Enable MWI mechanism if PCI bus master supports it. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
@@ -184,6 +184,7 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
return;
pci_set_master(pdev);
+ pci_try_set_mwi(pdev);
/* Special DMA address for UART */
dma->rx_dma_addr = 0xfffff000;