drm/amd/display: add 50us buffer as WA for pstate switch in active

Signed-off-by: Jun Lei <Jun.Lei@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
index 649883777f62a6ff9e08c7154ea8204138f05afa..6c6c486b774a4ea8d043ba8cae61a4ac6a36cbd9 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c
@@ -2577,7 +2577,8 @@ static void dml20_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPer
                        mode_lib->vba.MinActiveDRAMClockChangeMargin
                                        + mode_lib->vba.DRAMClockChangeLatency;
 
-       if (mode_lib->vba.MinActiveDRAMClockChangeMargin > 0) {
+       if (mode_lib->vba.MinActiveDRAMClockChangeMargin > 50) {
+               mode_lib->vba.DRAMClockChangeWatermark += 25;
                mode_lib->vba.DRAMClockChangeSupport[0][0] = dm_dram_clock_change_vactive;
        } else {
                if (mode_lib->vba.SynchronizedVBlank || mode_lib->vba.NumberOfActivePlanes == 1) {