mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-11 19:19:42 +00:00
Code Issues Releases Wiki Activity
linux-stable/drivers/gpu/drm/i915/display/intel_cdclk.c
Matt Roper e30e6c7b82 drm/i915: Move MCHBAR registers to their own header 
Registers that exist within the MCH BAR and are mirrored into the GPU's
MMIO space are a good candidate to separate out into their own header.

For reference, the mirror of the MCH BAR starts at the following
locations in the graphics MMIO space (the end of the MCHBAR range
differs slightly on each platform):

 * Pre-gen6:           0x10000
 * Gen6-Gen11 + RKL:  0x140000

v2:
 - Create separate patch to swtich a few register definitions to be
   relative to the MCHBAR mirror base.
 - Drop upper bound of MCHBAR mirror from commit message; there are too
   many different combinations between various platforms to list out,
   and the documentation is spotty for the older pre-gen6 platforms
   anyway.

Bspec: 134, 51771
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220215061342.2055952-2-matthew.d.roper@intel.com
2022-02-16 12:29:47 -08:00

3304 lines
92 KiB
C
Raw Blame History

/*
* 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 <linux/time.h>
#include "hsw_ips.h"
#include "intel_atomic.h"
#include "intel_atomic_plane.h"
#include "intel_audio.h"
#include "intel_bw.h"
#include "intel_cdclk.h"
#include "intel_crtc.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_mchbar_regs.h"
#include "intel_pci_config.h"
#include "intel_pcode.h"
#include "intel_psr.h"
#include "vlv_sideband.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.
*/
struct intel_cdclk_funcs {
void (*get_cdclk)(struct drm_i915_private *i915,
struct intel_cdclk_config *cdclk_config);
void (*set_cdclk)(struct drm_i915_private *i915,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe);
int (*bw_calc_min_cdclk)(struct intel_atomic_state *state);
int (*modeset_calc_cdclk)(struct intel_cdclk_state *state);
u8 (*calc_voltage_level)(int cdclk);
};
void intel_cdclk_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
dev_priv->cdclk_funcs->get_cdclk(dev_priv, cdclk_config);
}
static int intel_cdclk_bw_calc_min_cdclk(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
return dev_priv->cdclk_funcs->bw_calc_min_cdclk(state);
}
static void intel_cdclk_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
dev_priv->cdclk_funcs->set_cdclk(dev_priv, cdclk_config, pipe);
}
static int intel_cdclk_modeset_calc_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_state *cdclk_config)
{
return dev_priv->cdclk_funcs->modeset_calc_cdclk(cdclk_config);
}
static u8 intel_cdclk_calc_voltage_level(struct drm_i915_private *dev_priv,
int cdclk)
{
return dev_priv->cdclk_funcs->calc_voltage_level(cdclk);
}
static void fixed_133mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 133333;
}
static void fixed_200mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 200000;
}
static void fixed_266mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 266667;
}
static void fixed_333mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 333333;
}
static void fixed_400mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 400000;
}
static void fixed_450mhz_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 450000;
}
static void i85x_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
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_config->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_config->cdclk = 200000;
break;
case GC_CLOCK_166_250:
cdclk_config->cdclk = 250000;
break;
case GC_CLOCK_100_133:
cdclk_config->cdclk = 133333;
break;
case GC_CLOCK_133_266:
case GC_CLOCK_133_266_2:
case GC_CLOCK_166_266:
cdclk_config->cdclk = 266667;
break;
}
}
static void i915gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
cdclk_config->cdclk = 133333;
return;
}
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_333_320_MHZ:
cdclk_config->cdclk = 333333;
break;
default:
case GC_DISPLAY_CLOCK_190_200_MHZ:
cdclk_config->cdclk = 190000;
break;
}
}
static void i945gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
if (gcfgc & GC_LOW_FREQUENCY_ENABLE) {
cdclk_config->cdclk = 133333;
return;
}
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_333_320_MHZ:
cdclk_config->cdclk = 320000;
break;
default:
case GC_DISPLAY_CLOCK_190_200_MHZ:
cdclk_config->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;
u8 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 = intel_de_read(dev_priv,
IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv) ? HPLLVCO_MOBILE : HPLLVCO);
vco = vco_table[tmp & 0x7];
if (vco == 0)
drm_err(&dev_priv->drm, "Bad HPLL VCO (HPLLVCO=0x%02x)\n",
tmp);
else
drm_dbg_kms(&dev_priv->drm, "HPLL VCO %u kHz\n", vco);
return vco;
}
static void g33_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
static const u8 div_3200[] = { 12, 10, 8, 7, 5, 16 };
static const u8 div_4000[] = { 14, 12, 10, 8, 6, 20 };
static const u8 div_4800[] = { 20, 14, 12, 10, 8, 24 };
static const u8 div_5333[] = { 20, 16, 12, 12, 8, 28 };
const u8 *div_table;
unsigned int cdclk_sel;
u16 tmp = 0;
cdclk_config->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_config->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_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco,
div_table[cdclk_sel]);
return;
fail:
drm_err(&dev_priv->drm,
"Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%08x\n",
cdclk_config->vco, tmp);
cdclk_config->cdclk = 190476;
}
static void pnv_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
u16 gcfgc = 0;
pci_read_config_word(pdev, GCFGC, &gcfgc);
switch (gcfgc & GC_DISPLAY_CLOCK_MASK) {
case GC_DISPLAY_CLOCK_267_MHZ_PNV:
cdclk_config->cdclk = 266667;
break;
case GC_DISPLAY_CLOCK_333_MHZ_PNV:
cdclk_config->cdclk = 333333;
break;
case GC_DISPLAY_CLOCK_444_MHZ_PNV:
cdclk_config->cdclk = 444444;
break;
case GC_DISPLAY_CLOCK_200_MHZ_PNV:
cdclk_config->cdclk = 200000;
break;
default:
drm_err(&dev_priv->drm,
"Unknown pnv display core clock 0x%04x\n", gcfgc);
fallthrough;
case GC_DISPLAY_CLOCK_133_MHZ_PNV:
cdclk_config->cdclk = 133333;
break;
case GC_DISPLAY_CLOCK_167_MHZ_PNV:
cdclk_config->cdclk = 166667;
break;
}
}
static void i965gm_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
static const u8 div_3200[] = { 16, 10, 8 };
static const u8 div_4000[] = { 20, 12, 10 };
static const u8 div_5333[] = { 24, 16, 14 };
const u8 *div_table;
unsigned int cdclk_sel;
u16 tmp = 0;
cdclk_config->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_config->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_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco,
div_table[cdclk_sel]);
return;
fail:
drm_err(&dev_priv->drm,
"Unable to determine CDCLK. HPLL VCO=%u kHz, CFGC=0x%04x\n",
cdclk_config->vco, tmp);
cdclk_config->cdclk = 200000;
}
static void gm45_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
unsigned int cdclk_sel;
u16 tmp = 0;
cdclk_config->vco = intel_hpll_vco(dev_priv);
pci_read_config_word(pdev, GCFGC, &tmp);
cdclk_sel = (tmp >> 12) & 0x1;
switch (cdclk_config->vco) {
case 2666667:
case 4000000:
case 5333333:
cdclk_config->cdclk = cdclk_sel ? 333333 : 222222;
break;
case 3200000:
cdclk_config->cdclk = cdclk_sel ? 320000 : 228571;
break;
default:
drm_err(&dev_priv->drm,
"Unable to determine CDCLK. HPLL VCO=%u, CFGC=0x%04x\n",
cdclk_config->vco, tmp);
cdclk_config->cdclk = 222222;
break;
}
}
static void hsw_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
u32 lcpll = intel_de_read(dev_priv, LCPLL_CTL);
u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_config->cdclk = 800000;
else if (intel_de_read(dev_priv, FUSE_STRAP) & HSW_CDCLK_LIMIT)
cdclk_config->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_450)
cdclk_config->cdclk = 450000;
else if (IS_HSW_ULT(dev_priv))
cdclk_config->cdclk = 337500;
else
cdclk_config->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_config *cdclk_config)
{
u32 val;
vlv_iosf_sb_get(dev_priv,
BIT(VLV_IOSF_SB_CCK) | BIT(VLV_IOSF_SB_PUNIT));
cdclk_config->vco = vlv_get_hpll_vco(dev_priv);
cdclk_config->cdclk = vlv_get_cck_clock(dev_priv, "cdclk",
CCK_DISPLAY_CLOCK_CONTROL,
cdclk_config->vco);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM);
vlv_iosf_sb_put(dev_priv,
BIT(VLV_IOSF_SB_CCK) | BIT(VLV_IOSF_SB_PUNIT));
if (IS_VALLEYVIEW(dev_priv))
cdclk_config->voltage_level = (val & DSPFREQGUAR_MASK) >>
DSPFREQGUAR_SHIFT;
else
cdclk_config->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?
*/
intel_de_write(dev_priv, GCI_CONTROL,
VGA_FAST_MODE_DISABLE | default_credits);
intel_de_write(dev_priv, GCI_CONTROL,
VGA_FAST_MODE_DISABLE | credits | PFI_CREDIT_RESEND);
/*
* FIXME is this guaranteed to clear
* immediately or should we poll for it?
*/
drm_WARN_ON(&dev_priv->drm,
intel_de_read(dev_priv, GCI_CONTROL) & PFI_CREDIT_RESEND);
}
static void vlv_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
u32 val, cmd = cdclk_config->voltage_level;
intel_wakeref_t wakeref;
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 display core domain, which covers
* the HW blocks needed for the following programming.
