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

[Daniel Vetter]

On Mon, May 08, 2017 at 09:33:37AM -0700, Eric Anholt wrote:
> 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?

I think generic color-key for plane compositioning would be nice, but I'm
not sure that's possible due to differences in how the key works.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch