| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | From 5b05462e88dc87d83566d04dd196b4f3d9dc0eef Mon Sep 17 00:00:00 2001 |
| 2 | From: Fugang Duan <fugang.duan@nxp.com> |
| 3 | Date: Mon, 28 Jan 2019 10:12:52 +0800 |
| 4 | Subject: [PATCH] tty: serial: fsl_lpuart: add modem device reset |
| 5 | |
| 6 | Add modem device reset, wthether to reset depend on dts configuration. |
| 7 | |
| 8 | Signed-off-by: Fugang Duan <fugang.duan@nxp.com> |
| 9 | --- |
| 10 | drivers/tty/serial/fsl_lpuart.c | 10 ++++++++++ |
| 11 | 1 file changed, 10 insertions(+) |
| 12 | |
| 13 | --- a/drivers/tty/serial/fsl_lpuart.c |
| 14 | +++ b/drivers/tty/serial/fsl_lpuart.c |
| 15 | @@ -22,6 +22,7 @@ |
| 16 | #include <linux/of_dma.h> |
| 17 | #include <linux/pm_domain.h> |
| 18 | #include <linux/pm_runtime.h> |
| 19 | +#include <linux/reset.h> |
| 20 | #include <linux/serial_core.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/tty_flip.h> |
| 23 | @@ -1572,8 +1573,17 @@ static void lpuart32_configure(struct lp |
| 24 | static int lpuart32_startup(struct uart_port *port) |
| 25 | { |
| 26 | struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
| 27 | + struct tty_port *tty_port = &sport->port.state->port; |
| 28 | unsigned long flags; |
| 29 | unsigned long temp; |
| 30 | + int ret; |
| 31 | + |
| 32 | + /* some modem may need reset */ |
| 33 | + if (!tty_port_suspended(tty_port)) { |
| 34 | + ret = device_reset(sport->port.dev); |
| 35 | + if (ret && ret != -ENOENT) |
| 36 | + return ret; |
| 37 | + } |
| 38 | |
| 39 | /* determine FIFO size */ |
| 40 | temp = lpuart32_read(&sport->port, UARTFIFO); |