*/
wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
vlv_iosf_sb_get(dev_priv,
BIT(VLV_IOSF_SB_CCK) |
BIT(VLV_IOSF_SB_BUNIT) |
BIT(VLV_IOSF_SB_PUNIT));
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM);
val &= ~DSPFREQGUAR_MASK;
val |= (cmd << DSPFREQGUAR_SHIFT);
vlv_punit_write(dev_priv, PUNIT_REG_DSPSSPM, val);
if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM) &
DSPFREQSTAT_MASK) == (cmd << DSPFREQSTAT_SHIFT),
50)) {
drm_err(&dev_priv->drm,
"timed out waiting for CDclk change\n");
}
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_err(&dev_priv->drm,
"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);
vlv_iosf_sb_put(dev_priv,
BIT(VLV_IOSF_SB_CCK) |
BIT(VLV_IOSF_SB_BUNIT) |
BIT(VLV_IOSF_SB_PUNIT));
intel_update_cdclk(dev_priv);
vlv_program_pfi_credits(dev_priv);
intel_display_power_put(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref);
}
static void chv_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
u32 val, cmd = cdclk_config->voltage_level;
intel_wakeref_t wakeref;
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 display core domain, which covers
* the HW blocks needed for the following programming.
*/
wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
vlv_punit_get(dev_priv);
val = vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM);
val &= ~DSPFREQGUAR_MASK_CHV;
val |= (cmd << DSPFREQGUAR_SHIFT_CHV);
vlv_punit_write(dev_priv, PUNIT_REG_DSPSSPM, val);
if (wait_for((vlv_punit_read(dev_priv, PUNIT_REG_DSPSSPM) &
DSPFREQSTAT_MASK_CHV) == (cmd << DSPFREQSTAT_SHIFT_CHV),
50)) {
drm_err(&dev_priv->drm,
"timed out waiting for CDclk change\n");
}
vlv_punit_put(dev_priv);
intel_update_cdclk(dev_priv);
vlv_program_pfi_credits(dev_priv);
intel_display_power_put(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref);
}
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_config *cdclk_config)
{
u32 lcpll = intel_de_read(dev_priv, LCPLL_CTL);
u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_config->cdclk = 800000;
else if (intel_de_read(dev_priv, FUSE_STRAP) & HSW_CDCLK_LIMIT)
cdclk_config->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_450)
cdclk_config->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_54O_BDW)
cdclk_config->cdclk = 540000;
else if (freq == LCPLL_CLK_FREQ_337_5_BDW)
cdclk_config->cdclk = 337500;
else
cdclk_config->cdclk = 675000;
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_config->voltage_level =
bdw_calc_voltage_level(cdclk_config->cdclk);
}
static u32 bdw_cdclk_freq_sel(int cdclk)
{
switch (cdclk) {
default:
MISSING_CASE(cdclk);
fallthrough;
case 337500:
return LCPLL_CLK_FREQ_337_5_BDW;
case 450000:
return LCPLL_CLK_FREQ_450;
case 540000:
return LCPLL_CLK_FREQ_54O_BDW;
case 675000:
return LCPLL_CLK_FREQ_675_BDW;
}
}
static void bdw_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
int ret;
if (drm_WARN(&dev_priv->drm,
(intel_de_read(dev_priv, 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;
ret = snb_pcode_write(dev_priv, BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
if (ret) {
drm_err(&dev_priv->drm,
"failed to inform pcode about cdclk change\n");
return;
}
intel_de_rmw(dev_priv, LCPLL_CTL,
0, LCPLL_CD_SOURCE_FCLK);
/*
* 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(intel_de_read(dev_priv, LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE, 100))
drm_err(&dev_priv->drm, "Switching to FCLK failed\n");
intel_de_rmw(dev_priv, LCPLL_CTL,
LCPLL_CLK_FREQ_MASK, bdw_cdclk_freq_sel(cdclk));
intel_de_rmw(dev_priv, LCPLL_CTL,
LCPLL_CD_SOURCE_FCLK, 0);
if (wait_for_us((intel_de_read(dev_priv, LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
drm_err(&dev_priv->drm, "Switching back to LCPLL failed\n");
snb_pcode_write(dev_priv, HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_config->voltage_level);
intel_de_write(dev_priv, 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)
{
if (cdclk > 540000)
return 3;
else if (cdclk > 450000)
return 2;
else if (cdclk > 337500)
return 1;
else
return 0;
}
static void skl_dpll0_update(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
u32 val;
cdclk_config->ref = 24000;
cdclk_config->vco = 0;
val = intel_de_read(dev_priv, LCPLL1_CTL);
if ((val & LCPLL_PLL_ENABLE) == 0)
return;
if (drm_WARN_ON(&dev_priv->drm, (val & LCPLL_PLL_LOCK) == 0))
return;
val = intel_de_read(dev_priv, DPLL_CTRL1);
if (drm_WARN_ON(&dev_priv->drm,
(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_config->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_config->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_config *cdclk_config)
{
u32 cdctl;
skl_dpll0_update(dev_priv, cdclk_config);
cdclk_config->cdclk = cdclk_config->bypass = cdclk_config->ref;
if (cdclk_config->vco == 0)
goto out;
cdctl = intel_de_read(dev_priv, CDCLK_CTL);
if (cdclk_config->vco == 8640000) {
switch (cdctl & CDCLK_FREQ_SEL_MASK) {
case CDCLK_FREQ_450_432:
cdclk_config->cdclk = 432000;
break;
case CDCLK_FREQ_337_308:
cdclk_config->cdclk = 308571;
break;
case CDCLK_FREQ_540:
cdclk_config->cdclk = 540000;
break;
case CDCLK_FREQ_675_617:
cdclk_config->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_config->cdclk = 450000;
break;
case CDCLK_FREQ_337_308:
cdclk_config->cdclk = 337500;
break;
case CDCLK_FREQ_540:
cdclk_config->cdclk = 540000;
break;
case CDCLK_FREQ_675_617:
cdclk_config->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_config->voltage_level =
skl_calc_voltage_level(cdclk_config->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 u32 skl_dpll0_link_rate(struct drm_i915_private *dev_priv, int vco)
{
drm_WARN_ON(&dev_priv->drm, 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.
*/
if (vco == 8640000)
return DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_1080, SKL_DPLL0);
else
return DPLL_CTRL1_LINK_RATE(DPLL_CTRL1_LINK_RATE_810, SKL_DPLL0);
}
static void skl_dpll0_enable(struct drm_i915_private *dev_priv, int vco)
{
intel_de_rmw(dev_priv, DPLL_CTRL1,
DPLL_CTRL1_HDMI_MODE(SKL_DPLL0) |
DPLL_CTRL1_SSC(SKL_DPLL0) |
DPLL_CTRL1_LINK_RATE_MASK(SKL_DPLL0),
DPLL_CTRL1_OVERRIDE(SKL_DPLL0) |
skl_dpll0_link_rate(dev_priv, vco));
intel_de_posting_read(dev_priv, DPLL_CTRL1);
intel_de_rmw(dev_priv, LCPLL1_CTL,
0, LCPLL_PLL_ENABLE);
if (intel_de_wait_for_set(dev_priv, LCPLL1_CTL, LCPLL_PLL_LOCK, 5))
drm_err(&dev_priv->drm, "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)
{
intel_de_rmw(dev_priv, LCPLL1_CTL,
LCPLL_PLL_ENABLE, 0);
if (intel_de_wait_for_clear(dev_priv, LCPLL1_CTL, LCPLL_PLL_LOCK, 1))
drm_err(&dev_priv->drm, "Couldn't disable DPLL0\n");
dev_priv->cdclk.hw.vco = 0;
}
static u32 skl_cdclk_freq_sel(struct drm_i915_private *dev_priv,
int cdclk, int vco)
{
switch (cdclk) {
default:
drm_WARN_ON(&dev_priv->drm,
cdclk != dev_priv->cdclk.hw.bypass);
drm_WARN_ON(&dev_priv->drm, vco != 0);
fallthrough;
case 308571:
case 337500:
return CDCLK_FREQ_337_308;
case 450000:
case 432000:
return CDCLK_FREQ_450_432;
case 540000:
return CDCLK_FREQ_540;
case 617143:
case 675000:
return CDCLK_FREQ_675_617;
}
}
static void skl_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
int vco = cdclk_config->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.
