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JustOS/linux-6.13/drivers/gpu/drm/i915/display/intel_cdclk.c
justuser 02e73b8cd9 up
2025-01-24 17:00:19 +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 <linux/debugfs.h>
#include <linux/time.h>
#include <drm/drm_fixed.h>
#include "soc/intel_dram.h"
#include "hsw_ips.h"
#include "i915_reg.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_dp.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 "intel_vdsc.h"
#include "skl_watermark.h"
#include "skl_watermark_regs.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.
*
* There are multiple components involved in the generation of the CDCLK
* frequency:
*
* - We have the CDCLK PLL, which generates an output clock based on a
* reference clock and a ratio parameter.
* - The CD2X Divider, which divides the output of the PLL based on a
* divisor selected from a set of pre-defined choices.
* - The CD2X Squasher, which further divides the output based on a
* waveform represented as a sequence of bits where each zero
* "squashes out" a clock cycle.
* - And, finally, a fixed divider that divides the output frequency by 2.
*
* As such, the resulting CDCLK frequency can be calculated with the
* following formula:
*
* cdclk = vco / cd2x_div / (sq_len / sq_div) / 2
*
* , where vco is the frequency generated by the PLL; cd2x_div
* represents the CD2X Divider; sq_len and sq_div are the bit length
* and the number of high bits for the CD2X Squasher waveform, respectively;
* and 2 represents the fixed divider.
*
* Note that some older platforms do not contain the CD2X Divider
* and/or CD2X Squasher, in which case we can ignore their respective
* factors in the formula above.
*
* Several methods exist to change the CDCLK frequency, which ones are
* supported depends on the platform:
*
* - Full PLL disable + re-enable with new VCO frequency. Pipes must be inactive.
* - CD2X divider update. Single pipe can be active as the divider update
* can be synchronized with the pipe's start of vblank.
* - Crawl the PLL smoothly to the new VCO frequency. Pipes can be active.
* - Squash waveform update. Pipes can be active.
* - Crawl and squash can also be done back to back. Pipes can be active.
*
* 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 intel_display *display,
struct intel_cdclk_config *cdclk_config);
void (*set_cdclk)(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe);
int (*modeset_calc_cdclk)(struct intel_atomic_state *state);
u8 (*calc_voltage_level)(int cdclk);
};
void intel_cdclk_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
display->funcs.cdclk->get_cdclk(display, cdclk_config);
}
static void intel_cdclk_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
display->funcs.cdclk->set_cdclk(display, cdclk_config, pipe);
}
static int intel_cdclk_modeset_calc_cdclk(struct intel_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
return display->funcs.cdclk->modeset_calc_cdclk(state);
}
static u8 intel_cdclk_calc_voltage_level(struct intel_display *display,
int cdclk)
{
return display->funcs.cdclk->calc_voltage_level(cdclk);
}
static void fixed_133mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 133333;
}
static void fixed_200mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 200000;
}
static void fixed_266mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 266667;
}
static void fixed_333mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 333333;
}
static void fixed_400mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 400000;
}
static void fixed_450mhz_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
cdclk_config->cdclk = 450000;
}
static void i85x_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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 intel_display *display)
{
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,
};
struct drm_i915_private *dev_priv = to_i915(display->drm);
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(display,
IS_PINEVIEW(dev_priv) || IS_MOBILE(dev_priv) ? HPLLVCO_MOBILE : HPLLVCO);
vco = vco_table[tmp & 0x7];
if (vco == 0)
drm_err(display->drm, "Bad HPLL VCO (HPLLVCO=0x%02x)\n",
tmp);
else
drm_dbg_kms(display->drm, "HPLL VCO %u kHz\n", vco);
return vco;
}
static void g33_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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(display);
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(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->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(display);
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(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct pci_dev *pdev = to_pci_dev(display->drm->dev);
unsigned int cdclk_sel;
u16 tmp = 0;
cdclk_config->vco = intel_hpll_vco(display);
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(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
u32 lcpll = intel_de_read(display, LCPLL_CTL);
u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_config->cdclk = 800000;
else if (intel_de_read(display, FUSE_STRAP) & HSW_CDCLK_LIMIT)
cdclk_config->cdclk = 450000;
else if (freq == LCPLL_CLK_FREQ_450)
cdclk_config->cdclk = 450000;
else if (IS_HASWELL_ULT(dev_priv))
cdclk_config->cdclk = 337500;
else
cdclk_config->cdclk = 540000;
}
static int vlv_calc_cdclk(struct intel_display *display, int min_cdclk)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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 intel_display *display, int cdclk)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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 intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
unsigned int credits, default_credits;
if (IS_CHERRYVIEW(dev_priv))
default_credits = PFI_CREDIT(12);
else
default_credits = PFI_CREDIT(8);
if (display->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(display, GCI_CONTROL,
VGA_FAST_MODE_DISABLE | default_credits);
intel_de_write(display, 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(display->drm,
intel_de_read(display, GCI_CONTROL) & PFI_CREDIT_RESEND);
}
static void vlv_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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(display->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(display->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(display);
vlv_program_pfi_credits(display);
intel_display_power_put(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref);
}
static void chv_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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(display->drm,
"timed out waiting for CDclk change\n");
}
vlv_punit_put(dev_priv);
intel_update_cdclk(display);
vlv_program_pfi_credits(display);
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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
u32 lcpll = intel_de_read(display, LCPLL_CTL);
u32 freq = lcpll & LCPLL_CLK_FREQ_MASK;
if (lcpll & LCPLL_CD_SOURCE_FCLK)
cdclk_config->cdclk = 800000;
else if (intel_de_read(display, 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 intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
int cdclk = cdclk_config->cdclk;
int ret;
if (drm_WARN(display->drm,
(intel_de_read(display, 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->uncore, BDW_PCODE_DISPLAY_FREQ_CHANGE_REQ, 0x0);
if (ret) {
drm_err(display->drm,
"failed to inform pcode about cdclk change\n");
return;
}
intel_de_rmw(display, 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(display, LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE, 100))
drm_err(display->drm, "Switching to FCLK failed\n");
intel_de_rmw(display, LCPLL_CTL,
LCPLL_CLK_FREQ_MASK, bdw_cdclk_freq_sel(cdclk));
intel_de_rmw(display, LCPLL_CTL,
LCPLL_CD_SOURCE_FCLK, 0);
if (wait_for_us((intel_de_read(display, LCPLL_CTL) &
LCPLL_CD_SOURCE_FCLK_DONE) == 0, 1))
drm_err(display->drm, "Switching back to LCPLL failed\n");
snb_pcode_write(&dev_priv->uncore, HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_config->voltage_level);
intel_de_write(display, CDCLK_FREQ,
DIV_ROUND_CLOSEST(cdclk, 1000) - 1);
intel_update_cdclk(display);
}
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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
u32 val;
cdclk_config->ref = 24000;
cdclk_config->vco = 0;
val = intel_de_read(display, LCPLL1_CTL);
if ((val & LCPLL_PLL_ENABLE) == 0)
return;
if (drm_WARN_ON(display->drm, (val & LCPLL_PLL_LOCK) == 0))
return;
val = intel_de_read(display, DPLL_CTRL1);
if (drm_WARN_ON(display->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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
u32 cdctl;
skl_dpll0_update(display, cdclk_config);
cdclk_config->cdclk = cdclk_config->bypass = cdclk_config->ref;
if (cdclk_config->vco == 0)
goto out;
cdctl = intel_de_read(display, 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 intel_display *display, int vco)
{
bool changed = display->cdclk.skl_preferred_vco_freq != vco;
display->cdclk.skl_preferred_vco_freq = vco;
if (changed)
intel_update_max_cdclk(display);
}
static u32 skl_dpll0_link_rate(struct intel_display *display, int vco)
{
drm_WARN_ON(display->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 intel_display *display, int vco)
{
intel_de_rmw(display, 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(display, vco));
intel_de_posting_read(display, DPLL_CTRL1);
intel_de_rmw(display, LCPLL1_CTL,
0, LCPLL_PLL_ENABLE);
if (intel_de_wait_for_set(display, LCPLL1_CTL, LCPLL_PLL_LOCK, 5))
drm_err(display->drm, "DPLL0 not locked\n");
display->cdclk.hw.vco = vco;
/* We'll want to keep using the current vco from now on. */
skl_set_preferred_cdclk_vco(display, vco);
}
static void skl_dpll0_disable(struct intel_display *display)
{
intel_de_rmw(display, LCPLL1_CTL,
LCPLL_PLL_ENABLE, 0);
if (intel_de_wait_for_clear(display, LCPLL1_CTL, LCPLL_PLL_LOCK, 1))
drm_err(display->drm, "Couldn't disable DPLL0\n");
display->cdclk.hw.vco = 0;
}
static u32 skl_cdclk_freq_sel(struct intel_display *display,
int cdclk, int vco)
{
switch (cdclk) {
default:
drm_WARN_ON(display->drm,
cdclk != display->cdclk.hw.bypass);
drm_WARN_ON(display->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 intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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(display->drm,
IS_SKYLAKE(dev_priv) && vco == 8640000);
ret = skl_pcode_request(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
SKL_CDCLK_PREPARE_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE, 3);
if (ret) {
drm_err(display->drm,
"Failed to inform PCU about cdclk change (%d)\n", ret);
return;
}
freq_select = skl_cdclk_freq_sel(display, cdclk, vco);
if (display->cdclk.hw.vco != 0 &&
display->cdclk.hw.vco != vco)
skl_dpll0_disable(display);
cdclk_ctl = intel_de_read(display, CDCLK_CTL);
if (display->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(display, CDCLK_CTL, cdclk_ctl);
}
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl |= CDCLK_DIVMUX_CD_OVERRIDE;
intel_de_write(display, CDCLK_CTL, cdclk_ctl);
intel_de_posting_read(display, CDCLK_CTL);
if (display->cdclk.hw.vco != vco)
skl_dpll0_enable(display, vco);
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~(CDCLK_FREQ_SEL_MASK | CDCLK_FREQ_DECIMAL_MASK);
intel_de_write(display, CDCLK_CTL, cdclk_ctl);
cdclk_ctl |= freq_select | skl_cdclk_decimal(cdclk);
intel_de_write(display, CDCLK_CTL, cdclk_ctl);
/* Wa Display #1183: skl,kbl,cfl */
cdclk_ctl &= ~CDCLK_DIVMUX_CD_OVERRIDE;
intel_de_write(display, CDCLK_CTL, cdclk_ctl);
intel_de_posting_read(display, CDCLK_CTL);
/* inform PCU of the change */
snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
cdclk_config->voltage_level);
intel_update_cdclk(display);
}
static void skl_sanitize_cdclk(struct intel_display *display)
{
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(display, SWF_ILK(0x18)) & 0x00FFFFFF) == 0)
goto sanitize;
intel_update_cdclk(display);
intel_cdclk_dump_config(display, &display->cdclk.hw, "Current CDCLK");
/* Is PLL enabled and locked ? */
if (display->cdclk.hw.vco == 0 ||
display->cdclk.hw.cdclk == display->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(display, CDCLK_CTL);
expected = (cdctl & CDCLK_FREQ_SEL_MASK) |
skl_cdclk_decimal(display->cdclk.hw.cdclk);
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
drm_dbg_kms(display->drm, "Sanitizing cdclk programmed by pre-os\n");
/* force cdclk programming */
display->cdclk.hw.cdclk = 0;
/* force full PLL disable + enable */
display->cdclk.hw.vco = ~0;
}
static void skl_cdclk_init_hw(struct intel_display *display)
{
struct intel_cdclk_config cdclk_config;
skl_sanitize_cdclk(display);
if (display->cdclk.hw.cdclk != 0 &&
display->cdclk.hw.vco != 0) {
/*
* Use the current vco as our initial
* guess as to what the preferred vco is.
