drm/i915: Add chv cmnlane power wells
CHV has two display PHYs so there are also two cmnlane power wells. Add the approriate code to power the wells up/down. Like on VLV we do the cmnreset assert/deassert and the DPLL refclock enabling at approriate times. This code actually works on my bsw. Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: NImre Deak <imre.deak@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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