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serial: 8250_lpss: Enable DMA on Intel Elkhart Lake

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PSE UARTs on Intel Elkhart Lake support DMA mode.
Enable DMA on these ports.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210721162452.48764-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andy Shevchenko 2021-07-21 19:24:52 +03:00 committed by Greg Kroah-Hartman
parent f444f34b4a
commit 0a9410b981
1 changed files with 10 additions and 0 deletions
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10
drivers/tty/serial/8250/8250_lpss.c
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@ -158,6 +158,16 @@ static int byt_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
static int ehl_serial_setup(struct lpss8250 *lpss, struct uart_port *port)
{
struct uart_8250_dma *dma = &lpss->data.dma;
struct uart_8250_port *up = up_to_u8250p(port);
/*
* This simply makes the checks in the 8250_port to try the DMA
* channel request which in turn uses the magic of ACPI tables
* parsing (see drivers/dma/acpi-dma.c for the details) and
* matching with the registered General Purpose DMA controllers.
*/
up->dma = dma;
return 0;
}