*/
if (display->cdclk.skl_preferred_vco_freq == 0)
skl_set_preferred_cdclk_vco(display,
display->cdclk.hw.vco);
return;
}
cdclk_config = display->cdclk.hw;
cdclk_config.vco = display->cdclk.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(display, &cdclk_config, INVALID_PIPE);
}
static void skl_cdclk_uninit_hw(struct intel_display *display)
{
struct intel_cdclk_config cdclk_config = display->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(display, &cdclk_config, INVALID_PIPE);
}
struct intel_cdclk_vals {
u32 cdclk;
u16 refclk;
u16 waveform;
u8 ratio;
};
static const struct intel_cdclk_vals bxt_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 144000, .ratio = 60 },
{ .refclk = 19200, .cdclk = 288000, .ratio = 60 },
{ .refclk = 19200, .cdclk = 384000, .ratio = 60 },
{ .refclk = 19200, .cdclk = 576000, .ratio = 60 },
{ .refclk = 19200, .cdclk = 624000, .ratio = 65 },
{}
};
static const struct intel_cdclk_vals glk_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 79200, .ratio = 33 },
{ .refclk = 19200, .cdclk = 158400, .ratio = 33 },
{ .refclk = 19200, .cdclk = 316800, .ratio = 33 },
{}
};
static const struct intel_cdclk_vals icl_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .ratio = 18 },
{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
{ .refclk = 19200, .cdclk = 326400, .ratio = 68 },
{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },
{ .refclk = 24000, .cdclk = 180000, .ratio = 15 },
{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
{ .refclk = 24000, .cdclk = 324000, .ratio = 54 },
{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },
{ .refclk = 38400, .cdclk = 172800, .ratio = 9 },
{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
{ .refclk = 38400, .cdclk = 326400, .ratio = 34 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals rkl_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .ratio = 36 },
{ .refclk = 19200, .cdclk = 192000, .ratio = 40 },
{ .refclk = 19200, .cdclk = 307200, .ratio = 64 },
{ .refclk = 19200, .cdclk = 326400, .ratio = 136 },
{ .refclk = 19200, .cdclk = 556800, .ratio = 116 },
{ .refclk = 19200, .cdclk = 652800, .ratio = 136 },
{ .refclk = 24000, .cdclk = 180000, .ratio = 30 },
{ .refclk = 24000, .cdclk = 192000, .ratio = 32 },
{ .refclk = 24000, .cdclk = 312000, .ratio = 52 },
{ .refclk = 24000, .cdclk = 324000, .ratio = 108 },
{ .refclk = 24000, .cdclk = 552000, .ratio = 92 },
{ .refclk = 24000, .cdclk = 648000, .ratio = 108 },
{ .refclk = 38400, .cdclk = 172800, .ratio = 18 },
{ .refclk = 38400, .cdclk = 192000, .ratio = 20 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 32 },
{ .refclk = 38400, .cdclk = 326400, .ratio = 68 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 58 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 68 },
{}
};
static const struct intel_cdclk_vals adlp_a_step_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },
{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
{ .refclk = 24400, .cdclk = 648000, .ratio = 54 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals adlp_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .ratio = 27 },
{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },
{ .refclk = 24000, .cdclk = 176000, .ratio = 22 },
{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },
{ .refclk = 38400, .cdclk = 179200, .ratio = 14 },
{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals rplu_cdclk_table[] = {
{ .refclk = 19200, .cdclk = 172800, .ratio = 27 },
{ .refclk = 19200, .cdclk = 192000, .ratio = 20 },
{ .refclk = 19200, .cdclk = 307200, .ratio = 32 },
{ .refclk = 19200, .cdclk = 480000, .ratio = 50 },
{ .refclk = 19200, .cdclk = 556800, .ratio = 58 },
{ .refclk = 19200, .cdclk = 652800, .ratio = 68 },
{ .refclk = 24000, .cdclk = 176000, .ratio = 22 },
{ .refclk = 24000, .cdclk = 192000, .ratio = 16 },
{ .refclk = 24000, .cdclk = 312000, .ratio = 26 },
{ .refclk = 24000, .cdclk = 480000, .ratio = 40 },
{ .refclk = 24000, .cdclk = 552000, .ratio = 46 },
{ .refclk = 24000, .cdclk = 648000, .ratio = 54 },
{ .refclk = 38400, .cdclk = 179200, .ratio = 14 },
{ .refclk = 38400, .cdclk = 192000, .ratio = 10 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16 },
{ .refclk = 38400, .cdclk = 480000, .ratio = 25 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34 },
{}
};
static const struct intel_cdclk_vals dg2_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 163200, .ratio = 34, .waveform = 0x8888 },
{ .refclk = 38400, .cdclk = 204000, .ratio = 34, .waveform = 0x9248 },
{ .refclk = 38400, .cdclk = 244800, .ratio = 34, .waveform = 0xa4a4 },
{ .refclk = 38400, .cdclk = 285600, .ratio = 34, .waveform = 0xa54a },
{ .refclk = 38400, .cdclk = 326400, .ratio = 34, .waveform = 0xaaaa },
{ .refclk = 38400, .cdclk = 367200, .ratio = 34, .waveform = 0xad5a },
{ .refclk = 38400, .cdclk = 408000, .ratio = 34, .waveform = 0xb6b6 },
{ .refclk = 38400, .cdclk = 448800, .ratio = 34, .waveform = 0xdbb6 },
{ .refclk = 38400, .cdclk = 489600, .ratio = 34, .waveform = 0xeeee },
{ .refclk = 38400, .cdclk = 530400, .ratio = 34, .waveform = 0xf7de },
{ .refclk = 38400, .cdclk = 571200, .ratio = 34, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 612000, .ratio = 34, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
{}
};
static const struct intel_cdclk_vals mtl_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0x0000 },
{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0x0000 },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0x0000 },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0x0000 },
{}
};
static const struct intel_cdclk_vals xe2lpd_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 153600, .ratio = 16, .waveform = 0xaaaa },
{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
{ .refclk = 38400, .cdclk = 211200, .ratio = 16, .waveform = 0xdbb6 },
{ .refclk = 38400, .cdclk = 230400, .ratio = 16, .waveform = 0xeeee },
{ .refclk = 38400, .cdclk = 249600, .ratio = 16, .waveform = 0xf7de },
{ .refclk = 38400, .cdclk = 268800, .ratio = 16, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 288000, .ratio = 16, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 330000, .ratio = 25, .waveform = 0xdbb6 },
{ .refclk = 38400, .cdclk = 360000, .ratio = 25, .waveform = 0xeeee },
{ .refclk = 38400, .cdclk = 390000, .ratio = 25, .waveform = 0xf7de },
{ .refclk = 38400, .cdclk = 420000, .ratio = 25, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 450000, .ratio = 25, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 487200, .ratio = 29, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 522000, .ratio = 29, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 571200, .ratio = 34, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 612000, .ratio = 34, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
{}
};
/*
* Xe2_HPD always uses the minimal cdclk table from Wa_15015413771
*/
static const struct intel_cdclk_vals xe2hpd_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
{}
};
static const struct intel_cdclk_vals xe3lpd_cdclk_table[] = {
{ .refclk = 38400, .cdclk = 153600, .ratio = 16, .waveform = 0xaaaa },
{ .refclk = 38400, .cdclk = 172800, .ratio = 16, .waveform = 0xad5a },
{ .refclk = 38400, .cdclk = 192000, .ratio = 16, .waveform = 0xb6b6 },
{ .refclk = 38400, .cdclk = 211200, .ratio = 16, .waveform = 0xdbb6 },
{ .refclk = 38400, .cdclk = 230400, .ratio = 16, .waveform = 0xeeee },
{ .refclk = 38400, .cdclk = 249600, .ratio = 16, .waveform = 0xf7de },
{ .refclk = 38400, .cdclk = 268800, .ratio = 16, .waveform = 0xfefe },
{ .refclk = 38400, .cdclk = 288000, .ratio = 16, .waveform = 0xfffe },
