
* 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, pcu_ack;
int ret;
WARN_ON((cdclk == 24000) != (vco == 0));
mutex_lock(&dev_priv->rps.hw_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->rps.hw_lock);
if (ret) {
DRM_ERROR("Failed to inform PCU about cdclk change (%d)\n",
ret);
return;
}
/* set CDCLK_CTL */
switch (cdclk) {
case 450000:
case 432000:
freq_select = CDCLK_FREQ_450_432;
pcu_ack = 1;
break;
case 540000:
freq_select = CDCLK_FREQ_540;
pcu_ack = 2;
break;
case 308571:
case 337500:
default:
freq_select = CDCLK_FREQ_337_308;
pcu_ack = 0;
break;
case 617143:
case 675000:
freq_select = CDCLK_FREQ_675_617;
pcu_ack = 3;
break;
}
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
skl_dpll0_disable(dev_priv);
if (dev_priv->cdclk.hw.vco != vco)
skl_dpll0_enable(dev_priv, vco);
I915_WRITE(CDCLK_CTL, freq_select | skl_cdclk_decimal(cdclk));
POSTING_READ(CDCLK_CTL);
/* inform PCU of the change */
mutex_lock(&dev_priv->rps.hw_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL, pcu_ack);
mutex_unlock(&dev_priv->rps.hw_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);
/* Is PLL enabled and locked ? */
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
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);
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.ref;
cdclk_state.vco = 0;
skl_set_cdclk(dev_priv, &cdclk_state);
}
static int bxt_calc_cdclk(int max_pixclk)
{
if (max_pixclk > 576000)
return 624000;
else if (max_pixclk > 384000)
return 576000;
else if (max_pixclk > 288000)
return 384000;
else if (max_pixclk > 144000)
return 288000;
else
return 144000;
}
static int glk_calc_cdclk(int max_pixclk)
{
/*
* 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.)
*/
if (max_pixclk > DIV_ROUND_UP(2 * 158400 * 99, 100))
return 316800;
else if (max_pixclk > DIV_ROUND_UP(2 * 79200 * 99, 100))
return 158400;
else
return 79200;
}
static int bxt_de_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.ref)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
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.ref)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
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->ref;
if (cdclk_state->vco == 0)
return;
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);
}
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)) {
case 8:
divider = BXT_CDCLK_CD2X_DIV_SEL_4;
break;
case 4:
divider = BXT_CDCLK_CD2X_DIV_SEL_2;
break;
case 3:
WARN(IS_GEMINILAKE(dev_priv), "Unsupported divider\n");
divider = BXT_CDCLK_CD2X_DIV_SEL_1_5;
break;
case 2:
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
default:
WARN_ON(cdclk != dev_priv->cdclk.hw.ref);
WARN_ON(vco != 0);
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
}
/* Inform power controller of upcoming frequency change */
mutex_lock(&dev_priv->rps.hw_lock);
ret = sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
0x80000000);
mutex_unlock(&dev_priv->rps.hw_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->rps.hw_lock);
ret = sandybridge_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
DIV_ROUND_UP(cdclk, 25000));
mutex_unlock(&dev_priv->rps.hw_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);
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
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);
}
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.ref;
cdclk_state.vco = 0;
bxt_set_cdclk(dev_priv, &cdclk_state);
}
static int cnl_calc_cdclk(int max_pixclk)
{
if (max_pixclk > 336000)
return 528000;
else if (max_pixclk > 168000)
return 336000;
else
return 168000;
}
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->ref;
if (cdclk_state->vco == 0)
return;
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);
}
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("timout 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("timout 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, pcu_ack;
int ret;
mutex_lock(&dev_priv->rps.hw_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->rps.hw_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)) {
case 4:
divider = BXT_CDCLK_CD2X_DIV_SEL_2;
break;
case 2:
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
default:
WARN_ON(cdclk != dev_priv->cdclk.hw.ref);
WARN_ON(vco != 0);
