drm/i915: Unlock PPS registers after GPU reset
Reapply the PPS register unlock workaround after GPU reset on platforms where the reset clobbers the display HW state. This at least gets rid of the related WARN during LVDS encoder enabling on PNV. Fixes: ed6143b8 ("drm/i915/lvds: Restore initial HW state during encoder enabling") Reported-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NImre Deak <imre.deak@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1473847453-4771-1-git-send-email-imre.deak@intel.comReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> (cherry picked from commit 51f59205) Signed-off-by: NJani Nikula <jani.nikula@intel.com>
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