{ .refclk = 38400, .cdclk = 307200, .ratio = 16, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 326400, .ratio = 17, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 345600, .ratio = 18, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 364800, .ratio = 19, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 384000, .ratio = 20, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 403200, .ratio = 21, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 422400, .ratio = 22, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 441600, .ratio = 23, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 460800, .ratio = 24, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 480000, .ratio = 25, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 499200, .ratio = 26, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 518400, .ratio = 27, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 537600, .ratio = 28, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 556800, .ratio = 29, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 576000, .ratio = 30, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 595200, .ratio = 31, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 614400, .ratio = 32, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 633600, .ratio = 33, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 652800, .ratio = 34, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 672000, .ratio = 35, .waveform = 0xffff },
{ .refclk = 38400, .cdclk = 691200, .ratio = 36, .waveform = 0xffff },
{}
};
static const int cdclk_squash_len = 16;
static int cdclk_squash_divider(u16 waveform)
{
return hweight16(waveform ?: 0xffff);
}
static int cdclk_divider(int cdclk, int vco, u16 waveform)
{
/* 2 * cd2x divider */
return DIV_ROUND_CLOSEST(vco * cdclk_squash_divider(waveform),
cdclk * cdclk_squash_len);
}
static int bxt_calc_cdclk(struct intel_display *display, int min_cdclk)
{
const struct intel_cdclk_vals *table = display->cdclk.table;
int i;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == display->cdclk.hw.ref &&
table[i].cdclk >= min_cdclk)
return table[i].cdclk;
drm_WARN(display->drm, 1,
"Cannot satisfy minimum cdclk %d with refclk %u\n",
min_cdclk, display->cdclk.hw.ref);
return 0;
}
static int bxt_calc_cdclk_pll_vco(struct intel_display *display, int cdclk)
{
const struct intel_cdclk_vals *table = display->cdclk.table;
int i;
if (cdclk == display->cdclk.hw.bypass)
return 0;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == display->cdclk.hw.ref &&
table[i].cdclk == cdclk)
return display->cdclk.hw.ref * table[i].ratio;
drm_WARN(display->drm, 1, "cdclk %d not valid for refclk %u\n",
cdclk, display->cdclk.hw.ref);
return 0;
}
static u8 bxt_calc_voltage_level(int cdclk)
{
return DIV_ROUND_UP(cdclk, 25000);
}
static u8 calc_voltage_level(int cdclk, int num_voltage_levels,
const int voltage_level_max_cdclk[])
{
int voltage_level;
for (voltage_level = 0; voltage_level < num_voltage_levels; voltage_level++) {
if (cdclk <= voltage_level_max_cdclk[voltage_level])
return voltage_level;
}
MISSING_CASE(cdclk);
return num_voltage_levels - 1;
}
static u8 icl_calc_voltage_level(int cdclk)
{
static const int icl_voltage_level_max_cdclk[] = {
[0] = 312000,
[1] = 556800,
[2] = 652800,
};
return calc_voltage_level(cdclk,
ARRAY_SIZE(icl_voltage_level_max_cdclk),
icl_voltage_level_max_cdclk);
}
static u8 ehl_calc_voltage_level(int cdclk)
{
static const int ehl_voltage_level_max_cdclk[] = {
[0] = 180000,
[1] = 312000,
[2] = 326400,
/*
* Bspec lists the limit as 556.8 MHz, but some JSL
* development boards (at least) boot with 652.8 MHz
*/
[3] = 652800,
};
return calc_voltage_level(cdclk,
ARRAY_SIZE(ehl_voltage_level_max_cdclk),
ehl_voltage_level_max_cdclk);
}
static u8 tgl_calc_voltage_level(int cdclk)
{
static const int tgl_voltage_level_max_cdclk[] = {
[0] = 312000,
[1] = 326400,
[2] = 556800,
[3] = 652800,
};
return calc_voltage_level(cdclk,
ARRAY_SIZE(tgl_voltage_level_max_cdclk),
tgl_voltage_level_max_cdclk);
}
static u8 rplu_calc_voltage_level(int cdclk)
{
static const int rplu_voltage_level_max_cdclk[] = {
[0] = 312000,
[1] = 480000,
[2] = 556800,
[3] = 652800,
};
return calc_voltage_level(cdclk,
ARRAY_SIZE(rplu_voltage_level_max_cdclk),
rplu_voltage_level_max_cdclk);
}
static u8 xe3lpd_calc_voltage_level(int cdclk)
{
/*
* Starting with xe3lpd power controller does not need the voltage
* index when doing the modeset update. This function is best left
* defined but returning 0 to the mask.
*/
return 0;
}
static void icl_readout_refclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
u32 dssm = intel_de_read(display, 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 intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
u32 val, ratio;
if (IS_DG2(dev_priv))
cdclk_config->ref = 38400;
else if (DISPLAY_VER(display) >= 11)
icl_readout_refclk(display, cdclk_config);
else
cdclk_config->ref = 19200;
val = intel_de_read(display, 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(display) >= 11)
ratio = val & ICL_CDCLK_PLL_RATIO_MASK;
else
ratio = intel_de_read(display, BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;
cdclk_config->vco = ratio * cdclk_config->ref;
}
static void bxt_get_cdclk(struct intel_display *display,
struct intel_cdclk_config *cdclk_config)
{
u32 squash_ctl = 0;
u32 divider;
int div;
bxt_de_pll_readout(display, cdclk_config);
if (DISPLAY_VER(display) >= 12)
cdclk_config->bypass = cdclk_config->ref / 2;
else if (DISPLAY_VER(display) >= 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(display, 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_SQUASH(display))
squash_ctl = intel_de_read(display, 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:
if (DISPLAY_VER(display) >= 20)
cdclk_config->joined_mbus = intel_de_read(display, MBUS_CTL) & MBUS_JOIN;
/*
* 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(display, cdclk_config->cdclk);
}
static void bxt_de_pll_disable(struct intel_display *display)
{
intel_de_write(display, BXT_DE_PLL_ENABLE, 0);
/* Timeout 200us */
if (intel_de_wait_for_clear(display,
BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(display->drm, "timeout waiting for DE PLL unlock\n");
display->cdclk.hw.vco = 0;
}
static void bxt_de_pll_enable(struct intel_display *display, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);
intel_de_rmw(display, BXT_DE_PLL_CTL,
BXT_DE_PLL_RATIO_MASK, BXT_DE_PLL_RATIO(ratio));
intel_de_write(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_PLL_ENABLE);
/* Timeout 200us */
if (intel_de_wait_for_set(display,
BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(display->drm, "timeout waiting for DE PLL lock\n");
display->cdclk.hw.vco = vco;
}
static void icl_cdclk_pll_disable(struct intel_display *display)
{
intel_de_rmw(display, BXT_DE_PLL_ENABLE,
BXT_DE_PLL_PLL_ENABLE, 0);
/* Timeout 200us */
if (intel_de_wait_for_clear(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(display->drm, "timeout waiting for CDCLK PLL unlock\n");
display->cdclk.hw.vco = 0;
}
static void icl_cdclk_pll_enable(struct intel_display *display, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);
u32 val;
val = ICL_CDCLK_PLL_RATIO(ratio);
intel_de_write(display, BXT_DE_PLL_ENABLE, val);
val |= BXT_DE_PLL_PLL_ENABLE;
intel_de_write(display, BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (intel_de_wait_for_set(display, BXT_DE_PLL_ENABLE, BXT_DE_PLL_LOCK, 1))
drm_err(display->drm, "timeout waiting for CDCLK PLL lock\n");
display->cdclk.hw.vco = vco;
}
static void adlp_cdclk_pll_crawl(struct intel_display *display, int vco)
{
int ratio = DIV_ROUND_CLOSEST(vco, display->cdclk.hw.ref);
u32 val;
/* Write PLL ratio without disabling */
val = ICL_CDCLK_PLL_RATIO(ratio) | BXT_DE_PLL_PLL_ENABLE;
