On Thu, Jan 7, 2021 at 4:23 PM Rodrigo Siqueira
<rodrigo.sique...@amd.com> wrote:
>
> The patch
>
> commit a861736dae64 ("drm/amd/display: Fixed Intermittent blue screen on OLED
> panel")
>
> causes power regression for many users. It seems that this change causes
> the MCLK to get forced high; this creates a regression for many users
> since their devices were not able to drop to a low state after this
> change. For this reason, this reverts commit
> a861736dae644a0d7abbca0c638ae6aad28feeb8.
>
> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1407
> Cc: Aurabindo Pillai <aurabindo.pil...@amd.com>
> Cc: Alex Deucher <alexander.deuc...@amd.com>
> Cc: Harry Wentland <harry.wentl...@amd.com>
> Cc: Naveed Ashfaq <naveed.ash...@amd.com>
> Cc: Hersen Wu <hersenxs...@amd.com>
> Cc: Roman Li <roman...@amd.com>
> Signed-off-by: Rodrigo Siqueira <rodrigo.sique...@amd.com>
Acked-by: Alex Deucher <alexander.deuc...@amd.com>
> ---
> .../amd/display/dc/dml/dcn20/display_mode_vba_20v2.c | 11 ++++++-----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c
> b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c
> index 860e72a51534..80170f9721ce 100644
> --- a/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c
> +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn20/display_mode_vba_20v2.c
> @@ -2635,14 +2635,15 @@ static void
> dml20v2_DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndP
> }
>
> if (mode_lib->vba.DRAMClockChangeSupportsVActive &&
> - mode_lib->vba.MinActiveDRAMClockChangeMargin > 60 &&
> -
> mode_lib->vba.PrefetchMode[mode_lib->vba.VoltageLevel][mode_lib->vba.maxMpcComb]
> == 0) {
> + mode_lib->vba.MinActiveDRAMClockChangeMargin > 60) {
> mode_lib->vba.DRAMClockChangeWatermark += 25;
>
> for (k = 0; k < mode_lib->vba.NumberOfActivePlanes; ++k) {
> - if (mode_lib->vba.DRAMClockChangeWatermark >
> - dml_max(mode_lib->vba.StutterEnterPlusExitWatermark,
> mode_lib->vba.UrgentWatermark))
> - mode_lib->vba.MinTTUVBlank[k] += 25;
> + 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.DRAMClockChangeSupport[0][0] =
> dm_dram_clock_change_vactive;
> --
> 2.25.1
>
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