[RFC][PATCH 0/10] Atomic modesetting v2

Second version of the atomic mode setting work. Still very much work in progress.

I decided that I can't afford to fight the drm_crtc_helper architecture due to the sheer amount of driver code depending on it. So I changed the code to do things in way that more closely matches drm_crtc_helper.

Next I'll be moving the buffer pinning to happen before any hw state is clobbered. This will avoid having to do actual rollbacks when pinning fails. And a similar treatment needs to be done to the PLL calculations (those should be done before buffer pinning).

I didn't re-post all the i915 specific bits I have in my tree since those didn't really change. I pushed the whole work to the drm_atomic_2 branch at https://gitorious.org/vsyrjala/linux.