From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754044AbbFIQaG (ORCPT ); Tue, 9 Jun 2015 12:30:06 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:35331 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753413AbbFIQ3v (ORCPT ); Tue, 9 Jun 2015 12:29:51 -0400 Message-ID: <5577147B.2030900@codeaurora.org> Date: Tue, 09 Jun 2015 11:29:47 -0500 From: Timur Tabi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 MIME-Version: 1.0 To: Guenter Roeck , Fu Wei CC: Suravee Suthikulpanit , Linaro ACPI Mailman List , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Wei Fu , G Gregory , Al Stone , Hanjun Guo , Ashwin Chaugule , Arnd Bergmann , vgandhi@codeaurora.org, wim@iguana.be, Jon Masters , Leo Duran , Jon Corbet , Mark Rutland , Catalin Marinas , Will Deacon , rjw@rjwysocki.net Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver References: <=fu.wei@linaro.org> <1433217907-928-1-git-send-email-fu.wei@linaro.org> <1433217907-928-6-git-send-email-fu.wei@linaro.org> <556DCC95.806@codeaurora.org> <556DE2D5.3090906@roeck-us.net> <5575DE48.8010308@roeck-us.net> <55766D74.2060401@roeck-us.net> <55769E0E.8060801@roeck-us.net> <557712CF.8010802@roeck-us.net> In-Reply-To: <557712CF.8010802@roeck-us.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Timur Tabi Subject: Re: [PATCH v4 5/7] Watchdog: introduce ARM SBSA watchdog driver Date: Tue, 09 Jun 2015 11:29:47 -0500 Message-ID: <5577147B.2030900@codeaurora.org> References: <=fu.wei@linaro.org> <1433217907-928-1-git-send-email-fu.wei@linaro.org> <1433217907-928-6-git-send-email-fu.wei@linaro.org> <556DCC95.806@codeaurora.org> <556DE2D5.3090906@roeck-us.net> <5575DE48.8010308@roeck-us.net> <55766D74.2060401@roeck-us.net> <55769E0E.8060801@roeck-us.net> <557712CF.8010802@roeck-us.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <557712CF.8010802-0h96xk9xTtrk1uMJSBkQmQ@public.gmane.org> Sender: linux-watchdog-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Guenter Roeck , Fu Wei Cc: Suravee Suthikulpanit , Linaro ACPI Mailman List , linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Wei Fu , G Gregory , Al Stone , Hanjun Guo , Ashwin Chaugule , Arnd Bergmann , vgandhi-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, wim-IQzOog9fTRqzQB+pC5nmwQ@public.gmane.org, Jon Masters , Leo Duran , Jon Corbet , Mark Rutland , Catalin Marinas , Will Deacon , rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org List-Id: devicetree@vger.kernel.org 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. -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html