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From 5f1a35c3f5c17cc6229873248a56784fcd03db1c Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Fri, 27 Sep 2019 15:18:41 +0800
Subject: [PATCH] serial: fsl_lpuart: enable two stop bits
Add two stop bits support.
User can run the command to enable two stop bits
for test: stty cstopb -F /dev/ttyLPx
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -2111,11 +2111,12 @@ lpuart32_set_termios(struct uart_port *p
{
struct lpuart_port *sport = container_of(port, struct lpuart_port, port);
unsigned long flags;
- unsigned long ctrl, old_ctrl, modem;
+ unsigned long ctrl, old_ctrl, bd, modem;
unsigned int baud;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
ctrl = old_ctrl = lpuart32_read(&sport->port, UARTCTRL);
+ bd = lpuart32_read(&sport->port, UARTBAUD);
modem = lpuart32_read(&sport->port, UARTMODIR);
/*
* only support CS8 and CS7, and for CS7 must enable PE.
@@ -2152,7 +2153,9 @@ lpuart32_set_termios(struct uart_port *p
}
if (termios->c_cflag & CSTOPB)
- termios->c_cflag &= ~CSTOPB;
+ bd |= UARTBAUD_SBNS;
+ else
+ bd &= ~UARTBAUD_SBNS;
/* parity must be enabled when CS7 to match 8-bits format */
if ((termios->c_cflag & CSIZE) == CS7)
@@ -2222,6 +2225,7 @@ lpuart32_set_termios(struct uart_port *p
lpuart32_write(&sport->port, old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE),
UARTCTRL);
+ lpuart32_write(&sport->port, bd, UARTBAUD);
lpuart32_serial_setbrg(sport, baud);
lpuart32_write(&sport->port, modem, UARTMODIR);
lpuart32_write(&sport->port, ctrl, UARTCTRL);
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