GRBM_PWR_CNTL 261 drivers/gpu/drm/radeon/r600_dpm.c WREG32(GRBM_PWR_CNTL, 0x1); GRBM_PWR_CNTL 262 drivers/gpu/drm/radeon/r600_dpm.c RREG32(GRBM_PWR_CNTL);