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

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Date:   Tue, 09 Jan 2018 19:30:09 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     Guenter Roeck <linux@...ck-us.net>
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

Oh fantastic! this works awesome, thank you ♥

On Tue, 2018-01-09 at 16:11 -0800, Guenter Roeck wrote:
> 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
-- 
Cheers,
	Lyude Paul