*/
drm_WARN_ON_ONCE(&dev_priv->drm,
IS_SKYLAKE(dev_priv) && vco == 8640000);
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);
if (ret) {
drm_err(&dev_priv->drm,
"Failed to inform PCU about cdclk change (%d)\n", ret);
return;
}
freq_select = skl_cdclk_freq_sel(dev_priv, cdclk, vco);
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
skl_dpll0_disable(dev_priv);
cdclk_ctl = intel_de_read(dev_priv, 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);
intel_de_write(dev_priv, CDCLK_CTL, cdclk_ctl);
}
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
intel_de_write(dev_priv, CDCLK_CTL, cdclk_ctl);
intel_de_posting_read(dev_priv, 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);
intel_de_write(dev_priv, CDCLK_CTL, cdclk_ctl);
cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
intel_de_write(dev_priv, CDCLK_CTL, cdclk_ctl);
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
intel_de_write(dev_priv, CDCLK_CTL, cdclk_ctl);
intel_de_posting_read(dev_priv, CDCLK_CTL);
/* inform PCU of the change */
snb_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
cdclk_config->voltage_level);
intel_update_cdclk(dev_priv);
}
static void skl_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
u32 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 ((intel_de_read(dev_priv, SWF_ILK(0x18)) & 0x00FFFFFF) == 0)
goto sanitize;
intel_update_cdclk(dev_priv);
intel_cdclk_dump_config(dev_priv, &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 = intel_de_read(dev_priv, 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_dbg_kms(&dev_priv->drm, "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 void skl_cdclk_init_hw(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_config cdclk_config;
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_config = dev_priv->cdclk.hw;
cdclk_config.vco = dev_priv->skl_preferred_vco_freq;
if (cdclk_config.vco == 0)
cdclk_config.vco = 8100000;
cdclk_config.cdclk = skl_calc_cdclk(0, cdclk_config.vco);
cdclk_config.voltage_level = skl_calc_voltage_level(cdclk_config.cdclk);
skl_set_cdclk(dev_priv, &cdclk_config, INVALID_PIPE);
}
static void skl_cdclk_uninit_hw(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_config cdclk_config = dev_priv->cdclk.hw;
cdclk_config.cdclk = cdclk_config.bypass;
cdclk_config.vco = 0;
cdclk_config.voltage_level = skl_calc_voltage_level(cdclk_config.cdclk);
skl_set_cdclk(dev_priv, &cdclk_config, INVALID_PIPE);
}
static bool has_cdclk_squasher(struct drm_i915_private *i915)
{
return IS_DG2(i915);
}
struct intel_cdclk_vals {
u32 cdclk;
u16 refclk;
u16 waveform;
u8 divider; /* CD2X divider * 2 */
u8 ratio;
};
static const struct intel_cdclk_vals bxt_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 144000, .divider = 8, .ratio = 60 },
{ .refclk = 19200, .cdclk = 288000, .divider = 4, .ratio = 60 },
{ .refclk = 19200, .cdclk = 384000, .divider = 3, .ratio = 60 },
{ .refclk = 19200, .cdclk = 576000, .divider = 2, .ratio = 60 },
{ .refclk = 19200, .cdclk = 624000, .divider = 2, .ratio = 65 },
{}
};
static const struct intel_cdclk_vals glk_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 79200, .divider = 8, .ratio = 33 },
{ .refclk = 19200, .cdclk = 158400, .divider = 4, .ratio = 33 },
{ .refclk = 19200, .cdclk = 316800, .divider = 2, .ratio = 33 },
{}
};
static const struct intel_cdclk_vals icl_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .divider = 2, .ratio = 18 },
{ .refclk = 19200, .cdclk = 192000, .divider = 2, .ratio = 20 },
{ .refclk = 19200, .cdclk = 307200, .divider = 2, .ratio = 32 },
{ .refclk = 19200, .cdclk = 326400, .divider = 4, .ratio = 68 },
{ .refclk = 19200, .cdclk = 556800, .divider = 2, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .divider = 2, .ratio = 68 },
{ .refclk = 24000, .cdclk = 180000, .divider = 2, .ratio = 15 },
{ .refclk = 24000, .cdclk = 192000, .divider = 2, .ratio = 16 },
{ .refclk = 24000, .cdclk = 312000, .divider = 2, .ratio = 26 },
{ .refclk = 24000, .cdclk = 324000, .divider = 4, .ratio = 54 },
{ .refclk = 24000, .cdclk = 552000, .divider = 2, .ratio = 46 },
{ .refclk = 24000, .cdclk = 648000, .divider = 2, .ratio = 54 },
{ .refclk = 38400, .cdclk = 172800, .divider = 2, .ratio = 9 },
{ .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 10 },
{ .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16 },
{ .refclk = 38400, .cdclk = 326400, .divider = 4, .ratio = 34 },
{ .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals rkl_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .divider = 4, .ratio = 36 },
{ .refclk = 19200, .cdclk = 192000, .divider = 4, .ratio = 40 },
{ .refclk = 19200, .cdclk = 307200, .divider = 4, .ratio = 64 },
{ .refclk = 19200, .cdclk = 326400, .divider = 8, .ratio = 136 },
{ .refclk = 19200, .cdclk = 556800, .divider = 4, .ratio = 116 },
{ .refclk = 19200, .cdclk = 652800, .divider = 4, .ratio = 136 },
{ .refclk = 24000, .cdclk = 180000, .divider = 4, .ratio = 30 },
{ .refclk = 24000, .cdclk = 192000, .divider = 4, .ratio = 32 },
{ .refclk = 24000, .cdclk = 312000, .divider = 4, .ratio = 52 },
{ .refclk = 24000, .cdclk = 324000, .divider = 8, .ratio = 108 },
{ .refclk = 24000, .cdclk = 552000, .divider = 4, .ratio = 92 },
{ .refclk = 24000, .cdclk = 648000, .divider = 4, .ratio = 108 },
{ .refclk = 38400, .cdclk = 172800, .divider = 4, .ratio = 18 },
{ .refclk = 38400, .cdclk = 192000, .divider = 4, .ratio = 20 },
{ .refclk = 38400, .cdclk = 307200, .divider = 4, .ratio = 32 },
{ .refclk = 38400, .cdclk = 326400, .divider = 8, .ratio = 68 },
{ .refclk = 38400, .cdclk = 556800, .divider = 4, .ratio = 58 },
{ .refclk = 38400, .cdclk = 652800, .divider = 4, .ratio = 68 },
{}
};
static const struct intel_cdclk_vals adlp_a_step_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 307200, .divider = 2, .ratio = 32 },
{ .refclk = 19200, .cdclk = 556800, .divider = 2, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .divider = 2, .ratio = 68 },
{ .refclk = 24000, .cdclk = 312000, .divider = 2, .ratio = 26 },
{ .refclk = 24000, .cdclk = 552000, .divider = 2, .ratio = 46 },
{ .refclk = 24400, .cdclk = 648000, .divider = 2, .ratio = 54 },
{ .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16 },
{ .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals adlp_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .divider = 3, .ratio = 27 },
{ .refclk = 19200, .cdclk = 192000, .divider = 2, .ratio = 20 },
{ .refclk = 19200, .cdclk = 307200, .divider = 2, .ratio = 32 },
{ .refclk = 19200, .cdclk = 556800, .divider = 2, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .divider = 2, .ratio = 68 },
{ .refclk = 24000, .cdclk = 176000, .divider = 3, .ratio = 22 },
{ .refclk = 24000, .cdclk = 192000, .divider = 2, .ratio = 16 },
{ .refclk = 24000, .cdclk = 312000, .divider = 2, .ratio = 26 },
{ .refclk = 24000, .cdclk = 552000, .divider = 2, .ratio = 46 },
{ .refclk = 24400, .cdclk = 648000, .divider = 2, .ratio = 54 },
{ .refclk = 38400, .cdclk = 179200, .divider = 3, .ratio = 14 },
{ .refclk = 38400, .cdclk = 192000, .divider = 2, .ratio = 10 },
{ .refclk = 38400, .cdclk = 307200, .divider = 2, .ratio = 16 },
{ .refclk = 38400, .cdclk = 556800, .divider = 2, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals dg2_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 163200, .divider = 2, .ratio = 34, .waveform = 0x8888 },
{ .refclk = 38400, .cdclk = 204000, .divider = 2, .ratio = 34, .waveform = 0x9248 },
{ .refclk = 38400, .cdclk = 244800, .divider = 2, .ratio = 34, .waveform = 0xa4a4 },
{ .refclk = 38400, .cdclk = 285600, .divider = 2, .ratio = 34, .waveform = 0xa54a },
{ .refclk = 38400, .cdclk = 326400, .divider = 2, .ratio = 34, .waveform = 0xaaaa },
{ .refclk = 38400, .cdclk = 367200, .divider = 2, .ratio = 34, .waveform = 0xad5a },
{ .refclk = 38400, .cdclk = 408000, .divider = 2, .ratio = 34, .waveform = 0xb6b6 },
{ .refclk = 38400, .cdclk = 448800, .divider = 2, .ratio = 34, .waveform = 0xdbb6 },
{ .refclk = 38400, .cdclk = 489600, .divider = 2, .ratio = 34, .waveform = 0xeeee },
{ .refclk = 38400, .cdclk = 530400, .divider = 2, .ratio = 34, .waveform = 0xf7de },
{ .refclk = 38400, .cdclk = 571200, .divider = 2, .ratio = 34, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 612000, .divider = 2, .ratio = 34, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 652800, .divider = 2, .ratio = 34, .waveform = 0xffff },
{}
};
static int bxt_calc_cdclk(struct drm_i915_private *dev_priv, int min_cdclk)
{
const struct intel_cdclk_vals *table = dev_priv->cdclk.table;
int i;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == dev_priv->cdclk.hw.ref &&
table[i].cdclk >= min_cdclk)
return table[i].cdclk;
drm_WARN(&dev_priv->drm, 1,
"Cannot satisfy minimum cdclk %d with refclk %u\n",
min_cdclk, dev_priv->cdclk.hw.ref);
return 0;
}
static int bxt_calc_cdclk_pll_vco(struct drm_i915_private *dev_priv, int cdclk)
{
const struct intel_cdclk_vals *table = dev_priv->cdclk.table;
int i;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == dev_priv->cdclk.hw.ref &&
table[i].cdclk == cdclk)
return dev_priv->cdclk.hw.ref * table[i].ratio;
drm_WARN(&dev_priv->drm, 1, "cdclk %d not valid for refclk %u\n",
cdclk, dev_priv->cdclk.hw.ref);
return 0;
}
static u8 bxt_calc_voltage_level(int cdclk)
{
return DIV_ROUND_UP(cdclk, 25000);
}
static u8 icl_calc_voltage_level(int cdclk)
{
if (cdclk > 556800)
return 2;
else if (cdclk > 312000)
return 1;
else
return 0;
}
static u8 ehl_calc_voltage_level(int cdclk)
{
if (cdclk > 326400)
return 3;
else if (cdclk > 312000)
return 2;
else if (cdclk > 180000)
return 1;
else
return 0;
}
static u8 tgl_calc_voltage_level(int cdclk)
{
if (cdclk > 556800)
return 3;
else if (cdclk > 326400)
return 2;
else if (cdclk > 312000)
return 1;
else
return 0;
}
static void icl_readout_refclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
u32 dssm = intel_de_read(dev_priv, SKL_DSSM) & ICL_DSSM_CDCLK_PLL_REFCLK_MASK;
switch (dssm) {
default:
MISSING_CASE(dssm);
fallthrough;
case ICL_DSSM_CDCLK_PLL_REFCLK_24MHz:
cdclk_config->ref = 24000;
break;
case ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz:
cdclk_config->ref = 19200;
break;
case ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz:
cdclk_config->ref = 38400;
break;
}
}
static void bxt_de_pll_readout(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
u32 val, ratio;
if (IS_DG2(dev_priv))
cdclk_config->ref = 38400;
else if (DISPLAY_VER(dev_priv) >= 11)
icl_readout_refclk(dev_priv, cdclk_config);
else
cdclk_config->ref = 19200;
val = intel_de_read(dev_priv, 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_config->vco = 0;
return;
}
/*
* DISPLAY_VER >= 11 have the ratio directly in the PLL enable register,
* gen9lp had it in a separate PLL control register.
