[PATCH i-g-t v3] tests: (Re)add kms_crtc_background_color test

[Cristian Ciocaltea]

Hi,

On 12/19/25 11:27 PM, Cristian Ciocaltea wrote:
> Provide test to verify the behavior of BACKGROUND_COLOR DRM CRTC
> property.
> 
> This is achieved by filling a full-screen primary plane with a given
> color and comparing the resulting CRC with the one obtained after
> turning off all planes while having the CRTC background set to the same
> color.
> 
> Also note this is a reworked version of the test that has been dropped
> over 5 years ago via commit 33f07391e5f6 ("tests: Remove
> kms_crtc_background_color test"), as the required kernel changes never
> landed because of missing support in userland.

The kernel series introducing the BACKGROUND_COLOR CRTC property has been picked
up [1] and is available since drm-misc-next-2026-03-20 [2].

Regards,
Cristian

[1] https://lore.kernel.org/all/CAPj87rMW=4=0y_WZAhaLWhnEG1e-sF+Cn4XR57+p+d5wy9BvkA@mail.gmail.com/
[2] https://gitlab.freedesktop.org/drm/misc/kernel/-/commits/drm-misc-next-2026-03-20