Commit 40eb0de5 authored Jun 22, 2011 by Jongpill Lee Committed by Greg Kroah-Hartman Jul 01, 2011

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>

parent 5568181f

drivers/tty/serial/s5pv210.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}