tegra_ivc_flush
tegra_ivc_flush(ivc, ivc->rx.phys + rx);
tegra_ivc_flush(ivc, ivc->tx.phys + tx);
tegra_ivc_flush(ivc, ivc->tx.phys + offset);
tegra_ivc_flush(ivc, ivc->tx.phys + offset);
tegra_ivc_flush(ivc, ivc->tx.phys + offset);
tegra_ivc_flush(ivc, ivc->tx.phys + offset);