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Ville Syrjälä authored
VLV/CHV have backlight controls only on pipes A and B. Bail out without touching registers that don't exist, and print a warning. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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