mmUVD_GP_SCRATCH4
WREG32(mmUVD_GP_SCRATCH4, adev->uvd.max_handles);
WREG32_SOC15(UVD, i, mmUVD_GP_SCRATCH4, adev->uvd.max_handles);
MMSCH_V1_0_INSERT_DIRECT_WT(SOC15_REG_OFFSET(UVD, i, mmUVD_GP_SCRATCH4), adev->uvd.max_handles);