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From 5b05462e88dc87d83566d04dd196b4f3d9dc0eef Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
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 <fugang.duan@nxp.com>
---
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>
@@ -1544,8 +1545,17 @@ 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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