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watchdog/imx_watchdog: do not set WCR_WDW

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with WCR_WDW set, the watchdog won't trigger if we bootet linux and idle
around while the watchdog is not triggered. It seems the timer makes
progress very slowly if at all. I managed to remain 20minutes alive
while the timeout was set to 60secs. It reboots within 60secs if I start
a busyloop in userland (something like "while (1) { }").

While I don't see a reason why the WDT should not be running while the
CPU is in idle, I'm dropping this bit.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Sebastian Siewior 2015-03-03 17:45:43 +01:00 committed by Stefano Babic
parent 27d3608076
commit 5cab874052
1 changed files with 1 additions and 2 deletions
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3
drivers/watchdog/imx_watchdog.c
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@ -20,7 +20,6 @@ struct watchdog_regs {
#define WCR_WDE 0x04 /* WDOG enable */
#define WCR_WDT 0x08
#define WCR_SRS 0x10
#define WCR_WDW 0x80
#define SET_WCR_WT(x) (x << 8)
#ifdef CONFIG_IMX_WATCHDOG
@ -47,7 +46,7 @@ void hw_watchdog_init(void)
#endif
timeout = (CONFIG_WATCHDOG_TIMEOUT_MSECS / 500) - 1;
writew(WCR_WDZST | WCR_WDBG | WCR_WDE | WCR_WDT | WCR_SRS |
WCR_WDW | SET_WCR_WT(timeout), &wdog->wcr);
SET_WCR_WT(timeout), &wdog->wcr);
hw_watchdog_reset();
}
#endif