drm/i915: Hold the pps mutex across the whole panel power enable sequence
Just grab the pps_mutex once and do all the pps panel startup operations while holding the mutex instead of grabbing the mutex separately for each individual step. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NImre Deak <imre.deak@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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