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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2021-07-21 19:24:52 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-27 12:08:20 +0200
commit0a9410b981e961a24057dceee54bb5d36309a0c4 (patch)
treee010df461a716b747904ea46d88fdbbd95d5f491 /drivers/tty
parentf444f34b4a1afcd2133daaa73778673ca09fb564 (diff)
downloadlinux-0a9410b981e961a24057dceee54bb5d36309a0c4.tar.bz2
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>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_lpss.c10
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;
}