intel_de_write(display, BXT_DE_PLL_ENABLE, val);
/* Submit freq change request */
val |= BXT_DE_PLL_FREQ_REQ;
intel_de_write(display, BXT_DE_PLL_ENABLE, val);
/* Timeout 200us */
if (intel_de_wait_for_set(display, BXT_DE_PLL_ENABLE,
BXT_DE_PLL_LOCK | BXT_DE_PLL_FREQ_REQ_ACK, 1))
drm_err(display->drm, "timeout waiting for FREQ change request ack\n");
val &= ~BXT_DE_PLL_FREQ_REQ;
intel_de_write(display, BXT_DE_PLL_ENABLE, val);
display->cdclk.hw.vco = vco;
}
static u32 bxt_cdclk_cd2x_pipe(struct intel_display *display, enum pipe pipe)
{
if (DISPLAY_VER(display) >= 12) {
if (pipe == INVALID_PIPE)
return TGL_CDCLK_CD2X_PIPE_NONE;
else
return TGL_CDCLK_CD2X_PIPE(pipe);
} else if (DISPLAY_VER(display) >= 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 intel_display *display,
int cdclk, int vco, u16 waveform)
{
/* cdclk = vco / 2 / div{1,1.5,2,4} */
switch (cdclk_divider(cdclk, vco, waveform)) {
default:
drm_WARN_ON(display->drm,
cdclk != display->cdclk.hw.bypass);
drm_WARN_ON(display->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 u16 cdclk_squash_waveform(struct intel_display *display,
int cdclk)
{
const struct intel_cdclk_vals *table = display->cdclk.table;
int i;
if (cdclk == display->cdclk.hw.bypass)
return 0;
for (i = 0; table[i].refclk; i++)
if (table[i].refclk == display->cdclk.hw.ref &&
table[i].cdclk == cdclk)
return table[i].waveform;
drm_WARN(display->drm, 1, "cdclk %d not valid for refclk %u\n",
cdclk, display->cdclk.hw.ref);
return 0xffff;
}
static void icl_cdclk_pll_update(struct intel_display *display, int vco)
{
if (display->cdclk.hw.vco != 0 &&
display->cdclk.hw.vco != vco)
icl_cdclk_pll_disable(display);
if (display->cdclk.hw.vco != vco)
icl_cdclk_pll_enable(display, vco);
}
static void bxt_cdclk_pll_update(struct intel_display *display, int vco)
{
if (display->cdclk.hw.vco != 0 &&
display->cdclk.hw.vco != vco)
bxt_de_pll_disable(display);
if (display->cdclk.hw.vco != vco)
bxt_de_pll_enable(display, vco);
}
static void dg2_cdclk_squash_program(struct intel_display *display,
u16 waveform)
{
u32 squash_ctl = 0;
if (waveform)
squash_ctl = CDCLK_SQUASH_ENABLE |
CDCLK_SQUASH_WINDOW_SIZE(0xf) | waveform;
intel_de_write(display, CDCLK_SQUASH_CTL, squash_ctl);
}
static bool cdclk_pll_is_unknown(unsigned int vco)
{
/*
* Ensure driver does not take the crawl path for the
* case when the vco is set to ~0 in the
* sanitize path.
*/
return vco == ~0;
}
static bool mdclk_source_is_cdclk_pll(struct intel_display *display)
{
return DISPLAY_VER(display) >= 20;
}
static u32 xe2lpd_mdclk_source_sel(struct intel_display *display)
{
if (mdclk_source_is_cdclk_pll(display))
return MDCLK_SOURCE_SEL_CDCLK_PLL;
return MDCLK_SOURCE_SEL_CD2XCLK;
}
int intel_mdclk_cdclk_ratio(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config)
{
if (mdclk_source_is_cdclk_pll(display))
return DIV_ROUND_UP(cdclk_config->vco, cdclk_config->cdclk);
/* Otherwise, source for MDCLK is CD2XCLK. */
return 2;
}
static void xe2lpd_mdclk_cdclk_ratio_program(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config)
{
struct drm_i915_private *i915 = to_i915(display->drm);
intel_dbuf_mdclk_cdclk_ratio_update(i915,
intel_mdclk_cdclk_ratio(display, cdclk_config),
cdclk_config->joined_mbus);
}
static bool cdclk_compute_crawl_and_squash_midpoint(struct intel_display *display,
const struct intel_cdclk_config *old_cdclk_config,
const struct intel_cdclk_config *new_cdclk_config,
struct intel_cdclk_config *mid_cdclk_config)
{
u16 old_waveform, new_waveform, mid_waveform;
int old_div, new_div, mid_div;
/* Return if PLL is in an unknown state, force a complete disable and re-enable. */
if (cdclk_pll_is_unknown(old_cdclk_config->vco))
return false;
/* Return if both Squash and Crawl are not present */
if (!HAS_CDCLK_CRAWL(display) || !HAS_CDCLK_SQUASH(display))
return false;
old_waveform = cdclk_squash_waveform(display, old_cdclk_config->cdclk);
new_waveform = cdclk_squash_waveform(display, new_cdclk_config->cdclk);
/* Return if Squash only or Crawl only is the desired action */
if (old_cdclk_config->vco == 0 || new_cdclk_config->vco == 0 ||
old_cdclk_config->vco == new_cdclk_config->vco ||
old_waveform == new_waveform)
return false;
old_div = cdclk_divider(old_cdclk_config->cdclk,
old_cdclk_config->vco, old_waveform);
new_div = cdclk_divider(new_cdclk_config->cdclk,
new_cdclk_config->vco, new_waveform);
/*
* Should not happen currently. We might need more midpoint
* transitions if we need to also change the cd2x divider.
*/
if (drm_WARN_ON(display->drm, old_div != new_div))
return false;
*mid_cdclk_config = *new_cdclk_config;
/*
* Populate the mid_cdclk_config accordingly.
* - If moving to a higher cdclk, the desired action is squashing.
* The mid cdclk config should have the new (squash) waveform.
* - If moving to a lower cdclk, the desired action is crawling.
* The mid cdclk config should have the new vco.
*/
if (cdclk_squash_divider(new_waveform) > cdclk_squash_divider(old_waveform)) {
mid_cdclk_config->vco = old_cdclk_config->vco;
mid_div = old_div;
mid_waveform = new_waveform;
} else {
mid_cdclk_config->vco = new_cdclk_config->vco;
mid_div = new_div;
mid_waveform = old_waveform;
}
mid_cdclk_config->cdclk = DIV_ROUND_CLOSEST(cdclk_squash_divider(mid_waveform) *
mid_cdclk_config->vco,
cdclk_squash_len * mid_div);
/* make sure the mid clock came out sane */
drm_WARN_ON(display->drm, mid_cdclk_config->cdclk <
min(old_cdclk_config->cdclk, new_cdclk_config->cdclk));
drm_WARN_ON(display->drm, mid_cdclk_config->cdclk >
display->cdclk.max_cdclk_freq);
drm_WARN_ON(display->drm, cdclk_squash_waveform(display, mid_cdclk_config->cdclk) !=
mid_waveform);
return true;
}
static bool pll_enable_wa_needed(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
return (DISPLAY_VERx100(display) == 2000 ||
DISPLAY_VERx100(display) == 1400 ||
IS_DG2(dev_priv)) &&
display->cdclk.hw.vco > 0;
}
static u32 bxt_cdclk_ctl(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *i915 = to_i915(display->drm);
int cdclk = cdclk_config->cdclk;
int vco = cdclk_config->vco;
u16 waveform;
u32 val;
waveform = cdclk_squash_waveform(display, cdclk);
val = bxt_cdclk_cd2x_div_sel(display, cdclk, vco, waveform) |
bxt_cdclk_cd2x_pipe(display, pipe);
/*
* Disable SSA Precharge when CD clock frequency < 500 MHz,
* enable otherwise.
*/
if ((IS_GEMINILAKE(i915) || IS_BROXTON(i915)) &&
cdclk >= 500000)
val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
if (DISPLAY_VER(display) >= 20)
val |= xe2lpd_mdclk_source_sel(display);
else
val |= skl_cdclk_decimal(cdclk);
return val;
}
static void _bxt_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
int cdclk = cdclk_config->cdclk;
int vco = cdclk_config->vco;
if (HAS_CDCLK_CRAWL(display) && display->cdclk.hw.vco > 0 && vco > 0 &&
!cdclk_pll_is_unknown(display->cdclk.hw.vco)) {
if (display->cdclk.hw.vco != vco)
adlp_cdclk_pll_crawl(display, vco);
} else if (DISPLAY_VER(display) >= 11) {
/* wa_15010685871: dg2, mtl */
if (pll_enable_wa_needed(display))
dg2_cdclk_squash_program(display, 0);
icl_cdclk_pll_update(display, vco);
} else {
bxt_cdclk_pll_update(display, vco);
}
if (HAS_CDCLK_SQUASH(display)) {
u16 waveform = cdclk_squash_waveform(display, cdclk);
dg2_cdclk_squash_program(display, waveform);
}
intel_de_write(display, CDCLK_CTL, bxt_cdclk_ctl(display, cdclk_config, pipe));
if (pipe != INVALID_PIPE)
intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(display, pipe));
}
static void bxt_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
struct intel_cdclk_config mid_cdclk_config;
int cdclk = cdclk_config->cdclk;
int ret = 0;
/*
* Inform power controller of upcoming frequency change.
* Display versions 14 and beyond do not follow the PUnit
* mailbox communication, skip
* this step.
