drm/i915/mst: Wait for ACT sent before enabling the pipe
The correct sequence according to bspec is to wait for the ACT sent status before we turn on the pipe. Make it so. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200507144125.2458-1-ville.syrjala@linux.intel.comReviewed-by: Imre Deak <imre.deak@intel.com>
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