A new CDCLK step of 480MHz has been added on SKUs that has a RPL-U device id. This is done to support 120Hz displays with more efficiency.
RPL-U device ids are currently added within the RPL-P sub platform. It seems to be an overkill to add a separate sub platform just to support this change. Therefore, quirks are a good way to achieve the same. BSpec: 55409 Signed-off-by: Chaitanya Kumar Borah <chaitanya.kumar.bo...@intel.com> --- drivers/gpu/drm/i915/display/intel_quirks.c | 14 ++++++++++++++ drivers/gpu/drm/i915/display/intel_quirks.h | 1 + 2 files changed, 15 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c b/drivers/gpu/drm/i915/display/intel_quirks.c index 6e48d3bcdfec..0a30499835b3 100644 --- a/drivers/gpu/drm/i915/display/intel_quirks.c +++ b/drivers/gpu/drm/i915/display/intel_quirks.c @@ -65,6 +65,16 @@ static void quirk_no_pps_backlight_power_hook(struct drm_i915_private *i915) drm_info(&i915->drm, "Applying no pps backlight power quirk\n"); } +/* + * A new step of 480MHz has been added on SKUs that have a RPL-U device id. + * This particular step is to better support 120Hz panels. + */ +static void quirk_480mhz_cdclk_step_hook(struct drm_i915_private *i915) +{ + intel_set_quirk(i915, QUIRK_480MHZ_CDCLK_STEP); + drm_info(&i915->drm, "Applying 480MHz CDCLK step quirk\n"); +} + struct intel_quirk { int device; int subsystem_vendor; @@ -199,6 +209,10 @@ static struct intel_quirk intel_quirks[] = { /* ECS Liva Q2 */ { 0x3185, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time }, { 0x3184, 0x1019, 0xa94d, quirk_increase_ddi_disabled_time }, + /* RPL-U */ + { 0xA7A1, PCI_ANY_ID, PCI_ANY_ID, quirk_480mhz_cdclk_step_hook }, + { 0xA721, PCI_ANY_ID, PCI_ANY_ID, quirk_480mhz_cdclk_step_hook }, + { 0xA7A9, PCI_ANY_ID, PCI_ANY_ID, quirk_480mhz_cdclk_step_hook }, }; void intel_init_quirks(struct drm_i915_private *i915) diff --git a/drivers/gpu/drm/i915/display/intel_quirks.h b/drivers/gpu/drm/i915/display/intel_quirks.h index 10a4d163149f..71e05684f5f4 100644 --- a/drivers/gpu/drm/i915/display/intel_quirks.h +++ b/drivers/gpu/drm/i915/display/intel_quirks.h @@ -17,6 +17,7 @@ enum intel_quirk_id { QUIRK_INVERT_BRIGHTNESS, QUIRK_LVDS_SSC_DISABLE, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK, + QUIRK_480MHZ_CDCLK_STEP, }; void intel_init_quirks(struct drm_i915_private *i915); -- 2.25.1