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drm/amd/display: Update TTU properly

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[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>
This commit is contained in:
Alvin Lee 2020-02-13 09:58:36 -05:00 committed by Alex Deucher
parent 41ef3dcd86
commit a18463eff7
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c
View file

@ -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 &&