drm/i915: add DP support to intel_enable_ddi
We should only write the DDI_BUF_CTL at this point for HDMI/DVI. For DP we need to do this earlier, and the values written to the register are also different. Signed-off-by: NPaulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NDamien Lespiau <damien.lespiau@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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