drm/i915: Implement port sync for SKL+
Transcoder port sync was introduced to the hardware in BDW. We can trivially enable it for SKL+ since the same codepaths are already used for ICL+ port sync. The only difference is the actual location of the bits we need to poke. We leave BDW out (at least for now) since it uses different modeset paths that haven't been adapted for port sync, and IIRC using the feature would involve some extra workarounds we've not implemented. Pre-BDW hardware does not support port sync so we'd have to tweak the modeset sequence to start the pipes as close together as possible and hope for the best. So far no one has seriously tried to implement that. Closes: https://gitlab.freedesktop.org/drm/intel/issues/27Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200313164831.5980-9-ville.syrjala@linux.intel.comReviewed-by: Manasi Navare <manasi.d.navare@intel.com>
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