[RFC] Updated plane support v3

[Marcus Lorentzon]

On 06/22/2011 03:09 AM, Rob Clark wrote:
> But I'm at least under the impression that some of the other SoC's
> have similar flexibility to use video planes as either primary or
> overlay layers.  So I figure it is at least worth trying to handle
> this in a more generic way if it doesn't cause too much ugliness to
> KMS core.
>    
Yes, our DSS have similar flexibility. That is, we don't have a special 
fullscreen framebuffer for the crtc. Instead we have generic "overlays" 
for all framebuffers that can be positioned anywhere and have any 
format, all on a background color of choice. So we are happy with a more 
generic approach where current implementation use a default plane for 
crtc fb. But it should not hog HW resources when not used. If a plane is 
used, I think it should be a "normal" plane that the user can control 
and enumerate.

/BR
/Marcus