*/
if (DISPLAY_VER(dev_priv) >= 11)
ratio = val & ICL_CDCLK_PLL_RATIO_MASK;
else
ratio = intel_de_read(dev_priv, BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;
cdclk_config->vco = ratio * cdclk_config->ref;
}
static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
struct intel_cdclk_config *cdclk_config)
{
u32 squash_ctl = 0;
u32 divider;
int div;
bxt_de_pll_readout(dev_priv, cdclk_config);
if (DISPLAY_VER(dev_priv) >= 12)
cdclk_config->bypass = cdclk_config->ref / 2;
else if (DISPLAY_VER(dev_priv) >= 11)
cdclk_config->bypass = 50000;
else
cdclk_config->bypass = cdclk_config->ref;
if (cdclk_config->vco == 0) {
cdclk_config->cdclk = cdclk_config->bypass;
goto out;
}
divider = intel_de_read(dev_priv, 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:
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;
}
if (has_cdclk_squasher(dev_priv))
squash_ctl = intel_de_read(dev_priv, CDCLK_SQUASH_CTL);
if (squash_ctl & CDCLK_SQUASH_ENABLE) {
u16 waveform;
int size;
size = REG_FIELD_GET(CDCLK_SQUASH_WINDOW_SIZE_MASK, squash_ctl) + 1;
waveform = REG_FIELD_GET(CDCLK_SQUASH_WAVEFORM_MASK, squash_ctl) >> (16 - size);
cdclk_config->cdclk = DIV_ROUND_CLOSEST(hweight16(waveform) *
cdclk_config->vco, size * div);
} else {
cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_config->vco, div);
}
out:
/*
* Can't read this out :( Let's assume it's
* at least what the CDCLK frequency requires.
*/
cdclk_config->voltage_level =
intel_cdclk_calc_voltage_level(dev_priv, cdclk_config->cdclk);
}
static void bxt_de_pll_disable(struct drm_i915_private *dev_priv)
{
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, 0);
/* Timeout 200us */
if (intel_de_wait_for_clear(dev_priv,
BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(&dev_priv->drm, "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);
intel_de_rmw(dev_priv, BXT_DE_PLL_CTL,
BXT_DE_PLL_RATIO_MASK, BXT_DE_PLL_RATIO(ratio));
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, BXT_DE_PLL_PLL_ENABLE);
/* Timeout 200us */
if (intel_de_wait_for_set(dev_priv,
BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(&dev_priv->drm, "timeout waiting for DE PLL lock\n");
dev_priv->cdclk.hw.vco = vco;
}
static void icl_cdclk_pll_disable(struct drm_i915_private *dev_priv)
{
intel_de_rmw(dev_priv, BXT_DE_PLL_ENABLE,
BXT_DE_PLL_PLL_ENABLE, 0);
/* Timeout 200us */
if (intel_de_wait_for_clear(dev_priv, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(&dev_priv->drm, "timeout waiting for CDCLK PLL unlock\n");
dev_priv->cdclk.hw.vco = 0;
}
static void icl_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 = ICL_CDCLK_PLL_RATIO(ratio);
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);
val |= BXT_DE_PLL_PLL_ENABLE;
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (intel_de_wait_for_set(dev_priv, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(&dev_priv->drm, "timeout waiting for CDCLK PLL lock\n");
dev_priv->cdclk.hw.vco = vco;
}
static void adlp_cdclk_pll_crawl(struct drm_i915_private *dev_priv, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, dev_priv->cdclk.hw.ref);
u32 val;
/* Write PLL ratio without disabling */
val = ICL_CDCLK_PLL_RATIO(ratio) | BXT_DE_PLL_PLL_ENABLE;
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);
/* Submit freq change request */
val |= BXT_DE_PLL_FREQ_REQ;
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (intel_de_wait_for_set(dev_priv, BXT_DE_PLL_ENABLE,
BXT_DE_PLL_LOCK | BXT_DE_PLL_FREQ_REQ_ACK, 1))
drm_err(&dev_priv->drm, "timeout waiting for FREQ change request ack\n");
val &= ~BXT_DE_PLL_FREQ_REQ;
intel_de_write(dev_priv, BXT_DE_PLL_ENABLE, val);
dev_priv->cdclk.hw.vco = vco;
}
static u32 bxt_cdclk_cd2x_pipe(struct drm_i915_private *dev_priv, enum pipe pipe)
{
if (DISPLAY_VER(dev_priv) >= 12) {
if (pipe == INVALID_PIPE)
return TGL_CDCLK_CD2X_PIPE_NONE;
else
return TGL_CDCLK_CD2X_PIPE(pipe);
} else if (DISPLAY_VER(dev_priv) >= 11) {
if (pipe == INVALID_PIPE)
return ICL_CDCLK_CD2X_PIPE_NONE;
else
return ICL_CDCLK_CD2X_PIPE(pipe);
} else {
if (pipe == INVALID_PIPE)
return BXT_CDCLK_CD2X_PIPE_NONE;
else
return BXT_CDCLK_CD2X_PIPE(pipe);
}
}
static u32 bxt_cdclk_cd2x_div_sel(struct drm_i915_private *dev_priv,
int cdclk, int vco)
{
/* cdclk = vco / 2 / div{1,1.5,2,4} */
switch (DIV_ROUND_CLOSEST(vco, cdclk)) {
default:
drm_WARN_ON(&dev_priv->drm,
cdclk != dev_priv->cdclk.hw.bypass);
drm_WARN_ON(&dev_priv->drm, vco != 0);
fallthrough;
case 2:
return BXT_CDCLK_CD2X_DIV_SEL_1;
case 3:
return BXT_CDCLK_CD2X_DIV_SEL_1_5;
case 4:
return BXT_CDCLK_CD2X_DIV_SEL_2;
case 8:
return BXT_CDCLK_CD2X_DIV_SEL_4;
}
}
static u32 cdclk_squash_waveform(struct drm_i915_private *dev_priv,
int cdclk)
{
const struct intel_cdclk_vals *table = dev_priv->cdclk.table;
int i;
if (cdclk == dev_priv->cdclk.hw.bypass)
return 0;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == dev_priv->cdclk.hw.ref &&
table[i].cdclk == cdclk)
return table[i].waveform;
drm_WARN(&dev_priv->drm, 1, "cdclk %d not valid for refclk %u\n",
cdclk, dev_priv->cdclk.hw.ref);
return 0xffff;
}
static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
int vco = cdclk_config->vco;
u32 val;
u16 waveform;
int clock;
int ret;
/* Inform power controller of upcoming frequency change. */
if (DISPLAY_VER(dev_priv) >= 11)
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);
else
/*
* BSpec requires us to wait up to 150usec, but that leads to
* timeouts; the 2ms used here is based on experiment.
