This comment is misleading -- the patch replaces a call to intel_wait_for_vblank with a call to intel_flush_display_plane.
From my reading of the docs, enable requires two actions: 1) DSPACNTR with enable going from 0->1 2) wait for vblank At disable, three actions are required: 1) DSPACNTR with enable going from 1->0 2) DSPASURF(965+)/DSPAADDR(otherwise) write to trigger the register updates 3) wait for vblank -- keith.pack...@intel.com
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