6.12-stable review patch. If anyone has any objections, please let me know.
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From: Relja Vojvodic rvojvodi@amd.com
[ Upstream commit 002a612023c8b105bd3829d81862dee04368d6de ]
[Why] -Pipe splitting allows for clocks to be reduced, but when using TMDS 420, reduced clocks lead to missed clocks cycles on clock resyncing
[How] -Impose a minimum clock when using TMDS 420
Reviewed-by: Chris Park chris.park@amd.com Signed-off-by: Relja Vojvodic rvojvodi@amd.com Signed-off-by: Alex Hung alex.hung@amd.com Tested-by: Dan Wheeler daniel.wheeler@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org --- .../src/dml2_core/dml2_core_dcn4_calcs.c | 28 +++++++++++++------ 1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c index 157903115f3b4..54969ba7e2b7e 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c @@ -1262,18 +1262,27 @@ static void CalculateDETBufferSize(
static double CalculateRequiredDispclk( enum dml2_odm_mode ODMMode, - double PixelClock) + double PixelClock, + bool isTMDS420) { + double DispClk;
if (ODMMode == dml2_odm_mode_combine_4to1) { - return PixelClock / 4.0; + DispClk = PixelClock / 4.0; } else if (ODMMode == dml2_odm_mode_combine_3to1) { - return PixelClock / 3.0; + DispClk = PixelClock / 3.0; } else if (ODMMode == dml2_odm_mode_combine_2to1) { - return PixelClock / 2.0; + DispClk = PixelClock / 2.0; } else { - return PixelClock; + DispClk = PixelClock; + } + + if (isTMDS420) { + double TMDS420MinPixClock = PixelClock / 2.0; + DispClk = math_max2(DispClk, TMDS420MinPixClock); } + + return DispClk; }
static double TruncToValidBPP( @@ -4088,11 +4097,12 @@ static void CalculateODMMode( bool success; bool UseDSC = DSCEnable && (NumberOfDSCSlices > 0); enum dml2_odm_mode DecidedODMMode; + bool isTMDS420 = (OutFormat == dml2_420 && Output == dml2_hdmi);
- SurfaceRequiredDISPCLKWithoutODMCombine = CalculateRequiredDispclk(dml2_odm_mode_bypass, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineTwoToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_2to1, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineThreeToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_3to1, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineFourToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_4to1, PixelClock); + SurfaceRequiredDISPCLKWithoutODMCombine = CalculateRequiredDispclk(dml2_odm_mode_bypass, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineTwoToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_2to1, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineThreeToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_3to1, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineFourToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_4to1, PixelClock, isTMDS420); #ifdef __DML_VBA_DEBUG__ dml2_printf("DML::%s: ODMUse = %d\n", __func__, ODMUse); dml2_printf("DML::%s: Output = %d\n", __func__, Output);