*/
ret = snb_pcode_write_timeout(dev_priv,
HSW_PCODE_DE_WRITE_FREQ_REQ,
0x80000000, 150, 2);
if (ret) {
drm_err(&dev_priv->drm,
"Failed to inform PCU about cdclk change (err %d, freq %d)\n",
ret, cdclk);
return;
}
if (HAS_CDCLK_CRAWL(dev_priv) && dev_priv->cdclk.hw.vco > 0 && vco > 0) {
if (dev_priv->cdclk.hw.vco != vco)
adlp_cdclk_pll_crawl(dev_priv, vco);
} else if (DISPLAY_VER(dev_priv) >= 11) {
if (dev_priv->cdclk.hw.vco != 0 &&
dev_priv->cdclk.hw.vco != vco)
icl_cdclk_pll_disable(dev_priv);
if (dev_priv->cdclk.hw.vco != vco)
icl_cdclk_pll_enable(dev_priv, vco);
} else {
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);
}
waveform = cdclk_squash_waveform(dev_priv, cdclk);
if (waveform)
clock = vco / 2;
else
clock = cdclk;
if (has_cdclk_squasher(dev_priv)) {
u32 squash_ctl = 0;
if (waveform)
squash_ctl = CDCLK_SQUASH_ENABLE |
CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;
intel_de_write(dev_priv, CDCLK_SQUASH_CTL, squash_ctl);
}
val = bxt_cdclk_cd2x_div_sel(dev_priv, clock, vco) |
bxt_cdclk_cd2x_pipe(dev_priv, pipe) |
skl_cdclk_decimal(cdclk);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
intel_de_write(dev_priv, CDCLK_CTL, val);
if (pipe != INVALID_PIPE)
intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(dev_priv, pipe));
if (DISPLAY_VER(dev_priv) >= 11) {
ret = snb_pcode_write(dev_priv, SKL_PCODE_CDCLK_CONTROL,
cdclk_config->voltage_level);
} else {
/*
* 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 = snb_pcode_write_timeout(dev_priv,
HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_config->voltage_level,
150, 2);
}
if (ret) {
drm_err(&dev_priv->drm,
"PCode CDCLK freq set failed, (err %d, freq %d)\n",
ret, cdclk);
return;
}
intel_update_cdclk(dev_priv);
if (DISPLAY_VER(dev_priv) >= 11)
/*
* Can't read out the voltage level :(
* Let's just assume everything is as expected.
*/
dev_priv->cdclk.hw.voltage_level = cdclk_config->voltage_level;
}
static void bxt_sanitize_cdclk(struct drm_i915_private *dev_priv)
{
u32 cdctl, expected;
int cdclk, clock, vco;
intel_update_cdclk(dev_priv);
intel_cdclk_dump_config(dev_priv, &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 = intel_de_read(dev_priv, 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(dev_priv, INVALID_PIPE);
/* Make sure this is a legal cdclk value for the platform */
cdclk = bxt_calc_cdclk(dev_priv, dev_priv->cdclk.hw.cdclk);
if (cdclk != dev_priv->cdclk.hw.cdclk)
goto sanitize;
/* Make sure the VCO is correct for the cdclk */
vco = bxt_calc_cdclk_pll_vco(dev_priv, cdclk);
if (vco != dev_priv->cdclk.hw.vco)
goto sanitize;
expected = skl_cdclk_decimal(cdclk);
/* Figure out what CD2X divider we should be using for this cdclk */
if (has_cdclk_squasher(dev_priv))
clock = dev_priv->cdclk.hw.vco / 2;
else
clock = dev_priv->cdclk.hw.cdclk;
expected |= bxt_cdclk_cd2x_div_sel(dev_priv, clock,
dev_priv->cdclk.hw.vco);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
if ((IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) &&
dev_priv->cdclk.hw.cdclk >= 500000)
expected |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
drm_dbg_kms(&dev_priv->drm, "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 void bxt_cdclk_init_hw(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_config cdclk_config;
bxt_sanitize_cdclk(dev_priv);
if (dev_priv->cdclk.hw.cdclk != 0 &&
dev_priv->cdclk.hw.vco != 0)
return;
cdclk_config = 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.
*/
cdclk_config.cdclk = bxt_calc_cdclk(dev_priv, 0);
cdclk_config.vco = bxt_calc_cdclk_pll_vco(dev_priv, cdclk_config.cdclk);
cdclk_config.voltage_level =
intel_cdclk_calc_voltage_level(dev_priv, cdclk_config.cdclk);
bxt_set_cdclk(dev_priv, &cdclk_config, INVALID_PIPE);
}
static void bxt_cdclk_uninit_hw(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_config cdclk_config = dev_priv->cdclk.hw;
cdclk_config.cdclk = cdclk_config.bypass;
cdclk_config.vco = 0;
cdclk_config.voltage_level =
intel_cdclk_calc_voltage_level(dev_priv, cdclk_config.cdclk);
bxt_set_cdclk(dev_priv, &cdclk_config, INVALID_PIPE);
}
/**
* intel_cdclk_init_hw - Initialize CDCLK hardware
* @i915: i915 device
*
* Initialize CDCLK. 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 intel_cdclk_init_hw(struct drm_i915_private *i915)
{
if (DISPLAY_VER(i915) >= 10 || IS_BROXTON(i915))
bxt_cdclk_init_hw(i915);
else if (DISPLAY_VER(i915) == 9)
skl_cdclk_init_hw(i915);
}
/**
* intel_cdclk_uninit_hw - Uninitialize CDCLK hardware
* @i915: i915 device
*
* Uninitialize CDCLK. This is done only during the display core
* uninitialization sequence.
*/
void intel_cdclk_uninit_hw(struct drm_i915_private *i915)
{
if (DISPLAY_VER(i915) >= 10 || IS_BROXTON(i915))
bxt_cdclk_uninit_hw(i915);
else if (DISPLAY_VER(i915) == 9)
skl_cdclk_uninit_hw(i915);
}
static bool intel_cdclk_can_crawl(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
int a_div, b_div;
if (!HAS_CDCLK_CRAWL(dev_priv))
return false;
/*
* The vco and cd2x divider will change independently
* from each, so we disallow cd2x change when crawling.
*/
a_div = DIV_ROUND_CLOSEST(a->vco, a->cdclk);
b_div = DIV_ROUND_CLOSEST(b->vco, b->cdclk);
return a->vco != 0 && b->vco != 0 &&
a->vco != b->vco &&
a_div == b_div &&
a->ref == b->ref;
}
static bool intel_cdclk_can_squash(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
/*
* FIXME should store a bit more state in intel_cdclk_config
* to differentiate squasher vs. cd2x divider properly. For
* the moment all platforms with squasher use a fixed cd2x
* divider.
*/
if (!has_cdclk_squasher(dev_priv))
return false;
return a->cdclk != b->cdclk &&
a->vco != 0 &&
a->vco == b->vco &&
a->ref == b->ref;
}
/**
* intel_cdclk_needs_modeset - Determine if changong between the CDCLK
* configurations requires a modeset on all pipes
* @a: first CDCLK configuration
* @b: second CDCLK configuration
*
* Returns:
* True if changing between the two CDCLK configurations
* requires all pipes to be off, false if not.
*/
bool intel_cdclk_needs_modeset(const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
return a->cdclk != b->cdclk ||
a->vco != b->vco ||
a->ref != b->ref;
}
/**
* intel_cdclk_can_cd2x_update - Determine if changing between the two CDCLK
* configurations requires only a cd2x divider update
* @dev_priv: i915 device
* @a: first CDCLK configuration
* @b: second CDCLK configuration
*
* Returns:
* True if changing between the two CDCLK configurations
* can be done with just a cd2x divider update, false if not.
*/
static bool intel_cdclk_can_cd2x_update(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
/* Older hw doesn't have the capability */
if (DISPLAY_VER(dev_priv) < 10 && !IS_BROXTON(dev_priv))
return false;
/*
* FIXME should store a bit more state in intel_cdclk_config
* to differentiate squasher vs. cd2x divider properly. For
* the moment all platforms with squasher use a fixed cd2x
* divider.
*/
if (has_cdclk_squasher(dev_priv))
return false;
return a->cdclk != b->cdclk &&
a->vco != 0 &&
a->vco == b->vco &&
a->ref == b->ref;
}
/**
* intel_cdclk_changed - Determine if two CDCLK configurations are different
* @a: first CDCLK configuration
* @b: second CDCLK configuration
*
* Returns:
* True if the CDCLK configurations don't match, false if they do.
*/
static bool intel_cdclk_changed(const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
return intel_cdclk_needs_modeset(a, b) ||
a->voltage_level != b->voltage_level;
}
void intel_cdclk_dump_config(struct drm_i915_private *i915,
const struct intel_cdclk_config *cdclk_config,
const char *context)
{
drm_dbg_kms(&i915->drm, "%s %d kHz, VCO %d kHz, ref %d kHz, bypass %d kHz, voltage level %d\n",
context, cdclk_config->cdclk, cdclk_config->vco,
cdclk_config->ref, cdclk_config->bypass,
cdclk_config->voltage_level);
}
/**
* intel_set_cdclk - Push the CDCLK configuration to the hardware
* @dev_priv: i915 device
* @cdclk_config: new CDCLK configuration
* @pipe: pipe with which to synchronize the update
*
* Program the hardware based on the passed in CDCLK state,
* if necessary.
*/
static void intel_set_cdclk(struct drm_i915_private *dev_priv,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct intel_encoder *encoder;
if (!intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_config))
return;
if (drm_WARN_ON_ONCE(&dev_priv->drm, !dev_priv->cdclk_funcs->set_cdclk))
return;
intel_cdclk_dump_config(dev_priv, cdclk_config, "Changing CDCLK to");
for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
intel_psr_pause(intel_dp);
}
intel_audio_cdclk_change_pre(dev_priv);
/*
* Lock aux/gmbus while we change cdclk in case those
* functions use cdclk. Not all platforms/ports do,
* but we'll lock them all for simplicity.
