On Tue, Sep 23, 2014 at 03:42:11PM +0800, Jisheng Zhang wrote: > The TOP_INIT, ie bit 4-7 of the WDOG_TIMEOUT_RANGE_REG_OFFSET register > may be zero, so the timeout period may be very short after initialization > is done, thus the system may be reset soon after enabling. We fix this > problem by also initialising the TOP_INIT when setting TOP in function > dw_wdt_set_top(). > > Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxxx> That should do it. Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx> > --- > drivers/watchdog/dw_wdt.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c > index 9f21029..449c885 100644 > --- a/drivers/watchdog/dw_wdt.c > +++ b/drivers/watchdog/dw_wdt.c > @@ -40,6 +40,7 @@ > #define WDOG_CONTROL_REG_OFFSET 0x00 > #define WDOG_CONTROL_REG_WDT_EN_MASK 0x01 > #define WDOG_TIMEOUT_RANGE_REG_OFFSET 0x04 > +#define WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT 4 > #define WDOG_CURRENT_COUNT_REG_OFFSET 0x08 > #define WDOG_COUNTER_RESTART_REG_OFFSET 0x0c > #define WDOG_COUNTER_RESTART_KICK_VALUE 0x76 > @@ -106,7 +107,8 @@ static int dw_wdt_set_top(unsigned top_s) > } > > /* Set the new value in the watchdog. */ > - writel(top_val, dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); > + writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT, > + dw_wdt.regs + WDOG_TIMEOUT_RANGE_REG_OFFSET); > > dw_wdt_set_next_heartbeat(); > > -- > 2.1.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html