From bd515f5a7babfc1d8470637c49b3c9df87102160 Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Tue, 6 Jun 2017 15:14:42 +0800
Subject: [PATCH] MLK-15031-04 tty: serial: fsl_lpuart: wait baud rate stable

After set the new baud rate, wait some time for the stable.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Robin Gong <yibin.gong@nxp.com>
---
 drivers/tty/serial/fsl_lpuart.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 211155b3ad25..59af53f8c714 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -16,6 +16,7 @@
 
 #include <linux/clk.h>
 #include <linux/console.h>
+#include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmaengine.h>
 #include <linux/dmapool.h>
@@ -1751,6 +1752,9 @@ lpuart32_set_termios(struct uart_port *port, struct ktermios *termios,
 	lpuart32_write(ctrl, sport->port.membase + UARTCTRL);
 
 	spin_unlock_irqrestore(&sport->port.lock, flags);
+
+	/* wait baud rate stable */
+	usleep_range(1000, 2000);
 }
 
 static const char *lpuart_type(struct uart_port *port)
-- 
2.17.1