From 40eb0de5ba7e88e30349f336a38cf22016b8c07f Mon Sep 17 00:00:00 2001
From: Jongpill Lee <boyko.lee@samsung.com>
Date: Wed, 22 Jun 2011 17:50:25 +0900
Subject: [PATCH] tty: s5pv210: Add delay loop on fifo reset function for UART

This patch addes delay loop on fifo reset function for UART.
On high speed freq, it needs delay function when fifo reset.
If not, system will hang by this uart reset problem when resuming
from suspend mode.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/tty/serial/s5pv210.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c
index fb2619f93d8..dce6cb3dbad 100644
--- a/drivers/tty/serial/s5pv210.c
+++ b/drivers/tty/serial/s5pv210.c
@@ -18,6 +18,7 @@
 #include <linux/init.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
+#include <linux/delay.h>
 
 #include <asm/irq.h>
 #include <mach/hardware.h>
@@ -83,6 +84,9 @@ static int s5pv210_serial_resetport(struct uart_port *port,
 	wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
 	wr_regl(port, S3C2410_UFCON, cfg->ufcon);
 
+	/* It is need to delay When reset FIFO register */
+	udelay(1);
+
 	return 0;
 }
 
-- 
2.39.5