linux-kernel - Re: [PATCH v3 2/2] watchdog: dw_wdt: Try to get a 30 second watchdog by default

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Message-ID: <20150203190232.GE2875@spo001.leaseweb.nl>
Date:	Tue, 3 Feb 2015 20:02:33 +0100
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Heiko Stuebner <heiko@...ech.de>,
	Lunxue Dai <lunxue.dai@...k-chips.com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Dinh Nguyen <dinguyen@...era.com>,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] watchdog: dw_wdt: Try to get a 30 second watchdog by default

Hi Doug,

> The dw_wdt_set_top() function takes in a value in seconds.  In
> dw_wdt_open() we were calling it with a value that's supposed to
> represent the maximum value programmed into the "top" register with a
> comment saying that we were trying to set the watchdog to its maximum
> value.  Instead we ended up setting the watchdog to ~15 seconds.
> 
> Let's fix this.  However, setting things to the "max" gives me an 86
> second watchdog in the system I'm looking at.  86 seconds feels a
> little too long.  We'll explicitly choose 30 seconds as a more
> reasonable value.
> 
> NOTE: Ideally this driver should be transitioned to be a real watchdog
> driver.  Then we could use "watchdog_init_timeout" and let the timeout
> be specified in a number of ways (device tree, module parameter, etc).
> This patch should be considered a bit of a stopgap solution.
> 
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

This one has also been added to linux-watchdog-next.

Kind regards,
Wim.

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