AHCI_DWC_PORT_DMACR
dmacr = readl(port_mmio + AHCI_DWC_PORT_DMACR);
writel(dmacr, port_mmio + AHCI_DWC_PORT_DMACR);
writel(dpriv->dmacr[i], port_mmio + AHCI_DWC_PORT_DMACR);