PIPE_LEGACY_BLC_EVENT_ENABLE  528 drivers/gpu/drm/gma500/psb_intel_reg.h #define PIPE_LEGACY_BLC_EVENT_ENABLE		(1UL << 22)
PIPE_LEGACY_BLC_EVENT_ENABLE 5691 drivers/gpu/drm/i915/i915_reg.h #define   PIPE_LEGACY_BLC_EVENT_ENABLE		(1UL << 22)