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drm/amd/display: Increase minimum clock for TMDS 420 with pipe splitting

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[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>
This commit is contained in:
Relja Vojvodic
2025-08-14 11:33:22 -04:00
committed by Alex Deucher
parent 5eeb16ca72
commit 002a612023
1 changed files with 19 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c
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@@ -1238,18 +1238,27 @@ 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(
@@ -4122,11 +4131,12 @@ static noinline_for_stack 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__
DML_LOG_VERBOSE("DML::%s: ODMUse = %d\n", __func__, ODMUse);
DML_LOG_VERBOSE("DML::%s: Output = %d\n", __func__, Output);