*/
if (DISPLAY_VER(display) >= 14 || IS_DG2(dev_priv))
/* NOOP */;
else if (DISPLAY_VER(display) >= 11)
ret = skl_pcode_request(&dev_priv->uncore, 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->uncore,
HSW_PCODE_DE_WRITE_FREQ_REQ,
0x80000000, 150, 2);
if (ret) {
drm_err(display->drm,
"Failed to inform PCU about cdclk change (err %d, freq %d)\n",
ret, cdclk);
return;
}
if (DISPLAY_VER(display) >= 20 && cdclk < display->cdclk.hw.cdclk)
xe2lpd_mdclk_cdclk_ratio_program(display, cdclk_config);
if (cdclk_compute_crawl_and_squash_midpoint(display, &display->cdclk.hw,
cdclk_config, &mid_cdclk_config)) {
_bxt_set_cdclk(display, &mid_cdclk_config, pipe);
_bxt_set_cdclk(display, cdclk_config, pipe);
} else {
_bxt_set_cdclk(display, cdclk_config, pipe);
}
if (DISPLAY_VER(display) >= 20 && cdclk > display->cdclk.hw.cdclk)
xe2lpd_mdclk_cdclk_ratio_program(display, cdclk_config);
if (DISPLAY_VER(display) >= 14)
/*
* NOOP - No Pcode communication needed for
* Display versions 14 and beyond
*/;
else if (DISPLAY_VER(display) >= 11 && !IS_DG2(dev_priv))
ret = snb_pcode_write(&dev_priv->uncore, SKL_PCODE_CDCLK_CONTROL,
cdclk_config->voltage_level);
if (DISPLAY_VER(display) < 11) {
/*
* 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->uncore,
HSW_PCODE_DE_WRITE_FREQ_REQ,
cdclk_config->voltage_level,
150, 2);
}
if (ret) {
drm_err(display->drm,
"PCode CDCLK freq set failed, (err %d, freq %d)\n",
ret, cdclk);
return;
}
intel_update_cdclk(display);
if (DISPLAY_VER(display) >= 11)
/*
* Can't read out the voltage level :(
* Let's just assume everything is as expected.
*/
display->cdclk.hw.voltage_level = cdclk_config->voltage_level;
}
static void bxt_sanitize_cdclk(struct intel_display *display)
{
u32 cdctl, expected;
int cdclk, vco;
intel_update_cdclk(display);
intel_cdclk_dump_config(display, &display->cdclk.hw, "Current CDCLK");
if (display->cdclk.hw.vco == 0 ||
display->cdclk.hw.cdclk == display->cdclk.hw.bypass)
goto sanitize;
/* Make sure this is a legal cdclk value for the platform */
cdclk = bxt_calc_cdclk(display, display->cdclk.hw.cdclk);
if (cdclk != display->cdclk.hw.cdclk)
goto sanitize;
/* Make sure the VCO is correct for the cdclk */
vco = bxt_calc_cdclk_pll_vco(display, cdclk);
if (vco != display->cdclk.hw.vco)
goto sanitize;
/*
* 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(display, CDCLK_CTL);
expected = bxt_cdclk_ctl(display, &display->cdclk.hw, INVALID_PIPE);
/*
* 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(display, INVALID_PIPE);
expected &= ~bxt_cdclk_cd2x_pipe(display, INVALID_PIPE);
if (cdctl == expected)
/* All well; nothing to sanitize */
return;
sanitize:
drm_dbg_kms(display->drm, "Sanitizing cdclk programmed by pre-os\n");
/* force cdclk programming */
display->cdclk.hw.cdclk = 0;
/* force full PLL disable + enable */
display->cdclk.hw.vco = ~0;
}
static void bxt_cdclk_init_hw(struct intel_display *display)
{
struct intel_cdclk_config cdclk_config;
bxt_sanitize_cdclk(display);
if (display->cdclk.hw.cdclk != 0 &&
display->cdclk.hw.vco != 0)
return;
cdclk_config = display->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(display, 0);
cdclk_config.vco = bxt_calc_cdclk_pll_vco(display, cdclk_config.cdclk);
cdclk_config.voltage_level =
intel_cdclk_calc_voltage_level(display, cdclk_config.cdclk);
bxt_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}
static void bxt_cdclk_uninit_hw(struct intel_display *display)
{
struct intel_cdclk_config cdclk_config = display->cdclk.hw;
cdclk_config.cdclk = cdclk_config.bypass;
cdclk_config.vco = 0;
cdclk_config.voltage_level =
intel_cdclk_calc_voltage_level(display, cdclk_config.cdclk);
bxt_set_cdclk(display, &cdclk_config, INVALID_PIPE);
}
/**
* intel_cdclk_init_hw - Initialize CDCLK hardware
* @display: display instance
*
* Initialize CDCLK. This consists mainly of initializing display->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 intel_display *display)
{
struct drm_i915_private *i915 = to_i915(display->drm);
if (DISPLAY_VER(display) >= 10 || IS_BROXTON(i915))
bxt_cdclk_init_hw(display);
else if (DISPLAY_VER(display) == 9)
skl_cdclk_init_hw(display);
}
/**
* intel_cdclk_uninit_hw - Uninitialize CDCLK hardware
* @display: display instance
*
* Uninitialize CDCLK. This is done only during the display core
* uninitialization sequence.
*/
void intel_cdclk_uninit_hw(struct intel_display *display)
{
struct drm_i915_private *i915 = to_i915(display->drm);
if (DISPLAY_VER(display) >= 10 || IS_BROXTON(i915))
bxt_cdclk_uninit_hw(display);
else if (DISPLAY_VER(display) == 9)
skl_cdclk_uninit_hw(display);
}
static bool intel_cdclk_can_crawl_and_squash(struct intel_display *display,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
u16 old_waveform;
u16 new_waveform;
drm_WARN_ON(display->drm, cdclk_pll_is_unknown(a->vco));
if (a->vco == 0 || b->vco == 0)
return false;
if (!HAS_CDCLK_CRAWL(display) || !HAS_CDCLK_SQUASH(display))
return false;
old_waveform = cdclk_squash_waveform(display, a->cdclk);
new_waveform = cdclk_squash_waveform(display, b->cdclk);
return a->vco != b->vco &&
old_waveform != new_waveform;
}
static bool intel_cdclk_can_crawl(struct intel_display *display,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
int a_div, b_div;
if (!HAS_CDCLK_CRAWL(display))
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 intel_display *display,
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_SQUASH(display))
return false;
return a->cdclk != b->cdclk &&
a->vco != 0 &&
a->vco == b->vco &&
a->ref == b->ref;
}
/**
* intel_cdclk_clock_changed - Check whether the clock changed
* @a: first CDCLK configuration
* @b: second CDCLK configuration
*
* Returns:
* True if CDCLK changed in a way that requires re-programming and
* False otherwise.
