Commits
Ville Syrjälä committed 81e7f2002b7
drm/i915: Idle unused rings on gen2/3 during init/resume gen2/3 platforms have a boatload of rings we're not using. On my 830 the BIOS/hw can leave some of those "active" after resume which will prevent c3 entry. The ring is apparently considered active whenever head != tail even if the ring is disabled. Disable and clear all such unused ringbuffers on init/resume. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>