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drm/amd/display: Use the correct input TF for video formats

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[Why]
Color blending for NV12 formats is incorrect because we're using the
predefined SRGB degamma.

[How]
Calculate the correct input transfer function for degamma from the color
module depending on what the actual surface format is.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Zhan Liu <Zhan.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2020-03-31 16:50:12 -04:00 committed by Alex Deucher
parent d2bacc38f6
commit 2059fc5e8c
1 changed files with 19 additions and 3 deletions
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22
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
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@ -420,9 +420,21 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
{
const struct drm_color_lut *degamma_lut;
struct dc_plane_state *dc_plane_state = plane->dc_state;
enum dc_transfer_func_predefined tf = TRANSFER_FUNCTION_SRGB;
uint32_t degamma_size;
int r;
/* Get the correct base transfer function for implicit degamma. */
switch (dc_plane_state->format) {
case SURFACE_PIXEL_FORMAT_VIDEO_420_YCbCr:
case SURFACE_PIXEL_FORMAT_VIDEO_420_YCrCb:
/* DC doesn't have a transfer function for BT601 specifically. */
tf = TRANSFER_FUNCTION_BT709;
break;
default:
break;
}
if (crtc->cm_has_degamma) {
degamma_lut = __extract_blob_lut(crtc->base.degamma_lut,
&degamma_size);
@ -456,8 +468,7 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
* map these to the atomic one instead.
*/
if (crtc->cm_is_degamma_srgb)
dc_plane_state->in_transfer_func->tf =
TRANSFER_FUNCTION_SRGB;
dc_plane_state->in_transfer_func->tf = tf;
else
dc_plane_state->in_transfer_func->tf =
TRANSFER_FUNCTION_LINEAR;
@ -472,7 +483,12 @@ int amdgpu_dm_update_plane_color_mgmt(struct dm_crtc_state *crtc,
* in linear space. Assume that the input is sRGB.
*/
dc_plane_state->in_transfer_func->type = TF_TYPE_PREDEFINED;
dc_plane_state->in_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
dc_plane_state->in_transfer_func->tf = tf;
if (tf != TRANSFER_FUNCTION_SRGB &&
!mod_color_calculate_degamma_params(
dc_plane_state->in_transfer_func, NULL, false))
return -ENOMEM;
} else {
/* ...Otherwise we can just bypass the DGM block. */
dc_plane_state->in_transfer_func->type = TF_TYPE_BYPASS;