From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>
Subject: [PATCH v1 1/1] serial: 8250_lpss: Enable DMA on Intel Elkhart Lake
Date: Wed, 21 Jul 2021 19:24:52 +0300 [thread overview]
Message-ID: <20210721162452.48764-1-andriy.shevchenko@linux.intel.com> (raw)
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;
}
--
2.30.2
reply other threads:[~2021-07-21 16:25 UTC|newest]
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