linux-kernel - Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

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Message-ID: <5577147B.2030900@codeaurora.org>
Date:	Tue, 09 Jun 2015 11:29:47 -0500
From:	Timur Tabi <timur@...eaurora.org>
To:	Guenter Roeck <linux@...ck-us.net>, 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>,
	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>, rjw@...ysocki.net
Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver

On 06/09/2015 11:22 AM, Guenter Roeck wrote:
>
>
> but I see your point. Essentially, the specification is broken
> for all practical purposes, since, as you point out, enabling
> the watchdog overwrites and explicitly sets WCV. Effectively
> this means that just using WCV to program the timeout period
> is not really possible.
>
> I am not really sure how to address this. We can either only use WOR,
> and forget about pretimeout, or we can enforce a minimum pretimeout.
> In the latter case, we'll have to write WCV after writing WOR.

In talking with our hardware engineers, using WCV to program the timeout 
period is not a valid operation.  This is why I keep arguing against the 
pre-timeout feature, and I don't agree that servers should always use 
pre-timeout.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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