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| author |   Krunoslav Kovac <Krunoslav.Kovac@amd.com> | 2019-08-09 17:16:18 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2019-09-13 17:54:53 -0500 |
| commit | e6d14df74064fc65c6367d4c717e016c9d99be59 (patch) | |
| tree | 6c3bde4fb9e057013a82a8fe75ae68b7c83aaf46 /drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c | |
| parent | drm/amd/display: refine i2c over aux (diff) | |
| download | linux-dev-e6d14df74064fc65c6367d4c717e016c9d99be59.tar.xz linux-dev-e6d14df74064fc65c6367d4c717e016c9d99be59.zip | |
drm/amd/display: Subsample mode suboptimal for YCbCr4:2:2
[Why&How]
Driver defaults to 1-tap subsample mode for 4:2:2.
DCE11.2 added 3-tap. The policy is:
DCE8-DCE11 - change to 2-tap, it's better than 1-tap.
DCE11.2+ - use 3-tap
Note that 4:2:0 was added in DCE11.2 and already uses 3-tap always.
Note 2 is that DCE not covered on Linux, only DCN+
Signed-off-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c index e9ebbbe256b4..02c8a3e0b533 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c @@ -168,7 +168,10 @@ static void opp1_set_pixel_encoding( REG_UPDATE(FMT_CONTROL, FMT_PIXEL_ENCODING, 0); break; case PIXEL_ENCODING_YCBCR422: - REG_UPDATE(FMT_CONTROL, FMT_PIXEL_ENCODING, 1); + REG_UPDATE_3(FMT_CONTROL, + FMT_PIXEL_ENCODING, 1, + FMT_SUBSAMPLING_MODE, 2, + FMT_CBCR_BIT_REDUCTION_BYPASS, 0); break; case PIXEL_ENCODING_YCBCR420: REG_UPDATE(FMT_CONTROL, FMT_PIXEL_ENCODING, 2); |