[PATCH 1/4] drm: add plane support

[Alan Cox]

> Not something that directly affects this patchset.. I'm thinking more
> along the lines of having a way to create a drm_framebuffer w/ more
> than one GEM buffer, one per color plane.  The other option is to bury
> this all behind a single GEM buffer.. although that seems like it
> could get ugly/hacky.

My own guess is that it will be best to have a possibly specialist
function to allocate the object, but to give it a single GEM handle. For
the most part its a list of pinned pages somewhere and while picking the
pages to use is special I am thinking that the rest of the behaviour is
probably not.

It also then means on the client side that it's a single buffer, a single
mmap and can be wrapped easily in things like libkms.

Alan