drm/i915: Convert DIP port switch cases to a simple macro
We have a couple of switch cases to compute the port value for the VIDEO_DIP_CTL register. Replace them with a simple macro. We do lose a few BUG() calls, but many people may consider that an improvement. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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