mmSDMA0_GFX_RB_RPTR
WREG32(mmSDMA0_GFX_RB_RPTR + sdma_offsets[i], 0);
WREG32(mmSDMA0_GFX_RB_RPTR + sdma_offsets[i], 0);
WREG32(mmSDMA0_GFX_RB_RPTR + sdma_offsets[i], 0);
WREG32(sdma_v4_0_get_reg_offset(adev, i, mmSDMA0_GFX_RB_RPTR), 0);