*/
bool intel_cdclk_clock_changed(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
* @display: display instance
* @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 intel_display *display,
const struct intel_cdclk_config *a,
const struct intel_cdclk_config *b)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
/* Older hw doesn't have the capability */
if (DISPLAY_VER(display) < 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_SQUASH(display))
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_clock_changed(a, b) ||
a->voltage_level != b->voltage_level;
}
void intel_cdclk_dump_config(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
const char *context)
{
drm_dbg_kms(display->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);
}
static void intel_pcode_notify(struct intel_display *display,
u8 voltage_level,
u8 active_pipe_count,
u16 cdclk,
bool cdclk_update_valid,
bool pipe_count_update_valid)
{
struct drm_i915_private *i915 = to_i915(display->drm);
int ret;
u32 update_mask = 0;
if (!IS_DG2(i915))
return;
update_mask = DISPLAY_TO_PCODE_UPDATE_MASK(cdclk, active_pipe_count, voltage_level);
if (cdclk_update_valid)
update_mask |= DISPLAY_TO_PCODE_CDCLK_VALID;
if (pipe_count_update_valid)
update_mask |= DISPLAY_TO_PCODE_PIPE_COUNT_VALID;
ret = skl_pcode_request(&i915->uncore, SKL_PCODE_CDCLK_CONTROL,
SKL_CDCLK_PREPARE_FOR_CHANGE |
update_mask,
SKL_CDCLK_READY_FOR_CHANGE,
SKL_CDCLK_READY_FOR_CHANGE, 3);
if (ret)
drm_err(display->drm,
"Failed to inform PCU about display config (err %d)\n",
ret);
}
static void intel_set_cdclk(struct intel_display *display,
const struct intel_cdclk_config *cdclk_config,
enum pipe pipe, const char *context)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
struct intel_encoder *encoder;
if (!intel_cdclk_changed(&display->cdclk.hw, cdclk_config))
return;
if (drm_WARN_ON_ONCE(display->drm, !display->funcs.cdclk->set_cdclk))
return;
intel_cdclk_dump_config(display, cdclk_config, context);
for_each_intel_encoder_with_psr(display->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(&display->gmbus.mutex);
for_each_intel_dp(display->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
mutex_lock_nest_lock(&intel_dp->aux.hw_mutex,
&display->gmbus.mutex);
}
intel_cdclk_set_cdclk(display, cdclk_config, pipe);
for_each_intel_dp(display->drm, encoder) {
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
mutex_unlock(&intel_dp->aux.hw_mutex);
}
mutex_unlock(&display->gmbus.mutex);
for_each_intel_encoder_with_psr(display->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(display->drm,
intel_cdclk_changed(&display->cdclk.hw, cdclk_config),
"cdclk state doesn't match!\n")) {
intel_cdclk_dump_config(display, &display->cdclk.hw, "[hw state]");
intel_cdclk_dump_config(display, cdclk_config, "[sw state]");
}
}
static void intel_cdclk_pcode_pre_notify(struct intel_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
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);
unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
bool change_cdclk, update_pipe_count;
if (!intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual) &&
new_cdclk_state->active_pipes ==
old_cdclk_state->active_pipes)
return;
/* According to "Sequence Before Frequency Change", voltage level set to 0x3 */
voltage_level = DISPLAY_TO_PCODE_VOLTAGE_MAX;
change_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
update_pipe_count = hweight8(new_cdclk_state->active_pipes) >
hweight8(old_cdclk_state->active_pipes);
/*
* According to "Sequence Before Frequency Change",
* if CDCLK is increasing, set bits 25:16 to upcoming CDCLK,
* if CDCLK is decreasing or not changing, set bits 25:16 to current CDCLK,
* which basically means we choose the maximum of old and new CDCLK, if we know both
*/
if (change_cdclk)
cdclk = max(new_cdclk_state->actual.cdclk, old_cdclk_state->actual.cdclk);
/*
* According to "Sequence For Pipe Count Change",
* if pipe count is increasing, set bits 25:16 to upcoming pipe count
* (power well is enabled)
* no action if it is decreasing, before the change
*/
if (update_pipe_count)
num_active_pipes = hweight8(new_cdclk_state->active_pipes);
intel_pcode_notify(display, voltage_level, num_active_pipes, cdclk,
change_cdclk, update_pipe_count);
}
static void intel_cdclk_pcode_post_notify(struct intel_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
const struct intel_cdclk_state *new_cdclk_state =
intel_atomic_get_new_cdclk_state(state);
const struct intel_cdclk_state *old_cdclk_state =
intel_atomic_get_old_cdclk_state(state);
unsigned int cdclk = 0; u8 voltage_level, num_active_pipes = 0;
bool update_cdclk, update_pipe_count;
/* According to "Sequence After Frequency Change", set voltage to used level */
voltage_level = new_cdclk_state->actual.voltage_level;
update_cdclk = new_cdclk_state->actual.cdclk != old_cdclk_state->actual.cdclk;
update_pipe_count = hweight8(new_cdclk_state->active_pipes) <
hweight8(old_cdclk_state->active_pipes);
/*
* According to "Sequence After Frequency Change",
* set bits 25:16 to current CDCLK
*/
if (update_cdclk)
cdclk = new_cdclk_state->actual.cdclk;
/*
* According to "Sequence For Pipe Count Change",
* if pipe count is decreasing, set bits 25:16 to current pipe count,
* after the change(power well is disabled)
* no action if it is increasing, after the change
*/
if (update_pipe_count)
num_active_pipes = hweight8(new_cdclk_state->active_pipes);
intel_pcode_notify(display, voltage_level, num_active_pipes, cdclk,
update_cdclk, update_pipe_count);
}
bool intel_cdclk_is_decreasing_later(struct intel_atomic_state *state)
{
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);
return new_cdclk_state && !new_cdclk_state->disable_pipes &&
new_cdclk_state->actual.cdclk < old_cdclk_state->actual.cdclk;
}
/**
* 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 intel_display *display = to_intel_display(state);
struct drm_i915_private *i915 = to_i915(display->drm);
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);
struct intel_cdclk_config cdclk_config;
enum pipe pipe;
if (!intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual))
return;
if (IS_DG2(i915))
intel_cdclk_pcode_pre_notify(state);
if (new_cdclk_state->disable_pipes) {
cdclk_config = new_cdclk_state->actual;
pipe = INVALID_PIPE;
} else {
if (new_cdclk_state->actual.cdclk >= old_cdclk_state->actual.cdclk) {
cdclk_config = new_cdclk_state->actual;
pipe = new_cdclk_state->pipe;
} else {
cdclk_config = old_cdclk_state->actual;
pipe = INVALID_PIPE;
}
cdclk_config.voltage_level = max(new_cdclk_state->actual.voltage_level,
old_cdclk_state->actual.voltage_level);
}
/*
* mbus joining will be changed later by
* intel_dbuf_mbus_{pre,post}_ddb_update()
*/
cdclk_config.joined_mbus = old_cdclk_state->actual.joined_mbus;
drm_WARN_ON(display->drm, !new_cdclk_state->base.changed);
intel_set_cdclk(display, &cdclk_config, pipe,
"Pre changing CDCLK to");
}
/**
* 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 intel_display *display = to_intel_display(state);
struct drm_i915_private *i915 = to_i915(display->drm);
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;
if (!intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual))
return;
if (IS_DG2(i915))
intel_cdclk_pcode_post_notify(state);
if (!new_cdclk_state->disable_pipes &&
new_cdclk_state->actual.cdclk < old_cdclk_state->actual.cdclk)
pipe = new_cdclk_state->pipe;
else
pipe = INVALID_PIPE;
drm_WARN_ON(display->drm, !new_cdclk_state->base.changed);
intel_set_cdclk(display, &new_cdclk_state->actual, pipe,
"Post changing CDCLK to");
}
static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
{
struct intel_display *display = to_intel_display(crtc_state);
struct drm_i915_private *dev_priv = to_i915(display->drm);
int pixel_rate = crtc_state->pixel_rate;
if (DISPLAY_VER(display) >= 10)
return DIV_ROUND_UP(pixel_rate, 2);
else if (DISPLAY_VER(display) == 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 intel_display *display = to_intel_display(crtc);
struct intel_plane *plane;
int min_cdclk = 0;
for_each_intel_plane_on_crtc(display->drm, crtc, plane)
min_cdclk = max(crtc_state->min_cdclk[plane->id], min_cdclk);
return min_cdclk;
}
static int intel_vdsc_min_cdclk(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
struct intel_display *display = to_intel_display(crtc);
int num_vdsc_instances = intel_dsc_get_num_vdsc_instances(crtc_state);
int min_cdclk = 0;
/*
* 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 there 2 VDSC engines, then pixel clock can't be higher than
* VDSC clock(cdclk) * 2 and so on.
*/
min_cdclk = max_t(int, min_cdclk,
DIV_ROUND_UP(crtc_state->pixel_rate, num_vdsc_instances));
if (crtc_state->joiner_pipes) {
int pixel_clock = intel_dp_mode_to_fec_clock(crtc_state->hw.adjusted_mode.clock);
/*
* According to Bigjoiner bw check:
* compressed_bpp <= PPC * CDCLK * Big joiner Interface bits / Pixel clock
*
* We have already computed compressed_bpp, so now compute the min CDCLK that
* is required to support this compressed_bpp.
*
* => CDCLK >= compressed_bpp * Pixel clock / (PPC * Bigjoiner Interface bits)
*
* Since PPC = 2 with bigjoiner
* => CDCLK >= compressed_bpp * Pixel clock / 2 * Bigjoiner Interface bits
*/
int bigjoiner_interface_bits = DISPLAY_VER(display) >= 14 ? 36 : 24;
int min_cdclk_bj =
(fxp_q4_to_int_roundup(crtc_state->dsc.compressed_bpp_x16) *
pixel_clock) / (2 * bigjoiner_interface_bits);
min_cdclk = max(min_cdclk, min_cdclk_bj);
}
return min_cdclk;
}
int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
{
struct intel_display *display = to_intel_display(crtc_state);
struct drm_i915_private *dev_priv = to_i915(display->drm);
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(display) == 10) {
/* Display WA #1145: glk */
min_cdclk = max(316800, min_cdclk);
} else if (DISPLAY_VER(display) == 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(display) >= 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);
if (crtc_state->dsc.compression_enable)
min_cdclk = max(min_cdclk, intel_vdsc_min_cdclk(crtc_state));
return min_cdclk;
}
static int intel_compute_min_cdclk(struct intel_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
struct drm_i915_private *dev_priv = to_i915(display->drm);
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
const struct intel_bw_state *bw_state;
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;
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;
}
bw_state = intel_atomic_get_new_bw_state(state);
if (bw_state) {
min_cdclk = intel_bw_min_cdclk(dev_priv, bw_state);
if (cdclk_state->bw_min_cdclk != min_cdclk) {
int ret;
cdclk_state->bw_min_cdclk = min_cdclk;
ret = intel_atomic_lock_global_state(&cdclk_state->base);
if (ret)
return ret;
}
}
min_cdclk = max(cdclk_state->force_min_cdclk,
cdclk_state->bw_min_cdclk);
for_each_pipe(display, pipe)
min_cdclk = max(cdclk_state->min_cdclk[pipe], min_cdclk);
/*
* Avoid glk_force_audio_cdclk() causing excessive screen
* blinking when multiple pipes are active by making sure
* CDCLK frequency is always high enough for audio. With a
* single active pipe we can always change CDCLK frequency
* by changing the cd2x divider (see glk_cdclk_table[]) and
* thus a full modeset won't be needed then.
