HS_CTRL_FIFO_HALF_EMPTY  976 drivers/gpu/drm/gma500/psb_intel_reg.h #define HS_CTRL_FIFO_HALF_EMPTY			(1 << 17)
HS_CTRL_FIFO_HALF_EMPTY 10825 drivers/gpu/drm/i915/i915_reg.h #define  HS_CTRL_FIFO_HALF_EMPTY			(1 << 17)