VERT_INTERP_MASK  213 drivers/gpu/drm/gma500/psb_intel_reg.h #define VERT_INTERP_MASK		(3 << 10)
VERT_INTERP_MASK 4783 drivers/gpu/drm/i915/i915_reg.h #define   VERT_INTERP_MASK	(3 << 10)