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watchdog: make DesignWare watchdog allow users to set bigger timeout value 

watchdog_dev.c provides means to allow users to set bigger timeout value
than HW can support, make DesignWare watchdog align with this.

Signed-off-by: Peng Wang <peng.1.wang@nokia-sbell.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/8fa54e92c6cd4544a7a3eb60a373ac43@nokia-sbell.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
alistair/sensors
Wang, Peng 1. (NSB - CN/Hangzhou) 2019-11-25 02:04:13 +00:00 committed by Wim Van Sebroeck
parent 85fdc63fe2
commit d4ba76d798
1 changed files with 9 additions and 1 deletions
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10
drivers/watchdog/dw_wdt.c
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@ -114,7 +114,15 @@ static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
/*
* In case users set bigger timeout value than HW can support,
* kernel(watchdog_dev.c) helps to feed watchdog before
* wdd->max_hw_heartbeat_ms
*/
if (top_s * 1000 <= wdd->max_hw_heartbeat_ms)
wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
else
wdd->timeout = top_s;
return 0;
}