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drm/amd/display: Limit user regamma to a valid value

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[ Upstream commit 3601d620f22e37740cf73f8278eabf9f2aa19eb7 ]

[Why]
For HDR mode, we get total 512 tf_point and after switching to SDR mode
we actually get 400 tf_point and the rest of points(401~512) still use
dirty value from HDR mode. We should limit the rest of the points to max
value.

[How]
Limit the value when coordinates_x.x > 1, just like what we do in
translate_from_linear_space for other re-gamma build paths.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Pavle Kotarac <Pavle.Kotarac@amd.com>
Signed-off-by: Yao Wang1 <Yao.Wang1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yao Wang1 2022-08-22 18:30:31 +08:00 committed by Greg Kroah-Hartman
parent c89849ecfd
commit 75ed7dee26
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/modules/color/color_gamma.c
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@ -1486,6 +1486,7 @@ static void interpolate_user_regamma(uint32_t hw_points_num,
struct fixed31_32 lut2;
struct fixed31_32 delta_lut;
struct fixed31_32 delta_index;
const struct fixed31_32 one = dc_fixpt_from_int(1);
i = 0;
/* fixed_pt library has problems handling too small values */
@ -1514,6 +1515,9 @@ static void interpolate_user_regamma(uint32_t hw_points_num,
} else
hw_x = coordinates_x[i].x;
if (dc_fixpt_le(one, hw_x))
hw_x = one;
norm_x = dc_fixpt_mul(norm_factor, hw_x);
index = dc_fixpt_floor(norm_x);
if (index < 0 || index > 255)