PIPE_VBLANK_INTERRUPT_ENABLE  525 drivers/gpu/drm/gma500/psb_intel_reg.h #define PIPE_VBLANK_INTERRUPT_ENABLE		(1UL << 17)
PIPE_VBLANK_INTERRUPT_ENABLE 5699 drivers/gpu/drm/i915/i915_reg.h #define   PIPE_VBLANK_INTERRUPT_ENABLE		(1UL << 17)