Re: [PATCH v3] drm: Guard DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE

[Maarten Lankhorst]

Hey,

On 7/7/26 10:03, Borah, Chaitanya Kumar wrote:
> 
> 
> On 7/3/2026 1:02 PM, Robert Mader wrote:
>> The client cap is currently advertised unconditionally, even for drivers
>> that do not support plane color pipelines. If clients supporting the later,
> 
> s/later/latter
> 
>> like Wayland compositors or tools like drm_info, enable the client cap on
>> such drivers they will be left without both color pipeline and the legacy
>> properties COLOR_ENCODING and COLOR_RANGE, effectively breaking YUV->RGB
>> conversion support.
>>
>> Prevent that by only marking the cap supported if there are actually planes
>> with color pipelines.
>>
>> Note: while the color pipeline replacement for the legacy properties is
>> still under review (1), we can assume that it will work as a drop-in
>> replacement.
> 
> This change will but a driver can also choose to export colorops like programmable CTM_3x4 to achieve the same.
> 
> We should also perhaps document this somewhere that if a driver supports LEGACY properties, it is imperative to implement some version of it with the color pipeline line property.

Would this be doable inside drm core? Implement the color pipeline properties, get the fixed pipeline for free?

But thanks for all feedback, as I was about to push this patch, I noticed it still uses -EOPNOTSUPP, can it be changed to -EINVAL?

~Maarten