CRTC_EN            32 drivers/gpu/drm/radeon/avivod.h #define		CRTC_EN						(1 << 0)
CRTC_EN           620 include/video/mach64.h #define CRTC_EN			0x02000000
CRTC_EN           546 include/video/radeon.h #define CRTC_EN					   (1 << 25)