divider = BXT_CDCLK_CD2X_DIV_SEL_1;
break;
}
switch (cdclk) {
case 528000:
pcu_ack = 2;
break;
case 336000:
pcu_ack = 1;
break;
case 168000:
default:
pcu_ack = 0;
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->rps.hw_lock);
sandybridge_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL, pcu_ack);
mutex_unlock(&dev_priv->rps.hw_lock);
intel_update_cdclk(dev_priv);
}
static int cnl_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
int ratio;
if (cdclk == dev_priv->cdclk.hw.ref)
return 0;
switch (cdclk) {
default:
MISSING_CASE(cdclk);
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);
if (dev_priv->cdclk.hw.vco == 0 ||
dev_priv->cdclk.hw.cdclk == dev_priv->cdclk.hw.ref)
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;
}
/**
* 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);
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.ref;
cdclk_state.vco = 0;
cnl_set_cdclk(dev_priv, &cdclk_state);
}
/**
* intel_cdclk_state_compare - Determine if two CDCLK states differ
* @a: first CDCLK state
* @b: second CDCLK state
*
* Returns:
* True if the CDCLK states are identical, false if they differ.
*/
bool intel_cdclk_state_compare(const struct intel_cdclk_state *a,
const struct intel_cdclk_state *b)
{
return memcmp(a, b, sizeof(*a)) == 0;
}
/**
* 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_state_compare(&dev_priv->cdclk.hw, cdclk_state))
return;
if (WARN_ON_ONCE(!dev_priv->display.set_cdclk))
return;
DRM_DEBUG_DRIVER("Changing CDCLK to %d kHz, VCO %d kHz, ref %d kHz\n",
cdclk_state->cdclk, cdclk_state->vco,
cdclk_state->ref);
dev_priv->display.set_cdclk(dev_priv, cdclk_state);
}
static int bdw_adjust_min_pipe_pixel_rate(struct intel_crtc_state *crtc_state,
int pixel_rate)
{
struct drm_i915_private *dev_priv =
to_i915(crtc_state->base.crtc->dev);
/* pixel rate mustn't exceed 95% of cdclk with IPS on BDW */
if (IS_BROADWELL(dev_priv) && crtc_state->ips_enabled)
pixel_rate = DIV_ROUND_UP(pixel_rate * 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 and since GLK can output two
* pixels per clock, the pixel rate becomes 2 * 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))
pixel_rate = max(316800, pixel_rate);
else if (IS_GEMINILAKE(dev_priv))
pixel_rate = max(2 * 316800, pixel_rate);
else
pixel_rate = max(432000, pixel_rate);
}
/* 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.
* The check for GLK has to be adjusted as the platform can output
* two pixels per clock.
*/
if (crtc_state->has_audio && INTEL_GEN(dev_priv) >= 9) {
if (IS_GEMINILAKE(dev_priv))
pixel_rate = max(2 * 2 * 96000, pixel_rate);
else
pixel_rate = max(2 * 96000, pixel_rate);
}
return pixel_rate;
}
/* compute the max rate for new configuration */
static int intel_max_pixel_rate(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 drm_crtc *crtc;
struct drm_crtc_state *cstate;
struct intel_crtc_state *crtc_state;
unsigned int max_pixel_rate = 0, i;
enum pipe pipe;
memcpy(intel_state->min_pixclk, dev_priv->min_pixclk,
sizeof(intel_state->min_pixclk));
for_each_new_crtc_in_state(state, crtc, cstate, i) {
int pixel_rate;
crtc_state = to_intel_crtc_state(cstate);
if (!crtc_state->base.enable) {
intel_state->min_pixclk[i] = 0;
continue;
}
pixel_rate = crtc_state->pixel_rate;
if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)
pixel_rate =
bdw_adjust_min_pipe_pixel_rate(crtc_state,
pixel_rate);
intel_state->min_pixclk[i] = pixel_rate;
}
for_each_pipe(dev_priv, pipe)
max_pixel_rate = max(intel_state->min_pixclk[pipe],
max_pixel_rate);
return max_pixel_rate;
}
static int vlv_modeset_calc_cdclk(struct drm_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->dev);
int max_pixclk = intel_max_pixel_rate(state);
struct intel_atomic_state *intel_state =
to_intel_atomic_state(state);
int cdclk;
cdclk = vlv_calc_cdclk(dev_priv, max_pixclk);
if (cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
intel_state->cdclk.logical.cdclk = cdclk;
if (!intel_state->active_crtcs) {
cdclk = vlv_calc_cdclk(dev_priv, 0);
intel_state->cdclk.actual.cdclk = cdclk;
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int bdw_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 max_pixclk = intel_max_pixel_rate(state);
int cdclk;
/*
* FIXME should also account for plane ratio
* once 64bpp pixel formats are supported.
