mmUVD_JRBC_RB_WPTR
WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR, ring->wptr);
ring->wptr = RREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR);
return RREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR);
WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR, lower_32_bits(ring->wptr));
WREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR, 0);
ring->wptr = RREG32_SOC15(UVD, 0, mmUVD_JRBC_RB_WPTR);