G_028800_BACKFACE_ENABLE 1895 drivers/gpu/drm/radeon/evergreend.h #define   G_028800_BACKFACE_ENABLE(x)                  (((x) >> 7) & 0x1)
G_028800_BACKFACE_ENABLE 2343 drivers/gpu/drm/radeon/r600d.h #define   G_028800_BACKFACE_ENABLE(x)                  (((x) >> 7) & 0x1)