From: Jongpill Lee <boyko.lee@xxxxxxxxxxx> 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@xxxxxxxxxxx> Signed-off-by: Jaecheol Lee <jc.lee@xxxxxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxx> Signed-off-by: Kukjin Kim <kgene.kim@xxxxxxxxxxx> --- drivers/tty/serial/s5pv210.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/tty/serial/s5pv210.c b/drivers/tty/serial/s5pv210.c index fb2619f..dce6cb3 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; } -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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