*/
cdclk = bdw_calc_cdclk(max_pixclk);
if (cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
intel_state->cdclk.logical.cdclk = cdclk;
if (!intel_state->active_crtcs) {
cdclk = bdw_calc_cdclk(0);
intel_state->cdclk.actual.cdclk = cdclk;
} else {
intel_state->cdclk.actual =
intel_state->cdclk.logical;
}
return 0;
}
static int skl_modeset_calc_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);
const int max_pixclk = intel_max_pixel_rate(state);
int cdclk, vco;
vco = intel_state->cdclk.logical.vco;
if (!vco)
vco = dev_priv->skl_preferred_vco_freq;
/*
* FIXME should also account for plane ratio
* once 64bpp pixel formats are supported.
*/
cdclk = skl_calc_cdclk(max_pixclk, vco);
if (cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
if (!intel_state->active_crtcs) {
cdclk = skl_calc_cdclk(0, vco);
intel_state->cdclk.actual.vco = vco;
intel_state->cdclk.actual.cdclk = 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);
int max_pixclk = intel_max_pixel_rate(state);
struct intel_atomic_state *intel_state =
to_intel_atomic_state(state);
int cdclk, vco;
if (IS_GEMINILAKE(dev_priv)) {
cdclk = glk_calc_cdclk(max_pixclk);
vco = glk_de_pll_vco(dev_priv, cdclk);
} else {
cdclk = bxt_calc_cdclk(max_pixclk);
vco = bxt_de_pll_vco(dev_priv, cdclk);
}
if (cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = 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;
} 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 max_pixclk = intel_max_pixel_rate(state);
int cdclk, vco;
cdclk = cnl_calc_cdclk(max_pixclk);
vco = cnl_cdclk_pll_vco(dev_priv, cdclk);
if (cdclk > dev_priv->max_cdclk_freq) {
DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d kHz)\n",
cdclk, dev_priv->max_cdclk_freq);
return -EINVAL;
}
intel_state->cdclk.logical.vco = vco;
intel_state->cdclk.logical.cdclk = cdclk;
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;
} 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 (IS_GEMINILAKE(dev_priv))
/*
* FIXME: Limiting to 99% as a temporary workaround. See
* glk_calc_cdclk() for details.
*/
return 2 * max_cdclk_freq * 99 / 100;
else if (INTEL_INFO(dev_priv)->gen >= 9 ||
IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
return max_cdclk_freq;
else if (IS_CHERRYVIEW(dev_priv))
return max_cdclk_freq*95/100;
else if (INTEL_INFO(dev_priv)->gen < 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_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);
DRM_DEBUG_DRIVER("Current CD clock rate: %d kHz, VCO: %d kHz, ref: %d kHz\n",
dev_priv->cdclk.hw.cdclk, dev_priv->cdclk.hw.vco,
dev_priv->cdclk.hw.ref);
/*
* 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 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_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;
}
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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