linux-kernel - Re: [PATCH v2 2/4] mfd: lpc_ich: Do not create iTCO watchdog when WDAT table exists

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Date:   Wed, 28 Sep 2016 00:07:49 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Wim Van Sebroeck <wim@...ana.be>,
        Guenter Roeck <linux@...ck-us.net>,
        Len Brown <lenb@...nel.org>, Jean Delvare <jdelvare@...e.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Peter Tyser <ptyser@...-inc.com>,
        Zha Qipeng <qipeng.zha@...el.com>,
        Darren Hart <dvhart@...radead.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] mfd: lpc_ich: Do not create iTCO watchdog when WDAT table exists

On Tuesday, September 27, 2016 08:41:14 PM Lee Jones wrote:
> On Tue, 20 Sep 2016, Mika Westerberg wrote:
> 
> > ACPI WDAT table is the preferred way to use hardware watchdog over the
> > native iTCO_wdt. Windows only uses this table for its hardware watchdog
> > implementation so we should be relatively safe to trust it has been
> > validated by OEMs
> > 
> > Prevent iTCO watchdog creation if we detect that there is ACPI WDAT table.
> > 
> > Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> > Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> >  drivers/mfd/lpc_ich.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> 
> Applied, thanks.

Well, I applied this too.

And it depends on the [1/4], doesn't it?

> 
> > diff --git a/drivers/mfd/lpc_ich.c b/drivers/mfd/lpc_ich.c
> > index bd3aa4578346..c8dee47b45d9 100644
> > --- a/drivers/mfd/lpc_ich.c
> > +++ b/drivers/mfd/lpc_ich.c
> > @@ -984,6 +984,10 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
> >  	int ret;
> >  	struct resource *res;
> >  
> > +	/* If we have ACPI based watchdog use that instead */
> > +	if (acpi_has_watchdog())
> > +		return -ENODEV;
> > +
> >  	/* Setup power management base register */
> >  	pci_read_config_dword(dev, priv->abase, &base_addr_cfg);
> >  	base_addr = base_addr_cfg & 0x0000ff80;
> 
> 

Thanks,
Rafael