2020-04-10 02:47:05 +00:00
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From 5b05462e88dc87d83566d04dd196b4f3d9dc0eef Mon Sep 17 00:00:00 2001
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From: Fugang Duan <fugang.duan@nxp.com>
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Date: Mon, 28 Jan 2019 10:12:52 +0800
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Subject: [PATCH] tty: serial: fsl_lpuart: add modem device reset
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Add modem device reset, wthether to reset depend on dts configuration.
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Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
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---
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drivers/tty/serial/fsl_lpuart.c | 10 ++++++++++
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1 file changed, 10 insertions(+)
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--- a/drivers/tty/serial/fsl_lpuart.c
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+++ b/drivers/tty/serial/fsl_lpuart.c
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@@ -22,6 +22,7 @@
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#include <linux/of_dma.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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+#include <linux/reset.h>
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#include <linux/serial_core.h>
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#include <linux/slab.h>
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#include <linux/tty_flip.h>
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2022-07-03 16:46:35 +00:00
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@@ -1552,8 +1553,17 @@ static void lpuart32_configure(struct lp
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2020-04-10 02:47:05 +00:00
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static int lpuart32_startup(struct uart_port *port)
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{
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struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
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+ struct tty_port *tty_port = &sport->port.state->port;
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unsigned long flags;
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unsigned long temp;
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+ int ret;
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+
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+ /* some modem may need reset */
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+ if (!tty_port_suspended(tty_port)) {
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+ ret = device_reset(sport->port.dev);
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+ if (ret && ret != -ENOENT)
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+ return ret;
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+ }
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/* determine FIFO size */
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temp = lpuart32_read(&sport->port, UARTFIFO);
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