[PATCH v1 1/1] serial: 8250_lpss: Enable DMA on Intel Elkhart Lake
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LANDED
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: 2021-07-21 16:25:38
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Subsystem:
8250/16?50 (and clone uarts) serial driver, synopsys designware 8250 uart driver, the rest, tty layer and serial drivers · Maintainers:
Greg Kroah-Hartman, Ilpo Järvinen, Linus Torvalds, Jiri Slaby
Landed in mainline as 0a9410b981e9 on 2021-07-27.
PSE UARTs on Intel Elkhart Lake support DMA mode. Enable DMA on these ports. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> --- drivers/tty/serial/8250/8250_lpss.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
index 4dee8a9e0c95..848d81e3838c 100644
--- a/drivers/tty/serial/8250/8250_lpss.c
+++ b/drivers/tty/serial/8250/8250_lpss.c@@ -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; }
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2.30.2