HS_DATA_FIFO_HALF_EMPTY  970 drivers/gpu/drm/gma500/psb_intel_reg.h #define HS_DATA_FIFO_HALF_EMPTY			(1 << 1)
HS_DATA_FIFO_HALF_EMPTY 10831 drivers/gpu/drm/i915/i915_reg.h #define  HS_DATA_FIFO_HALF_EMPTY			(1 << 1)