linux-kernel - Re: [PATCH 01/10] watchdog: keembay: Update WDT pre-timeout during the initialization

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Date:   Wed, 12 May 2021 06:58:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     shruthi.sanil@...el.com
Cc:     wim@...ux-watchdog.org, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org, andriy.shevchenko@...ux.intel.com,
        kris.pan@...ux.intel.com, mgross@...ux.intel.com,
        srikanth.thokala@...el.com, lakshmi.bai.raja.subramanian@...el.com,
        mallikarjunappa.sangannavar@...el.com
Subject: Re: [PATCH 01/10] watchdog: keembay: Update WDT pre-timeout during
 the initialization

On Wed, May 12, 2021 at 02:17:15PM +0530, shruthi.sanil@...el.com wrote:
> From: Shruthi Sanil <shruthi.sanil@...el.com>
> 
> The pretimeout register has a default reset value. Hence
> when a smaller WDT timeout is set which would be lesser than the
> default pretimeout, the system behaves abnormally, starts
> triggering the pretimeout interrupt even when the WDT is
> not enabled, most of the times leading to system crash.
> Hence an update in the pre-timeout is also required for the
> default timeout that is being configured.
> 
> Fixes: fa0f8d51e90d ("watchdog: Add watchdog driver for Intel Keembay Soc")
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Tested-by: Kris Pan <kris.pan@...el.com>
> Signed-off-by: Shruthi Sanil <shruthi.sanil@...el.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/watchdog/keembay_wdt.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/watchdog/keembay_wdt.c b/drivers/watchdog/keembay_wdt.c
> index 547d3fea33ff..f2f5c9fae29c 100644
> --- a/drivers/watchdog/keembay_wdt.c
> +++ b/drivers/watchdog/keembay_wdt.c
> @@ -29,6 +29,7 @@
>  #define WDT_LOAD_MAX		U32_MAX
>  #define WDT_LOAD_MIN		1
>  #define WDT_TIMEOUT		5
> +#define WDT_PRETIMEOUT		4
>  
>  static unsigned int timeout = WDT_TIMEOUT;
>  module_param(timeout, int, 0);
> @@ -224,11 +225,13 @@ static int keembay_wdt_probe(struct platform_device *pdev)
>  	wdt->wdd.min_timeout	= WDT_LOAD_MIN;
>  	wdt->wdd.max_timeout	= WDT_LOAD_MAX / wdt->rate;
>  	wdt->wdd.timeout	= WDT_TIMEOUT;
> +	wdt->wdd.pretimeout	= WDT_PRETIMEOUT;
>  
>  	watchdog_set_drvdata(&wdt->wdd, wdt);
>  	watchdog_set_nowayout(&wdt->wdd, nowayout);
>  	watchdog_init_timeout(&wdt->wdd, timeout, dev);
>  	keembay_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);
> +	keembay_wdt_set_pretimeout(&wdt->wdd, wdt->wdd.pretimeout);
>  
>  	ret = devm_watchdog_register_device(dev, &wdt->wdd);
>  	if (ret)
> -- 
> 2.17.1
>