*/
mutex_lock(&dev_priv->gmbus_mutex);
for_each_intel_dp(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
mutex_lock_nest_lock(&intel_dp->aux.hw_mutex,
&dev_priv->gmbus_mutex);
}
intel_cdclk_set_cdclk(dev_priv, cdclk_config, pipe);
for_each_intel_dp(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
mutex_unlock(&intel_dp->aux.hw_mutex);
}
mutex_unlock(&dev_priv->gmbus_mutex);
for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
intel_psr_resume(intel_dp);
}
intel_audio_cdclk_change_post(dev_priv);
if (drm_WARN(&dev_priv->drm,
intel_cdclk_changed(&dev_priv->cdclk.hw, cdclk_config),
"cdclk state doesn't match!\n")) {
intel_cdclk_dump_config(dev_priv, &dev_priv->cdclk.hw, "[hw state]");
intel_cdclk_dump_config(dev_priv, cdclk_config, "[sw state]");
}
}
/**
* intel_set_cdclk_pre_plane_update - Push the CDCLK state to the hardware
* @state: intel atomic state
*
* Program the hardware before updating the HW plane state based on the
* new CDCLK state, if necessary.
*/
void
intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
const struct intel_cdclk_state *old_cdclk_state =
intel_atomic_get_old_cdclk_state(state);
const struct intel_cdclk_state *new_cdclk_state =
intel_atomic_get_new_cdclk_state(state);
enum pipe pipe = new_cdclk_state->pipe;
if (!intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual))
return;
if (pipe == INVALID_PIPE ||
old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) {
drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
}
}
/**
* intel_set_cdclk_post_plane_update - Push the CDCLK state to the hardware
* @state: intel atomic state
*
* Program the hardware after updating the HW plane state based on the
* new CDCLK state, if necessary.
*/
void
intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
const struct intel_cdclk_state *old_cdclk_state =
intel_atomic_get_old_cdclk_state(state);
const struct intel_cdclk_state *new_cdclk_state =
intel_atomic_get_new_cdclk_state(state);
enum pipe pipe = new_cdclk_state->pipe;
if (!intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual))
return;
if (pipe != INVALID_PIPE &&
old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk) {
drm_WARN_ON(&dev_priv->drm, !new_cdclk_state->base.changed);
intel_set_cdclk(dev_priv, &new_cdclk_state->actual, pipe);
}
}
static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev);
int pixel_rate = crtc_state->pixel_rate;
if (DISPLAY_VER(dev_priv) >= 10)
return DIV_ROUND_UP(pixel_rate, 2);
else if (DISPLAY_VER(dev_priv) == 9 ||
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 if (crtc_state->double_wide)
return DIV_ROUND_UP(pixel_rate * 100, 90 * 2);
else
return DIV_ROUND_UP(pixel_rate * 100, 90);
}
static int intel_planes_min_cdclk(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
struct intel_plane *plane;
int min_cdclk = 0;
for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane)
min_cdclk = max(crtc_state->min_cdclk[plane->id], min_cdclk);
return min_cdclk;
}
int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *dev_priv =
to_i915(crtc_state->uapi.crtc->dev);
int min_cdclk;
if (!crtc_state->hw.enable)
return 0;
min_cdclk = intel_pixel_rate_to_cdclk(crtc_state);
/* 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 (DISPLAY_VER(dev_priv) == 10) {
/* Display WA #1145: glk */
min_cdclk = max(316800, min_cdclk);
} else if (DISPLAY_VER(dev_priv) == 9 || 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.
*/
if (crtc_state->has_audio && DISPLAY_VER(dev_priv) >= 9)
min_cdclk = max(2 * 96000, min_cdclk);
/*
* "For DP audio configuration, cdclk frequency shall be set to
* meet the following requirements:
* DP Link Frequency(MHz) | Cdclk frequency(MHz)
* 270 | 320 or higher
* 162 | 200 or higher"
*/
if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
intel_crtc_has_dp_encoder(crtc_state) && crtc_state->has_audio)
min_cdclk = max(crtc_state->port_clock, 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);
/*
* On Geminilake once the CDCLK gets as low as 79200
* picture gets unstable, despite that values are
* correct for DSI PLL and DE PLL.
*/
if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI) &&
IS_GEMINILAKE(dev_priv))
min_cdclk = max(158400, min_cdclk);
/* Account for additional needs from the planes */
min_cdclk = max(intel_planes_min_cdclk(crtc_state), min_cdclk);
/*
* When we decide to use only one VDSC engine, since
* each VDSC operates with 1 ppc throughput, pixel clock
* cannot be higher than the VDSC clock (cdclk)
*/
if (crtc_state->dsc.compression_enable && !crtc_state->dsc.dsc_split)
min_cdclk = max(min_cdclk, (int)crtc_state->pixel_rate);
/*
* HACK. Currently for TGL platforms we calculate
* min_cdclk initially based on pixel_rate divided
* by 2, accounting for also plane requirements,
* however in some cases the lowest possible CDCLK
* doesn't work and causing the underruns.
* Explicitly stating here that this seems to be currently
* rather a Hack, than final solution.
*/
if (IS_TIGERLAKE(dev_priv)) {
/*
* Clamp to max_cdclk_freq in case pixel rate is higher,
* in order not to break an 8K, but still leave W/A at place.
*/
min_cdclk = max_t(int, min_cdclk,
min_t(int, crtc_state->pixel_rate,
dev_priv->max_cdclk_freq));
}
if (min_cdclk > dev_priv->max_cdclk_freq) {
drm_dbg_kms(&dev_priv->drm,
"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 intel_cdclk_state *cdclk_state)
{
struct intel_atomic_state *state = cdclk_state->base.state;
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct intel_bw_state *bw_state = NULL;
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
int min_cdclk, i;
enum pipe pipe;
for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
int ret;
min_cdclk = intel_crtc_compute_min_cdclk(crtc_state);
if (min_cdclk < 0)
return min_cdclk;
bw_state = intel_atomic_get_bw_state(state);
if (IS_ERR(bw_state))
return PTR_ERR(bw_state);
if (cdclk_state->min_cdclk[crtc->pipe] == min_cdclk)
continue;
cdclk_state->min_cdclk[crtc->pipe] = min_cdclk;
ret = intel_atomic_lock_global_state(&cdclk_state->base);
if (ret)
return ret;
}
min_cdclk = cdclk_state->force_min_cdclk;
for_each_pipe(dev_priv, pipe) {
min_cdclk = max(cdclk_state->min_cdclk[pipe], min_cdclk);
if (!bw_state)
continue;
min_cdclk = max(bw_state->min_cdclk, min_cdclk);
}
return min_cdclk;
}
/*
* Account for port clock min voltage level requirements.
* This only really does something on DISPLA_VER >= 11 but can be
* called on earlier platforms as well.
*
* 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 int bxt_compute_min_voltage_level(struct intel_cdclk_state *cdclk_state)
{
struct intel_atomic_state *state = cdclk_state->base.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;
for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
int ret;
if (crtc_state->hw.enable)
min_voltage_level = crtc_state->min_voltage_level;
else
min_voltage_level = 0;
if (cdclk_state->min_voltage_level[crtc->pipe] == min_voltage_level)
continue;
cdclk_state->min_voltage_level[crtc->pipe] = min_voltage_level;
ret = intel_atomic_lock_global_state(&cdclk_state->base);
if (ret)
return ret;
}
min_voltage_level = 0;
for_each_pipe(dev_priv, pipe)
min_voltage_level = max(cdclk_state->min_voltage_level[pipe],
min_voltage_level);
return min_voltage_level;
}
static int vlv_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
{
struct intel_atomic_state *state = cdclk_state->base.state;
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(cdclk_state);
if (min_cdclk < 0)
return min_cdclk;
cdclk = vlv_calc_cdclk(dev_priv, min_cdclk);
cdclk_state->logical.cdclk = cdclk;
cdclk_state->logical.voltage_level =
vlv_calc_voltage_level(dev_priv, cdclk);
if (!cdclk_state->active_pipes) {
cdclk = vlv_calc_cdclk(dev_priv, cdclk_state->force_min_cdclk);
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
vlv_calc_voltage_level(dev_priv, cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int bdw_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
{
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(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);
cdclk_state->logical.cdclk = cdclk;
cdclk_state->logical.voltage_level =
bdw_calc_voltage_level(cdclk);
if (!cdclk_state->active_pipes) {
cdclk = bdw_calc_cdclk(cdclk_state->force_min_cdclk);
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
bdw_calc_voltage_level(cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int skl_dpll0_vco(struct intel_cdclk_state *cdclk_state)
{
struct intel_atomic_state *state = cdclk_state->base.state;
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
int vco, i;
vco = cdclk_state->logical.vco;
if (!vco)
vco = dev_priv->skl_preferred_vco_freq;
for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
if (!crtc_state->hw.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 intel_cdclk_state *cdclk_state)
{
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(cdclk_state);
if (min_cdclk < 0)
return min_cdclk;
vco = skl_dpll0_vco(cdclk_state);
/*
* FIXME should also account for plane ratio
* once 64bpp pixel formats are supported.
