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drm/amd/display: add comments to describe DM crtc color mgmt behavior

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Describe some expected behavior of the AMD DM color mgmt programming.

Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Melissa Wen 2023-11-16 18:57:53 -01:00 committed by Alex Deucher
parent 0f5afa190b
commit 98fbb52772
1 changed files with 14 additions and 2 deletions
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16
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c
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@ -661,13 +661,25 @@ int amdgpu_dm_update_crtc_color_mgmt(struct dm_crtc_state *crtc)
crtc->cm_is_degamma_srgb = true;
stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_SRGB;
/*
* Note: although we pass has_rom as parameter here, we never
* actually use ROM because the color module only takes the ROM
* path if transfer_func->type == PREDEFINED.
*
* See more in mod_color_calculate_regamma_params()
*/
r = __set_legacy_tf(stream->out_transfer_func, regamma_lut,
regamma_size, has_rom);
if (r)
return r;
} else if (has_regamma) {
/* If atomic regamma, CRTC RGM goes into RGM LUT. */
/*
* CRTC RGM goes into RGM LUT.
*
* Note: there is no implicit sRGB regamma here. We are using
* degamma calculation from color module to calculate the curve
* from a linear base.
*/
stream->out_transfer_func->type = TF_TYPE_DISTRIBUTED_POINTS;
stream->out_transfer_func->tf = TRANSFER_FUNCTION_LINEAR;