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serial: 8250_lpss: set PCI master only for private DMA 

There is no need to set PCI bus mastering when device is not doing any DMA.
Though on Intel Quark DMA is a part of UART IP and thus shares same device in
Linux kernel.

Enable bus mastering only for Quark case.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Andy Shevchenko 2016-10-10 11:27:18 +03:00 committed by Greg Kroah-Hartman
parent 0fe07647cc
commit 3f3a46951e
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/8250/8250_lpss.c
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@ -183,6 +183,8 @@ static void qrk_serial_setup_dma(struct lpss8250 *lpss, struct uart_port *port)
if (ret)
return;
pci_set_master(pdev);
/* Special DMA address for UART */
dma->rx_dma_addr = 0xfffff000;
dma->tx_dma_addr = 0xfffff000;
@ -280,8 +282,6 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (ret)
return ret;
pci_set_master(pdev);
lpss = devm_kzalloc(&pdev->dev, sizeof(*lpss), GFP_KERNEL);
if (!lpss)
return -ENOMEM;