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drm/amd/display: fix issue where 252-255 values are clipped

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[ Upstream commit 1cbcfc9751 ]

[Why]
When endpoint is at the boundary of a region, such as at 2^0=1
we find that the last segment has a sharp slope and some points
are clipped at the top.

[How]
If end point is 1, which is exactly at the 2^0 region boundary, we
need to program an additional region beyond this point.

Signed-off-by: Anthony Koo <Anthony.Koo@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>
This commit is contained in:
Anthony Koo
2019-07-12 10:52:54 -04:00
committed by Greg Kroah-Hartman
parent efb0e1e3d0
commit 24ba84ec00
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_cm_common.c
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@@ -292,9 +292,10 @@ bool cm_helper_translate_curve_to_hw_format(
seg_distr[7] = 4;
seg_distr[8] = 4;
seg_distr[9] = 4;
seg_distr[10] = 1;
region_start = -10;
region_end = 0;
region_end = 1;
}
for (i = region_end - region_start; i < MAX_REGIONS_NUMBER ; i++)