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tty: s5pv210: Add delay loop on fifo reset function for UART

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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>
This commit is contained in:
Jongpill Lee 2011-06-22 17:50:25 +09:00 committed by Greg Kroah-Hartman
parent 5568181f18
commit 40eb0de5ba
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/s5pv210.c
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@ -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;
}