6.7-stable review patch. If anyone has any objections, please let me know.
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From: Ville Syrjälä ville.syrjala@linux.intel.com
commit f7d3b9277ff7eb8e84e6f8554d1c2dd78278a572 upstream.
Looks like TRANS_CHICKEN bit 31 means something totally different depending on the platform: TGL: generate VRR "safe window" for DSB ADL/DG2: make TRANS_SET_CONTEXT_LATENCY effective with VRR
So far we've only set this on ADL/DG2, but when using DSB+VRR we also need to set it on TGL.
And a quick test on MTL says it doesn't need this bit for either of those purposes, even though it's still documented as valid in bspec.
Cc: stable@vger.kernel.org Fixes: 34d8311f4a1c ("drm/i915/dsb: Re-instate DSB for LUT updates") Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9927 Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20240306040806.21697-2-ville.s... Reviewed-by: Animesh Manna animesh.manna@intel.com (cherry picked from commit 810e4519a1b34b5a0ff0eab32e5b184f533c5ee9) Signed-off-by: Rodrigo Vivi rodrigo.vivi@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_vrr.c | 7 ++++--- drivers/gpu/drm/i915/i915_reg.h | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/gpu/drm/i915/display/intel_vrr.c +++ b/drivers/gpu/drm/i915/display/intel_vrr.c @@ -187,10 +187,11 @@ void intel_vrr_set_transcoder_timings(co enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
/* - * TRANS_SET_CONTEXT_LATENCY with VRR enabled - * requires this chicken bit on ADL/DG2. + * This bit seems to have two meanings depending on the platform: + * TGL: generate VRR "safe window" for DSB vblank waits + * ADL/DG2: make TRANS_SET_CONTEXT_LATENCY effective with VRR */ - if (DISPLAY_VER(dev_priv) == 13) + if (IS_DISPLAY_VER(dev_priv, 12, 13)) intel_de_rmw(dev_priv, CHICKEN_TRANS(cpu_transcoder), 0, PIPE_VBLANK_WITH_DELAY);
--- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -4599,7 +4599,7 @@ #define MTL_CHICKEN_TRANS(trans) _MMIO_TRANS((trans), \ _MTL_CHICKEN_TRANS_A, \ _MTL_CHICKEN_TRANS_B) -#define PIPE_VBLANK_WITH_DELAY REG_BIT(31) /* ADL/DG2 */ +#define PIPE_VBLANK_WITH_DELAY REG_BIT(31) /* tgl+ */ #define SKL_UNMASK_VBL_TO_PIPE_IN_SRD REG_BIT(30) /* skl+ */ #define HSW_FRAME_START_DELAY_MASK REG_GENMASK(28, 27) #define HSW_FRAME_START_DELAY(x) REG_FIELD_PREP(HSW_FRAME_START_DELAY_MASK, x)