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watchdog: imx7ulp_wdt: keep already running watchdog enabled

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When the bootloader enabled the watchdog before Kernel started then
keep it enabled during initialization. Otherwise the time between
the watchdog probing and the userspace taking over the watchdog
won't be covered by the watchdog. When keeping the watchdog enabled
inform the Kernel about this by setting the WDOG_HW_RUNNING so that
the periodic watchdog feeder is started when desired.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240703111603.1096424-1-s.hauer@pengutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Sascha Hauer 2024-07-03 13:16:03 +02:00 committed by Wim Van Sebroeck
parent 9dca7a0ae5
commit b771d14f41
1 changed files with 5 additions and 0 deletions
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5
drivers/watchdog/imx7ulp_wdt.c
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@ -290,6 +290,11 @@ static int imx7ulp_wdt_init(struct imx7ulp_wdt_device *wdt, unsigned int timeout
if (wdt->ext_reset)
val |= WDOG_CS_INT_EN;
if (readl(wdt->base + WDOG_CS) & WDOG_CS_EN) {
set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
val |= WDOG_CS_EN;
}
do {
ret = _imx7ulp_wdt_init(wdt, timeout, val);
toval = readl(wdt->base + WDOG_TOVAL);