From: Joshua Ashton <joshua@xxxxxxxxx>
Unlike degamma, blend gamma doesn't support hardcoded curve
(predefined/ROM), but we can use AMD color module to fill blend gamma
parameters when we have non-linear plane gamma TF without plane gamma
LUT. The regular degamma path doesn't hit this.
Signed-off-by: Joshua Ashton <joshua@xxxxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_color.c | 21 ++++++++++++-------
1 file changed, 13 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
index e17141fc8d12..baa7fea9ebae 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
@@ -349,21 +349,26 @@ static int __set_input_tf(struct dc_transfer_func *func,
struct dc_gamma *gamma = NULL;
bool res;
- gamma = dc_create_gamma();
- if (!gamma)
- return -ENOMEM;
+ if (lut_size) {
+ gamma = dc_create_gamma();
+ if (!gamma)
+ return -ENOMEM;
- gamma->type = GAMMA_CUSTOM;
- gamma->num_entries = lut_size;
+ gamma->type = GAMMA_CUSTOM;
+ gamma->num_entries = lut_size;
- __drm_lut_to_dc_gamma(lut, gamma, false);
+ __drm_lut_to_dc_gamma(lut, gamma, false);
+ }
- res = mod_color_calculate_degamma_params(NULL, func, gamma, true);
- dc_gamma_release(&gamma);
+ res = mod_color_calculate_degamma_params(NULL, func, gamma, gamma != NULL);
+
+ if (gamma)
+ dc_gamma_release(&gamma);
return res ? 0 : -ENOMEM;
}
+
#ifdef CONFIG_STEAM_DECK
static enum dc_transfer_func_predefined drm_tf_to_dc_tf(enum drm_transfer_function drm_tf)
{
--
2.39.2
