linux-kernel - Re: [11/12] watchdog: sp5100-tco: Abort if watchdog is disabled by hardware

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Date:   Tue, 9 Jan 2018 16:11:25 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Lyude Paul <lyude@...hat.com>
Cc:     Wim Van Sebroeck <wim@...ana.be>, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Zoltán Böszörményi <zboszor@...hu>
Subject: Re: [11/12] watchdog: sp5100-tco: Abort if watchdog is disabled by
 hardware

On Tue, Jan 09, 2018 at 07:04:25PM -0500, Lyude Paul wrote:
> How exactly did you go about enabling the Super-IO watchdog on your MSI board?
>  This is an MSI A320M that I'm trying to make work here
> 

MSI boards use NCT679x Super-IO chips. The watchdog on those chips is supported
by the w83627hf_wdt driver (since v4.13). If you have an older kernel, the
relevant commit is 3a9aedb282a ("watchdog: w83627hf: Add support for NCT6793D
and NCT6795D").

Guenter

> On Tue, 2018-01-09 at 15:37 -0800, Guenter Roeck wrote:
> > Hi,
> > 
> > On Tue, Jan 09, 2018 at 05:58:07PM -0500, Lyude Paul wrote:
> > > Hi! I'm the one from the Fedora bugzilla who said they'd help review these
> > > patches. I might end up responding to this with a real review comment
> > > after
> > > this message, but first:
> > > 
> > > mind cc'ing me future versions of this patchset and also, is there any way
> > > you
> > 
> > Sure.
> > 
> > > know of that one could figure out whether or not the sp5100_tco wdt is
> > > actually disabled by the OEM on a board? I tried testing these patches
> > > with my
> > 
> > That is what the code is trying to do today.
> > 
> > > system and it appears to be convinced that it's disabled on my system, but
> > > I'm
> > > hoping something in this patch is just broken…
> > > 
> > 
> > I tested the driver on three different boards. MSI B350M MORTAR,
> > MSI B350 TOMAHAWK, and Gigabyte AB350M-Gaming 3. CPU is Ryzen 1700X
> > on all boards.
> > 
> > On the MSI boards, the watchdog is reported as disabled. Enabling it
> > and letting it expire does not have an effect. I am using the Super-IO
> > watchdog instead on those boards (and it works).
> > 
> > On the Gigabyte board, the watchdog is reported as enabled, and it works
> > (and the watchdog on the Super-IO chips does not work).
> > 
> > Feel free to play with the driver. Maybe there is a means to enable the
> > watchdog if it is disabled. Unfortunately, I was unable to figure out how
> > to do it, so I thought it is better to report the fact and not instantiate
> > the watchdog if it doesn't work.
> > 
> > Hope this helps,
> > Guenter
> -- 
> Cheers,
> 	Lyude Paul