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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2021-07-21 19:24:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-27 12:08:20 +0200 |
| commit | 0a9410b981e961a24057dceee54bb5d36309a0c4 (patch) | |
| tree | e010df461a716b747904ea46d88fdbbd95d5f491 | |
| parent | f444f34b4a1afcd2133daaa73778673ca09fb564 (diff) | |
| download | linux-0a9410b981e961a24057dceee54bb5d36309a0c4.tar.gz linux-0a9410b981e961a24057dceee54bb5d36309a0c4.tar.bz2 linux-0a9410b981e961a24057dceee54bb5d36309a0c4.zip | |
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: 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>
| -rw-r--r-- | drivers/tty/serial/8250/8250_lpss.c | 10 |
1 files changed, 10 insertions, 0 deletions
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; } |