drm/amd/display: Update TTU properly (a18463ef) · Commits · 戴 / test

[Why] We need to update TTU properly if DRAMClockChangeWatermark changes. If TTU < DRAMClockChangeWatermark, we pstate won't be allowed and we will hang in some PSR cases. [How] Update TTU if DramClockChangeWatermark value increases (only if TTU was dependent on the watermark value on the DRAMClockChangeWatermark value in the first place). Signed-off-by:

Alvin Lee <alvin.lee2@amd.com> Reviewed-by:

Jun Lei <Jun.Lei@amd.com> Acked-by:

Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Acked-by:

Harry Wentland <harry.wentland@amd.com> Signed-off-by:

Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -2614,6 +2614,14 @@ static void dml20v2_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndP

		if (mode_lib->vba.DRAMClockChangeSupportsVActive &&
		mode_lib->vba.MinActiveDRAMClockChangeMargin > 60) {

		for (k = 0; k < mode_lib->vba.NumberOfActivePlanes; ++k) {
		if (mode_lib->vba.PrefetchMode[mode_lib->vba.VoltageLevel][mode_lib->vba.maxMpcComb] == 0) {
		if (mode_lib->vba.DRAMClockChangeWatermark >
		dml_max(mode_lib->vba.StutterEnterPlusExitWatermark, mode_lib->vba.UrgentWatermark))
		mode_lib->vba.MinTTUVBlank[k] += 25;
		}
		}
		mode_lib->vba.DRAMClockChangeWatermark += 25;
		mode_lib->vba.DRAMClockChangeSupport[0][0] = dm_dram_clock_change_vactive;
		} else if (mode_lib->vba.DummyPStateCheck &&

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