drm/amd/display: Subsample mode suboptimal for YCbCr4:2:2

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[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>

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Krunoslav Kovac 2019-08-09 17:16:18 -04:00 • committed by Alex Deucher

parent 4fd99f67f3

commit e6d14df740

2 changed files with 6 additions and 1 deletions

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5

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.c

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2

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_opp.h

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