[PATCH v2 0/2] Introduce BACKGROUND_COLOR DRM CRTC property

[Dmitry Baryshkov]

On Mon, Oct 13, 2025 at 09:27:17PM +0300, Cristian Ciocaltea wrote:
> Some display controllers can be hardware-configured to present non-black
> colors for pixels which are not covered by any plane (or are exposed
> through transparent regions of higher planes).
> 
> The first patch of the series introduces the BACKGROUND_COLOR DRM
> property that can be attached to a CRTC via a dedicated helper function.
> A 64-bit ARGB color value format is also defined and can be manipulated
> with the help of a few utility macros.


Please provide IGT tests. I'd at least check that using the
BACKGROUND_COLOR results in the same CRC as then one when there is a
plane covering the whole screen.

Additional note. I see a value in having the CRTC property for the
background colour. However it might be more flexible to reuse old
proposal for solid fill planes ([1]) and instead implement the lowest
Z-order plane supporting only solid fill colour as an image source.

[1] https://lore.kernel.org/dri-devel/20231027-solid-fill-v7-0-780188bfa7b2@quicinc.com/

-- 
With best wishes
Dmitry