mmSDMA0_GFX_DOORBELL
doorbell = RREG32(mmSDMA0_GFX_DOORBELL + sdma_offsets[i]);
WREG32(mmSDMA0_GFX_DOORBELL + sdma_offsets[i], doorbell);
doorbell = RREG32(sdma_v4_0_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL));
WREG32(sdma_v4_0_get_reg_offset(adev, i, mmSDMA0_GFX_DOORBELL), doorbell);