mmUVD_JRBC_RB_RPTR
WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_RPTR, ring->wptr);
return RREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_RPTR);
reg = SOC15_REG_OFFSET(UVD, 0, mmUVD_JRBC_RB_RPTR);
WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_RPTR, 0);