*/
if (IS_GEMINILAKE(dev_priv) && cdclk_state->active_pipes &&
!is_power_of_2(cdclk_state->active_pipes))
min_cdclk = max(2 * 96000, min_cdclk);
if (min_cdclk > display->cdclk.max_cdclk_freq) {
drm_dbg_kms(display->drm,
"required cdclk (%d kHz) exceeds max (%d kHz)\n",
min_cdclk, display->cdclk.max_cdclk_freq);
return -EINVAL;
}
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_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
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(display, 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_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
cdclk = vlv_calc_cdclk(display, min_cdclk);
cdclk_state->logical.cdclk = cdclk;
cdclk_state->logical.voltage_level =
vlv_calc_voltage_level(display, cdclk);
if (!cdclk_state->active_pipes) {
cdclk = vlv_calc_cdclk(display, cdclk_state->force_min_cdclk);
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
vlv_calc_voltage_level(display, cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int bdw_modeset_calc_cdclk(struct intel_atomic_state *state)
{
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
int min_cdclk, cdclk;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
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_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
struct intel_crtc *crtc;
struct intel_crtc_state *crtc_state;
int vco, i;
vco = cdclk_state->logical.vco;
if (!vco)
vco = display->cdclk.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_atomic_state *state)
{
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
int min_cdclk, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
vco = skl_dpll0_vco(state);
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_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
struct intel_cdclk_state *cdclk_state =
intel_atomic_get_new_cdclk_state(state);
int min_cdclk, min_voltage_level, cdclk, vco;
min_cdclk = intel_compute_min_cdclk(state);
if (min_cdclk < 0)
return min_cdclk;
min_voltage_level = bxt_compute_min_voltage_level(state);
if (min_voltage_level < 0)
return min_voltage_level;
cdclk = bxt_calc_cdclk(display, min_cdclk);
vco = bxt_calc_cdclk_pll_vco(display, 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(display, cdclk));
if (!cdclk_state->active_pipes) {
cdclk = bxt_calc_cdclk(display, cdclk_state->force_min_cdclk);
vco = bxt_calc_cdclk_pll_vco(display, cdclk);
cdclk_state->actual.vco = vco;
cdclk_state->actual.cdclk = cdclk;
cdclk_state->actual.voltage_level =
intel_cdclk_calc_voltage_level(display, cdclk);
} else {
cdclk_state->actual = cdclk_state->logical;
}
return 0;
}
static int fixed_modeset_calc_cdclk(struct intel_atomic_state *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(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;
cdclk_state->disable_pipes = false;
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 intel_display *display = to_intel_display(state);
struct intel_global_state *cdclk_state;
cdclk_state = intel_atomic_get_global_obj_state(state, &display->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)
{
const struct intel_cdclk_state *old_cdclk_state;
const struct intel_cdclk_state *new_cdclk_state;
struct intel_plane_state __maybe_unused *plane_state;
struct intel_plane *plane;
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;
}
ret = intel_bw_calc_min_cdclk(state, 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;
return 0;
}
int intel_cdclk_state_set_joined_mbus(struct intel_atomic_state *state, bool joined_mbus)
{
struct intel_cdclk_state *cdclk_state;
cdclk_state = intel_atomic_get_cdclk_state(state);
if (IS_ERR(cdclk_state))
return PTR_ERR(cdclk_state);
cdclk_state->actual.joined_mbus = joined_mbus;
cdclk_state->logical.joined_mbus = joined_mbus;
return intel_atomic_lock_global_state(&cdclk_state->base);
}
int intel_cdclk_init(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
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, &display->cdclk.obj,
&cdclk_state->base, &intel_cdclk_funcs);
return 0;
}
static bool intel_cdclk_need_serialize(struct intel_display *display,
const struct intel_cdclk_state *old_cdclk_state,
const struct intel_cdclk_state *new_cdclk_state)
{
struct drm_i915_private *i915 = to_i915(display->drm);
bool power_well_cnt_changed = hweight8(old_cdclk_state->active_pipes) !=
hweight8(new_cdclk_state->active_pipes);
bool cdclk_changed = intel_cdclk_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual);
/*
* We need to poke hw for gen >= 12, because we notify PCode if
* pipe power well count changes.
*/
return cdclk_changed || (IS_DG2(i915) && power_well_cnt_changed);
}
int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
{
struct intel_display *display = to_intel_display(state);
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(state);
if (ret)
return ret;
if (intel_cdclk_need_serialize(display, old_cdclk_state, new_cdclk_state)) {
/*
* 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(display,
&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(display, pipe);
crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
if (IS_ERR(crtc_state))
return PTR_ERR(crtc_state);
if (intel_crtc_needs_modeset(crtc_state))
pipe = INVALID_PIPE;
}
if (intel_cdclk_can_crawl_and_squash(display,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
drm_dbg_kms(display->drm,
"Can change cdclk via crawling and squashing\n");
} else if (intel_cdclk_can_squash(display,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
drm_dbg_kms(display->drm,
"Can change cdclk via squashing\n");
} else if (intel_cdclk_can_crawl(display,
&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
drm_dbg_kms(display->drm,
"Can change cdclk via crawling\n");
} else if (pipe != INVALID_PIPE) {
new_cdclk_state->pipe = pipe;
drm_dbg_kms(display->drm,
"Can change cdclk cd2x divider with pipe %c active\n",
pipe_name(pipe));
} else if (intel_cdclk_clock_changed(&old_cdclk_state->actual,
&new_cdclk_state->actual)) {
/* All pipes must be switched off while we change the cdclk. */
ret = intel_modeset_all_pipes_late(state, "CDCLK change");
if (ret)
return ret;
new_cdclk_state->disable_pipes = true;
drm_dbg_kms(display->drm,
"Modeset required for cdclk change\n");
}
if (intel_mdclk_cdclk_ratio(display, &old_cdclk_state->actual) !=
intel_mdclk_cdclk_ratio(display, &new_cdclk_state->actual)) {
int ratio = intel_mdclk_cdclk_ratio(display, &new_cdclk_state->actual);
ret = intel_dbuf_state_set_mdclk_cdclk_ratio(state, ratio);
if (ret)
return ret;
}
drm_dbg_kms(display->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(display->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 intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
int max_cdclk_freq = display->cdclk.max_cdclk_freq;
if (DISPLAY_VER(display) >= 10)
return 2 * max_cdclk_freq;
else if (DISPLAY_VER(display) == 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(display) < 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
* @display: display instance
*
* 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 intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
if (DISPLAY_VER(display) >= 30) {
display->cdclk.max_cdclk_freq = 691200;
} else if (IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv)) {
if (display->cdclk.hw.ref == 24000)
display->cdclk.max_cdclk_freq = 552000;
else
display->cdclk.max_cdclk_freq = 556800;
} else if (DISPLAY_VER(display) >= 11) {
if (display->cdclk.hw.ref == 24000)
display->cdclk.max_cdclk_freq = 648000;
else
display->cdclk.max_cdclk_freq = 652800;
} else if (IS_GEMINILAKE(dev_priv)) {
display->cdclk.max_cdclk_freq = 316800;
} else if (IS_BROXTON(dev_priv)) {
display->cdclk.max_cdclk_freq = 624000;
} else if (DISPLAY_VER(display) == 9) {
u32 limit = intel_de_read(display, SKL_DFSM) & SKL_DFSM_CDCLK_LIMIT_MASK;
int max_cdclk, vco;
vco = display->cdclk.skl_preferred_vco_freq;
drm_WARN_ON(display->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;
display->cdclk.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(display, FUSE_STRAP) & HSW_CDCLK_LIMIT)
display->cdclk.max_cdclk_freq = 450000;
else if (IS_BROADWELL_ULX(dev_priv))
display->cdclk.max_cdclk_freq = 450000;
else if (IS_BROADWELL_ULT(dev_priv))
display->cdclk.max_cdclk_freq = 540000;
else
display->cdclk.max_cdclk_freq = 675000;
} else if (IS_CHERRYVIEW(dev_priv)) {
display->cdclk.max_cdclk_freq = 320000;
} else if (IS_VALLEYVIEW(dev_priv)) {
display->cdclk.max_cdclk_freq = 400000;
} else {
/* otherwise assume cdclk is fixed */
display->cdclk.max_cdclk_freq = display->cdclk.hw.cdclk;
}
display->cdclk.max_dotclk_freq = intel_compute_max_dotclk(display);
drm_dbg(display->drm, "Max CD clock rate: %d kHz\n",
display->cdclk.max_cdclk_freq);
drm_dbg(display->drm, "Max dotclock rate: %d kHz\n",
display->cdclk.max_dotclk_freq);
}
/**
* intel_update_cdclk - Determine the current CDCLK frequency
* @display: display instance
*
* Determine the current CDCLK frequency.
*/
void intel_update_cdclk(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
intel_cdclk_get_cdclk(display, &display->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(display, GMBUSFREQ_VLV,
DIV_ROUND_UP(display->cdclk.hw.cdclk, 1000));
}
static int dg1_rawclk(struct intel_display *display)
{
/*
* DG1 always uses a 38.4 MHz rawclk. The bspec tells us
* "Program Numerator=2, Denominator=4, Divider=37 decimal."
