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serial: 8250_lpss: Use 32-bit reads

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Use 32-bit reads in order to not lose higher bits of DW UART regs. This
change does not fix any known issue as the high bits are not used for
anything related to 8250 driver (dw8250_readl_ext and dw8250_writel_ext
used within the dwlib are already doing
readl/writel/ioread32be/iowrite32be anyway).

This change is necessary to enables 9th bit address mode. DW UART
reports address frames with BIT(8) of LSR.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220624204210.11112-4-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-06-24 23:42:07 +03:00 committed by Greg Kroah-Hartman
parent 507bd6fbaa
commit 79b3e69fa4
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/serial/8250/8250_lpss.c
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@ -330,7 +330,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
uart.port.irq = pci_irq_vector(pdev, 0);
uart.port.private_data = &lpss->data;
uart.port.type = PORT_16550A;
uart.port.iotype = UPIO_MEM;
uart.port.iotype = UPIO_MEM32;
uart.port.regshift = 2;
uart.port.uartclk = lpss->board->base_baud * 16;
uart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;