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    Subject[PATCH 5.3 168/193] drm/amd/display: add 50us buffer as WA for pstate switch in active
    Date
    From: Jun Lei <Jun.Lei@amd.com>

    [ Upstream commit 7c37d399c2b84d4b79de4d512a38373f1d71ab90 ]

    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>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    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 649883777f62a..6c6c486b774a4 100644
    --- 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) {
    --
    2.20.1


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