RLC_HB_WPTR_MSB_ADDR  397 drivers/gpu/drm/radeon/evergreend.h #define RLC_HB_WPTR_MSB_ADDR                              0x3f18
RLC_HB_WPTR_MSB_ADDR  692 drivers/gpu/drm/radeon/r600d.h #define RLC_HB_WPTR_MSB_ADDR                              0x3f18