drm/i915: Add a note explaining vdd on/off handling in intel_dp_aux_ch()
Add a comment to explain why we care about the current want_panel_vdd state in intel_dp_aux_ch(). Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NJani Nikula <jani.nikula@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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