PIPE_DPST_EVENT_STATUS  520 drivers/gpu/drm/gma500/psb_intel_reg.h #define PIPE_DPST_EVENT_STATUS			(1UL << 7)
PIPE_DPST_EVENT_STATUS 5712 drivers/gpu/drm/i915/i915_reg.h #define   PIPE_DPST_EVENT_STATUS		(1UL << 7)