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- From 5b05462e88dc87d83566d04dd196b4f3d9dc0eef Mon Sep 17 00:00:00 2001
- From: Fugang Duan <[email protected]>
- Date: Mon, 28 Jan 2019 10:12:52 +0800
- Subject: [PATCH] tty: serial: fsl_lpuart: add modem device reset
- Add modem device reset, wthether to reset depend on dts configuration.
- Signed-off-by: Fugang Duan <[email protected]>
- ---
- drivers/tty/serial/fsl_lpuart.c | 10 ++++++++++
- 1 file changed, 10 insertions(+)
- --- a/drivers/tty/serial/fsl_lpuart.c
- +++ b/drivers/tty/serial/fsl_lpuart.c
- @@ -22,6 +22,7 @@
- #include <linux/of_dma.h>
- #include <linux/pm_domain.h>
- #include <linux/pm_runtime.h>
- +#include <linux/reset.h>
- #include <linux/serial_core.h>
- #include <linux/slab.h>
- #include <linux/tty_flip.h>
- @@ -1542,8 +1543,17 @@ static void lpuart32_configure(struct lp
- static int lpuart32_startup(struct uart_port *port)
- {
- struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
- + struct tty_port *tty_port = &sport->port.state->port;
- unsigned long flags;
- unsigned long temp;
- + int ret;
- +
- + /* some modem may need reset */
- + if (!tty_port_suspended(tty_port)) {
- + ret = device_reset(sport->port.dev);
- + if (ret && ret != -ENOENT)
- + return ret;
- + }
-
- /* determine FIFO size */
- temp = lpuart32_read(&sport->port, UARTFIFO);
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