Commit 0a9410b9 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman
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serial: 8250_lpss: Enable DMA on Intel Elkhart Lake 



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

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210721162452.48764-1-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f444f34b

drivers/tty/serial/8250/8250_lpss.c

+10 −0
Original line number Diff line number Diff line
@@ -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;

}