Merge tag 'drm-intel-fixes-2015-10-16' of git://anongit.freedesktop.org/drm-intel into drm-fixes

The revert dance could use some explanation: we had stuff fixed in
-next, and initially backported one commit to v4.3. Now, turns out we
need more fixes, and we could cherry-pick them all without conflicts if
we reverted the backported one first. So did that to not have to edit
and backport them all.

* tag 'drm-intel-fixes-2015-10-16' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Add primary plane to mask if it's visible
  drm/i915: Move sprite/cursor plane disable to intel_sanitize_crtc()
  drm/i915: Assign hwmode after encoder state readout
  Revert "drm/i915: Add primary plane to mask if it's visible"
  drm/i915: Deny wrapping an userptr into a framebuffer
  drm/i915: Enable DPLL VGA mode before P1/P2 divider write
  drm/i915: Restore lost DPLL register write on gen2-4
  drm/i915: Flush pipecontrol post-sync writes
  drm/i915: Fix kerneldoc for i915_gem_shrink_all