*/
intel_de_write(display, PCH_RAWCLK_FREQ,
CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));
return 38400;
}
static int cnp_rawclk(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
int divider, fraction;
u32 rawclk;
if (intel_de_read(display, 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(display, PCH_RAWCLK_FREQ, rawclk);
return divider + fraction;
}
static int pch_rawclk(struct intel_display *display)
{
return (intel_de_read(display, PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK) * 1000;
}
static int vlv_hrawclk(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
/* 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 intel_display *display)
{
struct drm_i915_private *i915 = to_i915(display->drm);
/* hrawclock is 1/4 the FSB frequency */
return DIV_ROUND_CLOSEST(i9xx_fsb_freq(i915), 4);
}
/**
* intel_read_rawclk - Determine the current RAWCLK frequency
* @display: display instance
*
* Determine the current RAWCLK frequency. RAWCLK is a fixed
* frequency clock so this needs to done only once.
*/
u32 intel_read_rawclk(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
u32 freq;
if (INTEL_PCH_TYPE(dev_priv) >= PCH_MTL)
/*
* MTL always uses a 38.4 MHz rawclk. The bspec tells us
* "RAWCLK_FREQ defaults to the values for 38.4 and does
* not need to be programmed."
*/
freq = 38400;
else if (INTEL_PCH_TYPE(dev_priv) >= PCH_DG1)
freq = dg1_rawclk(display);
else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP)
freq = cnp_rawclk(display);
else if (HAS_PCH_SPLIT(dev_priv))
freq = pch_rawclk(display);
else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
freq = vlv_hrawclk(display);
else if (DISPLAY_VER(display) >= 3)
freq = i9xx_hrawclk(display);
else
/* no rawclk on other platforms, or no need to know it */
return 0;
return freq;
}
static int i915_cdclk_info_show(struct seq_file *m, void *unused)
{
struct intel_display *display = m->private;
seq_printf(m, "Current CD clock frequency: %d kHz\n", display->cdclk.hw.cdclk);
seq_printf(m, "Max CD clock frequency: %d kHz\n", display->cdclk.max_cdclk_freq);
seq_printf(m, "Max pixel clock frequency: %d kHz\n", display->cdclk.max_dotclk_freq);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(i915_cdclk_info);
void intel_cdclk_debugfs_register(struct intel_display *display)
{
struct drm_minor *minor = display->drm->primary;
debugfs_create_file("i915_cdclk_info", 0444, minor->debugfs_root,
display, &i915_cdclk_info_fops);
}
static const struct intel_cdclk_funcs xe3lpd_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = xe3lpd_calc_voltage_level,
};
static const struct intel_cdclk_funcs rplu_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_cdclk,
.modeset_calc_cdclk = bxt_modeset_calc_cdclk,
.calc_voltage_level = rplu_calc_voltage_level,
};
static const struct intel_cdclk_funcs tgl_cdclk_funcs = {
.get_cdclk = bxt_get_cdclk,
.set_cdclk = bxt_set_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,
.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,
.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,
.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,
.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,
.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,
.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,
.modeset_calc_cdclk = vlv_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs hsw_cdclk_funcs = {
.get_cdclk = hsw_get_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,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs ilk_cdclk_funcs = {
.get_cdclk = fixed_450mhz_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs gm45_cdclk_funcs = {
.get_cdclk = gm45_get_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,
.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,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs g33_cdclk_funcs = {
.get_cdclk = g33_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i945gm_cdclk_funcs = {
.get_cdclk = i945gm_get_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,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i915g_cdclk_funcs = {
.get_cdclk = fixed_333mhz_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i865g_cdclk_funcs = {
.get_cdclk = fixed_266mhz_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i85x_cdclk_funcs = {
.get_cdclk = i85x_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i845g_cdclk_funcs = {
.get_cdclk = fixed_200mhz_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
static const struct intel_cdclk_funcs i830_cdclk_funcs = {
.get_cdclk = fixed_133mhz_get_cdclk,
.modeset_calc_cdclk = fixed_modeset_calc_cdclk,
};
/**
* intel_init_cdclk_hooks - Initialize CDCLK related modesetting hooks
* @display: display instance
*/
void intel_init_cdclk_hooks(struct intel_display *display)
{
struct drm_i915_private *dev_priv = to_i915(display->drm);
if (DISPLAY_VER(display) >= 30) {
display->funcs.cdclk = &xe3lpd_cdclk_funcs;
display->cdclk.table = xe3lpd_cdclk_table;
} else if (DISPLAY_VER(display) >= 20) {
display->funcs.cdclk = &rplu_cdclk_funcs;
display->cdclk.table = xe2lpd_cdclk_table;
} else if (DISPLAY_VERx100(display) >= 1401) {
display->funcs.cdclk = &rplu_cdclk_funcs;
display->cdclk.table = xe2hpd_cdclk_table;
} else if (DISPLAY_VER(display) >= 14) {
display->funcs.cdclk = &rplu_cdclk_funcs;
display->cdclk.table = mtl_cdclk_table;
} else if (IS_DG2(dev_priv)) {
display->funcs.cdclk = &tgl_cdclk_funcs;
display->cdclk.table = dg2_cdclk_table;
} else if (IS_ALDERLAKE_P(dev_priv)) {
/* Wa_22011320316:adl-p[a0] */
if (IS_ALDERLAKE_P(dev_priv) && IS_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B0)) {
display->cdclk.table = adlp_a_step_cdclk_table;
display->funcs.cdclk = &tgl_cdclk_funcs;
} else if (IS_RAPTORLAKE_U(dev_priv)) {
display->cdclk.table = rplu_cdclk_table;
display->funcs.cdclk = &rplu_cdclk_funcs;
} else {
display->cdclk.table = adlp_cdclk_table;
display->funcs.cdclk = &tgl_cdclk_funcs;
}
} else if (IS_ROCKETLAKE(dev_priv)) {
display->funcs.cdclk = &tgl_cdclk_funcs;
display->cdclk.table = rkl_cdclk_table;
} else if (DISPLAY_VER(display) >= 12) {
display->funcs.cdclk = &tgl_cdclk_funcs;
display->cdclk.table = icl_cdclk_table;
} else if (IS_JASPERLAKE(dev_priv) || IS_ELKHARTLAKE(dev_priv)) {
display->funcs.cdclk = &ehl_cdclk_funcs;
display->cdclk.table = icl_cdclk_table;
} else if (DISPLAY_VER(display) >= 11) {
display->funcs.cdclk = &icl_cdclk_funcs;
display->cdclk.table = icl_cdclk_table;
} else if (IS_GEMINILAKE(dev_priv) || IS_BROXTON(dev_priv)) {
display->funcs.cdclk = &bxt_cdclk_funcs;
if (IS_GEMINILAKE(dev_priv))
display->cdclk.table = glk_cdclk_table;
else
display->cdclk.table = bxt_cdclk_table;
} else if (DISPLAY_VER(display) == 9) {
display->funcs.cdclk = &skl_cdclk_funcs;
} else if (IS_BROADWELL(dev_priv)) {
display->funcs.cdclk = &bdw_cdclk_funcs;
} else if (IS_HASWELL(dev_priv)) {
display->funcs.cdclk = &hsw_cdclk_funcs;
} else if (IS_CHERRYVIEW(dev_priv)) {
display->funcs.cdclk = &chv_cdclk_funcs;
} else if (IS_VALLEYVIEW(dev_priv)) {
display->funcs.cdclk = &vlv_cdclk_funcs;
} else if (IS_SANDYBRIDGE(dev_priv) || IS_IVYBRIDGE(dev_priv)) {
display->funcs.cdclk = &fixed_400mhz_cdclk_funcs;
} else if (IS_IRONLAKE(dev_priv)) {
display->funcs.cdclk = &ilk_cdclk_funcs;
} else if (IS_GM45(dev_priv)) {
display->funcs.cdclk = &gm45_cdclk_funcs;
} else if (IS_G45(dev_priv)) {
display->funcs.cdclk = &g33_cdclk_funcs;
} else if (IS_I965GM(dev_priv)) {
display->funcs.cdclk = &i965gm_cdclk_funcs;
} else if (IS_I965G(dev_priv)) {
display->funcs.cdclk = &fixed_400mhz_cdclk_funcs;
} else if (IS_PINEVIEW(dev_priv)) {
display->funcs.cdclk = &pnv_cdclk_funcs;
} else if (IS_G33(dev_priv)) {
display->funcs.cdclk = &g33_cdclk_funcs;
} else if (IS_I945GM(dev_priv)) {
display->funcs.cdclk = &i945gm_cdclk_funcs;
} else if (IS_I945G(dev_priv)) {
display->funcs.cdclk = &fixed_400mhz_cdclk_funcs;
} else if (IS_I915GM(dev_priv)) {
display->funcs.cdclk = &i915gm_cdclk_funcs;
} else if (IS_I915G(dev_priv)) {
display->funcs.cdclk = &i915g_cdclk_funcs;
} else if (IS_I865G(dev_priv)) {
display->funcs.cdclk = &i865g_cdclk_funcs;
} else if (IS_I85X(dev_priv)) {
display->funcs.cdclk = &i85x_cdclk_funcs;
} else if (IS_I845G(dev_priv)) {
display->funcs.cdclk = &i845g_cdclk_funcs;
} else if (IS_I830(dev_priv)) {
display->funcs.cdclk = &i830_cdclk_funcs;
}
if (drm_WARN(display->drm, !display->funcs.cdclk,
"Unknown platform. Assuming i830\n"))
display->funcs.cdclk = &i830_cdclk_funcs;
}
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