drm/i915: make runtime PM swizzling/ring_freq init platform independent
We need to re-init sizzling on all platforms so move it to the platform independent runtime resume callback. The ring frequency reinit is also needed everywhere except on VLV, but gen6_update_ring_freq() will be a noop on VLV, so we can move this function too to platform independent code. Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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