*/
cdclk = skl_calc_cdclk(min_cdclk, vco);
cdclk_state->logical.vco = vco;
cdclk_state->logical.cdclk = cdclk;
cdclk_state->logical.voltage_level =
skl_calc_voltage_level(cdclk);
if (!cdclk_state->active_pipes) {
cdclk = skl_calc_cdclk(cdclk_state->force_min_cdclk, vco);
cdclk_state->actual.vco = vco;
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
skl_calc_voltage_level(cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int bxt_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
{
struct intel_atomic_state *state = cdclk_state->base.state;
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
int min_cdclk, min_voltage_level, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(cdclk_state);
if (min_cdclk < 0)
return min_cdclk;
min_voltage_level = bxt_compute_min_voltage_level(cdclk_state);
if (min_voltage_level < 0)
return min_voltage_level;
cdclk = bxt_calc_cdclk(dev_priv, min_cdclk);
vco = bxt_calc_cdclk_pll_vco(dev_priv, cdclk);
cdclk_state->logical.vco = vco;
cdclk_state->logical.cdclk = cdclk;
cdclk_state->logical.voltage_level =
max_t(int, min_voltage_level,
intel_cdclk_calc_voltage_level(dev_priv, cdclk));
if (!cdclk_state->active_pipes) {
cdclk = bxt_calc_cdclk(dev_priv, cdclk_state->force_min_cdclk);
vco = bxt_calc_cdclk_pll_vco(dev_priv, cdclk);
cdclk_state->actual.vco = vco;
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
intel_cdclk_calc_voltage_level(dev_priv, cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int fixed_modeset_calc_cdclk(struct intel_cdclk_state *cdclk_state)
{
int min_cdclk;
/*
* We can't change the cdclk frequency, but we still want to
* check that the required minimum frequency doesn't exceed
* the actual cdclk frequency.
*/
min_cdclk = intel_compute_min_cdclk(cdclk_state);
if (min_cdclk < 0)
return min_cdclk;
return 0;
}
static struct intel_global_state *intel_cdclk_duplicate_state(struct intel_global_obj *obj)
{
struct intel_cdclk_state *cdclk_state;
cdclk_state = kmemdup(obj->state, sizeof(*cdclk_state), GFP_KERNEL);
if (!cdclk_state)
return NULL;
cdclk_state->pipe = INVALID_PIPE;
return &cdclk_state->base;
}
static void intel_cdclk_destroy_state(struct intel_global_obj *obj,
struct intel_global_state *state)
{
kfree(state);
}
static const struct intel_global_state_funcs intel_cdclk_funcs = {
.atomic_duplicate_state = intel_cdclk_duplicate_state,
.atomic_destroy_state = intel_cdclk_destroy_state,
};
struct intel_cdclk_state *
intel_atomic_get_cdclk_state(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
struct intel_global_state *cdclk_state;
cdclk_state = intel_atomic_get_global_obj_state(state, &dev_priv->cdclk.obj);
if (IS_ERR(cdclk_state))
return ERR_CAST(cdclk_state);
return to_intel_cdclk_state(cdclk_state);
}
int intel_cdclk_atomic_check(struct intel_atomic_state *state,
bool *need_cdclk_calc)
{
struct drm_i915_private *i915 = to_i915(state->base.dev);
const struct intel_cdclk_state *old_cdclk_state;
const struct intel_cdclk_state *new_cdclk_state;
struct intel_plane_state *plane_state;
struct intel_bw_state *new_bw_state;
struct intel_plane *plane;
int min_cdclk = 0;
enum pipe pipe;
int ret;
int i;
/*
* active_planes bitmask has been updated, and potentially affected
* planes are part of the state. We can now compute the minimum cdclk
* for each plane.
*/
for_each_new_intel_plane_in_state(state, plane, plane_state, i) {
ret = intel_plane_calc_min_cdclk(state, plane, need_cdclk_calc);
if (ret)
return ret;
}
old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
new_cdclk_state = intel_atomic_get_new_cdclk_state(state);
if (new_cdclk_state &&
old_cdclk_state->force_min_cdclk != new_cdclk_state->force_min_cdclk)
*need_cdclk_calc = true;
ret = intel_cdclk_bw_calc_min_cdclk(state);
if (ret)
return ret;
new_bw_state = intel_atomic_get_new_bw_state(state);
if (!new_cdclk_state || !new_bw_state)
return 0;
for_each_pipe(i915, pipe) {
min_cdclk = max(new_cdclk_state->min_cdclk[pipe], min_cdclk);
/* Currently do this change only if we need to increase */
if (new_bw_state->min_cdclk > min_cdclk)
*need_cdclk_calc = true;
}
return 0;
}
int intel_cdclk_init(struct drm_i915_private *dev_priv)
{
struct intel_cdclk_state *cdclk_state;
cdclk_state = kzalloc(sizeof(*cdclk_state), GFP_KERNEL);
if (!cdclk_state)
return -ENOMEM;
intel_atomic_global_obj_init(dev_priv, &dev_priv->cdclk.obj,
&cdclk_state->base, &intel_cdclk_funcs);
return 0;
}
int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
{
struct drm_i915_private *dev_priv = to_i915(state->base.dev);
const struct intel_cdclk_state *old_cdclk_state;
struct intel_cdclk_state *new_cdclk_state;
enum pipe pipe = INVALID_PIPE;
int ret;
new_cdclk_state = intel_atomic_get_cdclk_state(state);
if (IS_ERR(new_cdclk_state))
return PTR_ERR(new_cdclk_state);
old_cdclk_state = intel_atomic_get_old_cdclk_state(state);
new_cdclk_state->active_pipes =
intel_calc_active_pipes(state, old_cdclk_state->active_pipes);
ret = intel_cdclk_modeset_calc_cdclk(dev_priv, new_cdclk_state);
if (ret)
return ret;
if (intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
/*
* Also serialize commits across all crtcs
* if the actual hw needs to be poked.
*/
ret = intel_atomic_serialize_global_state(&new_cdclk_state->base);
if (ret)
return ret;
} else if (old_cdclk_state->active_pipes != new_cdclk_state->active_pipes ||
old_cdclk_state->force_min_cdclk != new_cdclk_state->force_min_cdclk ||
intel_cdclk_changed(&old_cdclk_state->logical,
&new_cdclk_state->logical)) {
ret = intel_atomic_lock_global_state(&new_cdclk_state->base);
if (ret)
return ret;
} else {
return 0;
}
if (is_power_of_2(new_cdclk_state->active_pipes) &&
intel_cdclk_can_cd2x_update(dev_priv,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
pipe = ilog2(new_cdclk_state->active_pipes);
crtc = intel_crtc_for_pipe(dev_priv, pipe);
crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
if (drm_atomic_crtc_needs_modeset(&crtc_state->uapi))
pipe = INVALID_PIPE;
}
if (intel_cdclk_can_squash(dev_priv,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
drm_dbg_kms(&dev_priv->drm,
"Can change cdclk via squasher\n");
} else if (intel_cdclk_can_crawl(dev_priv,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
drm_dbg_kms(&dev_priv->drm,
"Can change cdclk via crawl\n");
} else if (pipe != INVALID_PIPE) {
new_cdclk_state->pipe = pipe;
drm_dbg_kms(&dev_priv->drm,
"Can change cdclk cd2x divider with pipe %c active\n",
pipe_name(pipe));
} else if (intel_cdclk_needs_modeset(&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
/* All pipes must be switched off while we change the cdclk. */
ret = intel_modeset_all_pipes(state);
if (ret)
return ret;
drm_dbg_kms(&dev_priv->drm,
"Modeset required for cdclk change\n");
}
drm_dbg_kms(&dev_priv->drm,
"New cdclk calculated to be logical %u kHz, actual %u kHz\n",
new_cdclk_state->logical.cdclk,
new_cdclk_state->actual.cdclk);
drm_dbg_kms(&dev_priv->drm,
"New voltage level calculated to be logical %u, actual %u\n",
new_cdclk_state->logical.voltage_level,
new_cdclk_state->actual.voltage_level);
return 0;
}
static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
{
int max_cdclk_freq = dev_priv->max_cdclk_freq;
if (DISPLAY_VER(dev_priv) >= 10)
return 2 * max_cdclk_freq;
else if (DISPLAY_VER(dev_priv) == 9 ||
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 (DISPLAY_VER(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_JSL_EHL(dev_priv)) {
if (dev_priv->cdclk.hw.ref == 24000)
dev_priv->max_cdclk_freq = 552000;
else
dev_priv->max_cdclk_freq = 556800;
} else if (DISPLAY_VER(dev_priv) >= 11) {
if (dev_priv->cdclk.hw.ref == 24000)
dev_priv->max_cdclk_freq = 648000;
else
dev_priv->max_cdclk_freq = 652800;
} 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 (DISPLAY_VER(dev_priv) == 9) {
u32 limit = intel_de_read(dev_priv, SKL_DFSM) & SKL_DFSM_CDCLK_LIMIT_MASK;
int max_cdclk, vco;
vco = dev_priv->skl_preferred_vco_freq;
drm_WARN_ON(&dev_priv->drm, 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_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 (intel_de_read(dev_priv, 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_dbg(&dev_priv->drm, "Max CD clock rate: %d kHz\n",
dev_priv->max_cdclk_freq);
drm_dbg(&dev_priv->drm, "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)
{
intel_cdclk_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))
intel_de_write(dev_priv, GMBUSFREQ_VLV,
DIV_ROUND_UP(dev_priv->cdclk.hw.cdclk, 1000));
}
static int dg1_rawclk(struct drm_i915_private *dev_priv)
{
/*
* DG1 always uses a 38.4 MHz rawclk. The bspec tells us
* "Program Numerator=2, Denominator=4, Divider=37 decimal."
