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drm/amd/display: Wrong colorimetry workaround

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[Why]
For FreeSync HDR, native color space flag in AMD VSIF(BT.709) should be
used when intepreting content and color space flag in VSC or AVI
infoFrame should be ignored. However, it turned out some userspace
application still use color flag in VSC or AVI infoFrame which is
incorrect.

[How]
Transfer function is used when building the VSC and AVI infoFrame. Set
colorimetry to BT.709 when all the following match:

1. Pixel format is YCbCr;
2. In FreeSync 2 HDR, color is COLOR_SPACE_2020_YCBCR;
3. Transfer function is TRANSFER_FUNC_GAMMA_22;

Tested-by: Mark Broadworth <mark.broadworth@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Ma Hanghong <hanghong.ma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ma Hanghong
2022-10-20 11:46:56 -04:00
committed by Alex Deucher
parent 1e8fd864af
commit b1a98cf89a
4 changed files with 17 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -5697,6 +5697,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
bool scale = dm_state ? (dm_state->scaling != RMX_OFF) : false;
int mode_refresh;
int preferred_refresh = 0;
enum color_transfer_func tf = TRANSFER_FUNC_UNKNOWN;
#if defined(CONFIG_DRM_AMD_DC_DCN)
struct dsc_dec_dpcd_caps dsc_caps;
#endif
@@ -5820,7 +5821,9 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
if (stream->link->dpcd_caps.dprx_feature.bits.VSC_SDP_COLORIMETRY_SUPPORTED)
stream->use_vsc_sdp_for_colorimetry = true;
}
mod_build_vsc_infopacket(stream, &stream->vsc_infopacket, stream->output_color_space);
if (stream->out_transfer_func->tf == TRANSFER_FUNCTION_GAMMA22)
tf = TRANSFER_FUNC_GAMMA_22;
mod_build_vsc_infopacket(stream, &stream->vsc_infopacket, stream->output_color_space, tf);
aconnector->psr_skip_count = AMDGPU_DM_PSR_ENTRY_DELAY;
}