drm/i915: Also disable PSR on Sink when disabling it on Source.
It is not a bad idea to disable the PSR feature on Sink when we are disabling on the Source. v2: Move dpcd write inside mutex protected area as suggested by Sonika. Cc: Sonika Jindal <sonika.jindal@intel.com> Suggested-by: Sonika Jindal <sonika.jindal@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Reviewed-by: Sonika Jindal <sonika.jindal@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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