drm/i915: correctly set the DDI_FUNC_CTL bpc field
Correctly erase the values previously set and also check for 6bpc and 10bpc. Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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