Re: [PATCH] drm/amd/display: expose plane blend LUT in HW with MCM

[Matthew Schwartz <matthew.schwartz@linux.dev>]

On 2/2/26 6:03 PM, Melissa Wen wrote:
> 
> On 09/12/2025 12:09, Melissa Wen wrote:
>> Since commit 39923050615cd ("drm/amd/display: Clear DPP 3DLUT Cap")
>> there is a flag in the mpc_color_caps that indicates the pre-blend usage
>> of MPC color caps. Do the same as commit a0c3e8bfbab6 ("drm/amd/display:
>> Use mpc.preblend flag to indicate preblend") and use the mpc.preblend
>> flag to expose plane blend LUT/TF properties on AMD display driver.
> 
> A gentle ping here.
> 
> Melissa
> 
>>
>> CC: Matthew Schwartz <matthew.schwartz@linux.dev>

I can confirm this adds back color management capabilities in gamescope on DCN35 and DCN351.

Tested-by: Matthew Schwartz <matthew.schwartz@linux.dev>

>> Signed-off-by: Melissa Wen <mwen@igalia.com>
>> ---
>>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
>> index 56cb866ac6f8..b15f0cf86008 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c
>> @@ -1649,7 +1649,7 @@ dm_atomic_plane_attach_color_mgmt_properties(struct amdgpu_display_manager *dm,
>>                          MAX_COLOR_3DLUT_SIZE);
>>       }
>>   -    if (dpp_color_caps.ogam_ram) {
>> +    if (dpp_color_caps.ogam_ram || dm->dc->caps.color.mpc.preblend) {
>>           drm_object_attach_property(&plane->base,
>>                          mode_info.plane_blend_lut_property, 0);
>>           drm_object_attach_property(&plane->base,
>