[PATCH] watchdog: imx7ulp_wdt: keep already running watchdog enabled

[Guenter Roeck]

On 7/3/24 04:16, Sascha Hauer wrote:
> 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 at pengutronix.de>

Reviewed-by: Guenter Roeck <linux at roeck-us.net>

> ---
>   drivers/watchdog/imx7ulp_wdt.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
> index b21d7a74a42df..94914a22daff7 100644
> --- a/drivers/watchdog/imx7ulp_wdt.c
> +++ b/drivers/watchdog/imx7ulp_wdt.c
> @@ -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);