[PATCH v2 0/2] rcar-du, vsp1: rcar-gen3: Add support for colorkey alpha blending

[Eric Anholt]

Alexandru Gheorghe <Alexandru_Gheorghe at mentor.com> writes:

> Currently, rcar-du supports colorkeying  only for rcar-gen2 and it uses 
> some hw capability of the display unit(DU) which is not available on gen3.
> In order to implement colorkeying for gen3 we need to use the colorkey
> capability of the VSPD, hence the need to change both drivers rcar-du and
> vsp1.
>
> This patchset had been developed and tested on top of v4.9/rcar-3.5.1 from
> git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git

A few questions:

Are other drivers interested in supporting this property?  VC4 has the
24-bit RGB colorkey, but I don't see YCBCR support.  Should it be
documented in a generic location?

Does your colorkey end up forcing alpha to 1 for the plane when it's not
matched?
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