[PATCH] DRM planes

[Jesse Barnes]

In response to feedback, I've adjusted the new addfb2 ioctl to take per
component pitch and offset args.  Generally, the offset[0] field will be
0, but it's conceivable that some metadata could be stored at the start
of a given buffer, and an offset[0] allows the client to skip past that.
Similarly, pitch[0] will typically describe the whole buffer, but it's
possible to simply string together several planes into a single object
where individual pitch components matter.

Userland patches are available in the drm-overlays branches of my
personal libdrm and xf86-video-intel trees at freedesktop.org.  The
xf86-video-intel side works well enough to handle clipping (using a new
i915 specific ioctl for setting a destination color key) and play
videos, albeit without nice flipping.

Assuming no major objections, I think this is finally ready for
drm-next.

Thanks,
Jesse