From: Yao Wang1 Yao.Wang1@amd.com
[ 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 --- drivers/gpu/drm/amd/display/modules/color/color_gamma.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c index e042d8ce05b4..22d105635e33 100644 --- a/drivers/gpu/drm/amd/display/modules/color/color_gamma.c +++ b/drivers/gpu/drm/amd/display/modules/color/color_gamma.c @@ -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)