From 5b05462e88dc87d83566d04dd196b4f3d9dc0eef Mon Sep 17 00:00:00 2001 From: Fugang Duan 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 --- 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 #include #include +#include #include #include #include @@ -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);