PIPE_GMCH_DATA_N_MASK 1502 drivers/gpu/drm/gma500/psb_intel_reg.h #define   PIPE_GMCH_DATA_N_MASK			(0xffffff)
PIPE_GMCH_DATA_N_MASK 5595 drivers/gpu/drm/i915/i915_reg.h #define   PIPE_GMCH_DATA_N_MASK			(0xffffff)