Merge tag 'drm-intel-fixes-2015-08-14' of git://anongit.freedesktop.org/drm-intel into drm-next

three display fixes for Intel.

* tag 'drm-intel-fixes-2015-08-14' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Commit planes on each crtc separately.
  drm/i915: calculate primary visibility changes instead of calling from set_config
  drm/i915: Only dither on 6bpc panels