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so far vblank interrupt on ironlake is disabled, this would cause bad gfx performance if userspace calls drm_wait_vblank. This patch enables vblank interrupt on ironlake and follows vblank get/put model. Signed-off-by: Li Peng <peng.li@intel.com> Acked-by: Zhenyu Wang <zhenyuw@linux.intel.com> Signed-off-by: Eric Anholt <eric@anholt.net>