*/
intel_de_write(dev_priv, PCH_RAWCLK_FREQ,
CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));
return 38400;
}
static int cnp_rawclk(struct drm_i915_private *dev_priv)
{
u32 rawclk;
int divider, fraction;
if (intel_de_read(dev_priv, 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);
if (fraction) {
int numerator = 1;
rawclk |= CNP_RAWCLK_DEN(DIV_ROUND_CLOSEST(numerator * 1000,
fraction) - 1);
if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
rawclk |= ICP_RAWCLK_NUM(numerator);
}
intel_de_write(dev_priv, PCH_RAWCLK_FREQ, rawclk);
return divider + fraction;
}
static int pch_rawclk(struct drm_i915_private *dev_priv)
{
return (intel_de_read(dev_priv, 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 i9xx_hrawclk(struct drm_i915_private *dev_priv)
{
u32 clkcfg;
/*
* hrawclock is 1/4 the FSB frequency
*
* Note that this only reads the state of the FSB
* straps, not the actual FSB frequency. Some BIOSen
* let you configure each independently. Ideally we'd
* read out the actual FSB frequency but sadly we
* don't know which registers have that information,
* and all the relevant docs have gone to bit heaven :(
*/
clkcfg = intel_de_read(dev_priv, CLKCFG) & CLKCFG_FSB_MASK;
if (IS_MOBILE(dev_priv)) {
switch (clkcfg) {
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:
return 266667;
case CLKCFG_FSB_1333:
return 333333;
default:
MISSING_CASE(clkcfg);
return 133333;
}
} else {
switch (clkcfg) {
case CLKCFG_FSB_400_ALT:
return 100000;
case CLKCFG_FSB_533:
return 133333;
case CLKCFG_FSB_667:
return 166667;
case CLKCFG_FSB_800:
return 200000;
case CLKCFG_FSB_1067_ALT:
return 266667;
case CLKCFG_FSB_1333_ALT:
return 333333;
case CLKCFG_FSB_1600_ALT:
return 400000;
default:
return 133333;
}
}
}
/**
* intel_read_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.
*/
u32 intel_read_rawclk(struct drm_i915_private *dev_priv)
{
u32 freq;
if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
freq = dg1_rawclk(dev_priv);
else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
freq = cnp_rawclk(dev_priv);
else if (HAS_PCH_SPLIT(dev_priv))
freq = pch_rawclk(dev_priv);
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
freq = vlv_hrawclk(dev_priv);
else if (DISPLAY_VER(dev_priv) >= 3)
freq = i9xx_hrawclk(dev_priv);
else
/* no rawclk on other platforms, or no need to know it */
return 0;
return freq;
}
static const struct intel_cdclk_funcs tgl_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.bw_calc_min_cdclk = skl_bw_calc_min_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = tgl_calc_voltage_level,
};
static const struct intel_cdclk_funcs ehl_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.bw_calc_min_cdclk = skl_bw_calc_min_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = ehl_calc_voltage_level,
};
static const struct intel_cdclk_funcs icl_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.bw_calc_min_cdclk = skl_bw_calc_min_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = icl_calc_voltage_level,
};
static const struct intel_cdclk_funcs bxt_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.bw_calc_min_cdclk = skl_bw_calc_min_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = bxt_calc_voltage_level,
};
static const struct intel_cdclk_funcs skl_cdclk_funcs = {
.get_cdclk = skl_get_cdclk,
.set_cdclk = skl_set_cdclk,
.bw_calc_min_cdclk = skl_bw_calc_min_cdclk,
.modeset_calc_cdclk = skl_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs bdw_cdclk_funcs = {
.get_cdclk = bdw_get_cdclk,
.set_cdclk = bdw_set_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = bdw_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs chv_cdclk_funcs = {
.get_cdclk = vlv_get_cdclk,
.set_cdclk = chv_set_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = vlv_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs vlv_cdclk_funcs = {
.get_cdclk = vlv_get_cdclk,
.set_cdclk = vlv_set_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = vlv_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs hsw_cdclk_funcs = {
.get_cdclk = hsw_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/* SNB, IVB, 965G, 945G */
static const struct intel_cdclk_funcs fixed_400mhz_cdclk_funcs = {
.get_cdclk = fixed_400mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs ilk_cdclk_funcs = {
.get_cdclk = fixed_450mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs gm45_cdclk_funcs = {
.get_cdclk = gm45_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/* G45 uses G33 */
static const struct intel_cdclk_funcs i965gm_cdclk_funcs = {
.get_cdclk = i965gm_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/* i965G uses fixed 400 */
static const struct intel_cdclk_funcs pnv_cdclk_funcs = {
.get_cdclk = pnv_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs g33_cdclk_funcs = {
.get_cdclk = g33_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i945gm_cdclk_funcs = {
.get_cdclk = i945gm_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/* i945G uses fixed 400 */
static const struct intel_cdclk_funcs i915gm_cdclk_funcs = {
.get_cdclk = i915gm_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i915g_cdclk_funcs = {
.get_cdclk = fixed_333mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i865g_cdclk_funcs = {
.get_cdclk = fixed_266mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i85x_cdclk_funcs = {
.get_cdclk = i85x_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i845g_cdclk_funcs = {
.get_cdclk = fixed_200mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i830_cdclk_funcs = {
.get_cdclk = fixed_133mhz_get_cdclk,
.bw_calc_min_cdclk = intel_bw_calc_min_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/**
* 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_DG2(dev_priv)) {
dev_priv->cdclk_funcs = &tgl_cdclk_funcs;
dev_priv->cdclk.table = dg2_cdclk_table;
} else if (IS_ALDERLAKE_P(dev_priv)) {
dev_priv->cdclk_funcs = &tgl_cdclk_funcs;
/* Wa_22011320316:adl-p[a0] */
if (IS_ADLP_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0))
dev_priv->cdclk.table = adlp_a_step_cdclk_table;
else
dev_priv->cdclk.table = adlp_cdclk_table;
} else if (IS_ROCKETLAKE(dev_priv)) {
dev_priv->cdclk_funcs = &tgl_cdclk_funcs;
dev_priv->cdclk.table = rkl_cdclk_table;
} else if (DISPLAY_VER(dev_priv) >= 12) {
dev_priv->cdclk_funcs = &tgl_cdclk_funcs;
dev_priv->cdclk.table = icl_cdclk_table;
} else if (IS_JSL_EHL(dev_priv)) {
dev_priv->cdclk_funcs = &ehl_cdclk_funcs;
dev_priv->cdclk.table = icl_cdclk_table;
} else if (DISPLAY_VER(dev_priv) >= 11) {
dev_priv->cdclk_funcs = &icl_cdclk_funcs;
dev_priv->cdclk.table = icl_cdclk_table;
} else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
dev_priv->cdclk_funcs = &bxt_cdclk_funcs;
if (IS_GEMINILAKE(dev_priv))
dev_priv->cdclk.table = glk_cdclk_table;
else
dev_priv->cdclk.table = bxt_cdclk_table;
} else if (DISPLAY_VER(dev_priv) == 9) {
dev_priv->cdclk_funcs = &skl_cdclk_funcs;
} else if (IS_BROADWELL(dev_priv)) {
dev_priv->cdclk_funcs = &bdw_cdclk_funcs;
} else if (IS_HASWELL(dev_priv)) {
dev_priv->cdclk_funcs = &hsw_cdclk_funcs;
} else if (IS_CHERRYVIEW(dev_priv)) {
dev_priv->cdclk_funcs = &chv_cdclk_funcs;
} else if (IS_VALLEYVIEW(dev_priv)) {
dev_priv->cdclk_funcs = &vlv_cdclk_funcs;
} else if (IS_SANDYBRIDGE(dev_priv) || IS_IVYBRIDGE(dev_priv)) {
dev_priv->cdclk_funcs = &fixed_400mhz_cdclk_funcs;
} else if (IS_IRONLAKE(dev_priv)) {
dev_priv->cdclk_funcs = &ilk_cdclk_funcs;
} else if (IS_GM45(dev_priv)) {
dev_priv->cdclk_funcs = &gm45_cdclk_funcs;
} else if (IS_G45(dev_priv)) {
dev_priv->cdclk_funcs = &g33_cdclk_funcs;
} else if (IS_I965GM(dev_priv)) {
dev_priv->cdclk_funcs = &i965gm_cdclk_funcs;
} else if (IS_I965G(dev_priv)) {
dev_priv->cdclk_funcs = &fixed_400mhz_cdclk_funcs;
} else if (IS_PINEVIEW(dev_priv)) {
dev_priv->cdclk_funcs = &pnv_cdclk_funcs;
} else if (IS_G33(dev_priv)) {
dev_priv->cdclk_funcs = &g33_cdclk_funcs;
} else if (IS_I945GM(dev_priv)) {
dev_priv->cdclk_funcs = &i945gm_cdclk_funcs;
} else if (IS_I945G(dev_priv)) {
dev_priv->cdclk_funcs = &fixed_400mhz_cdclk_funcs;
} else if (IS_I915GM(dev_priv)) {
dev_priv->cdclk_funcs = &i915gm_cdclk_funcs;
} else if (IS_I915G(dev_priv)) {
dev_priv->cdclk_funcs = &i915g_cdclk_funcs;
} else if (IS_I865G(dev_priv)) {
dev_priv->cdclk_funcs = &i865g_cdclk_funcs;
} else if (IS_I85X(dev_priv)) {
dev_priv->cdclk_funcs = &i85x_cdclk_funcs;
} else if (IS_I845G(dev_priv)) {
dev_priv->cdclk_funcs = &i845g_cdclk_funcs;
} else if (IS_I830(dev_priv)) {
dev_priv->cdclk_funcs = &i830_cdclk_funcs;
}
if (drm_WARN(&dev_priv->drm, !dev_priv->cdclk_funcs,
"Unknown platform. Assuming i830\n"))
dev_priv->cdclk_funcs = &i830_cdclk_funcs;
}
Reference in a new issue View git blame Copy permalink