linux-kernel - Re: [PATCH v3 5/6] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <55687D9A.8080409@roeck-us.net>
Date:	Fri, 29 May 2015 07:54:18 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Fu Wei <fu.wei@...aro.org>
CC:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	Wei Fu <tekkamanninja@...il.com>,
	G Gregory <graeme.gregory@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, vgandhi@...eaurora.org,
	wim@...ana.be, Jon Masters <jcm@...hat.com>,
	Leo Duran <leo.duran@....com>, Jon Corbet <corbet@....net>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v3 5/6] Watchdog: introduce ARM SBSA watchdog driver

On 05/29/2015 02:11 AM, Fu Wei wrote:
[ ... ]

>>> +
>>> +       status = sbsa_gwdt_cf_read(SBSA_GWDT_WCS, wdd);
>>> +       if (status & SBSA_GWDT_WCS_WS1) {
>>> +               dev_warn(dev, "System reset by WDT(WCS: %x, WCV: %llx)\n",
>>> +                        status, sbsa_gwdt_get_wcv(wdd));
>>
>>
>> Does this message (specifically the WCS / WCV values) have any
>> useful meaning for the user ?
>
> I think so, according to SBSA spec:
> If WS0 is asserted and a timeout refresh occurs then the following must occur:
>      If the system is compliant to SBSA level 2 or higher the compare
> value must retain its current value. This means that the compare value
> records the time that WS1 is asserted.
>
> So, I think WCV can log the time when system reset by WDT, that may
> help user figure out the problem. but WCS can be delete I think.
>

How would that help ? It is just a number with no reference to anything.

Thanks,
Guenter

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