[PATCH 0/4] drm/i915: Make video sprites survive a modeset

[ville.syrjala at linux.intel.com]

Currently the video sprites appear to get disabled on modeset more by
accient than by design.

With the current API that behaviour makes very little sense to me.
You first enable some plane, and then it can get disabled due to some
unrelated operation.

So these patches change the behaviour so that planes survive a modeset.
There's a new hook to make sure they get disabled when swithing
back to fbdev to show a panic oops.