drm/amd/display: fix YCbCr420 blank color

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[ Upstream commit 12750d1647 ]

[Why]
YCbCr420 packing format uses two chanels for luma, and 1
channel for both chroma component. Our previous implementation
did not account for this and results in every other pixel having
very high luma value, showing greyish color instead of black.

YCbCr444 = <Y1, Cb1, Cr1>; <Y2, Cb2, Cr2> .....
YCbCr420 = <Y1, Y2,  Cb1>; <Y3, Y4,  Cr1> .....

[How]
Program the second channel with the black color value for luma
as well.

Signed-off-by: Eric Yang <Eric.Yang2@amd.com>
Reviewed-by: Hugo Hu <Hugo.Hu@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>

...

This commit is contained in:

Eric Yang 2018-11-22 02:07:06 -05:00 • committed by Greg Kroah-Hartman

parent 815e4fe3fd

commit 1509f994e5

2 changed files with 19 additions and 1 deletions

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11

drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c

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9

drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c

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