pvrdma_read_reg
err = pvrdma_read_reg(dev, PVRDMA_REG_ERR);
ret = pvrdma_read_reg(dev, PVRDMA_REG_ERR);
if (pvrdma_read_reg(dev, PVRDMA_REG_ERR))
icr = pvrdma_read_reg(dev, PVRDMA_REG_ICR);
dev->dsr_version = pvrdma_read_reg(dev, PVRDMA_REG_VERSION);