regSDMA_GFX_RB_WPTR
wptr |= RREG32_SDMA(ring->me, regSDMA_GFX_RB_WPTR);
WREG32_SDMA(ring->me, regSDMA_GFX_RB_WPTR,
SOC15_REG_ENTRY_STR(GC, 0, regSDMA_GFX_RB_WPTR),
WREG32_SDMA(i, regSDMA_GFX_RB_WPTR, lower_32_bits(rwptr << 2));
WREG32_SDMA(i, regSDMA_GFX_RB_WPTR, 0);