[Intel-gfx] [PATCH 0/9] drm/i915: Plane rotation support

[ville.syrjala at linux.intel.com]

Recently some people from inside Intel have showed some interest in 180
degree plane rotation. To avoid a huge mess, I decided that I should
implement the feature properly.

So I snatched the rotation property from omapdrm, and moved some of the
code into drm_crtc.c, added a bunch of helper stuff to drm_crtc/rect
and implemented the relevant bits in i915. I didn't touch cursor or
primary planes at all. I'm sort of hoping we might do the drm_plane
conversion sometime soonish and then we'd avoid adding a bunch of
plane properties to the crtc.

One thing I don't really like is the current way of stuffing the bit
number into the enum_list resulting in DRM_ROTATE_FOO being just the bit
number. I'd prefer to make DRM_ROTATE_FOO the shifted bitmask. But I'm 
not sure if changing that would cause grief to userspace, so I left it
alone for now.