drm/i915: Enable DPIO SUS clock gating on CHV
CHV has supports some form of automagic clock gating for the DPIO SUS clock. We can simply enable the magic bits and the hardware should take care of the rest. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NDeepak S <deepak.s@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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