| 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> |
| @@ -1572,8 +1573,17 @@ 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); |