LP_DATA_FIFO_HALF_EMPTY  973 drivers/gpu/drm/gma500/psb_intel_reg.h #define LP_DATA_FIFO_HALF_EMPTY			(1 << 9)
LP_DATA_FIFO_HALF_EMPTY 10828 drivers/gpu/drm/i915/i915_reg.h #define  LP_DATA_FIFO_HALF_EMPTY			(1 << 9)