linux-kernel - Re: [PATCH] platform/x86: intel-wmi-thunderbolt: Add dynamic debugging

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Date:   Wed, 26 Sep 2018 20:10:34 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Mario Limonciello <Mario.Limonciello@...l.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...el.com>
Subject: Re: [PATCH] platform/x86: intel-wmi-thunderbolt: Add dynamic debugging

On Wed, Sep 26, 2018 at 8:03 PM <Mario.Limonciello@...l.com> wrote:
>
> >
> > On Wed, Sep 26, 2018 at 7:11 PM Mario Limonciello
> > <mario.limonciello@...l.com> wrote:
> > >
> > > Some users have been reporting issues with thunderbolt being turned off
> > > before fully initialized.  This is suspected to be caused by userspace
> > > turning off the Thunderbolt controller using intel-wmi-thunderbolt
> > > prematurely.
> > >
> >
> > > Details are available here:
> > > https://bugzilla.kernel.org/show_bug.cgi?id=201227
> > > https://bugzilla.kernel.org/show_bug.cgi?id=199631
> >
> > BugLink: ... ?
> > BugLink: ... ?
> >
> > I can do it myself if you are okay with this format.
> >
> > The patch itself LGTM.
>
> Sure, thank you.

Pushed to my review and testing queue with mentioned changes, thanks!

>
> >
> > >
> > > Userspace has already made some mitigiations for this situation:
> > > https://github.com/hughsie/fwupd/commit/ef6f1d76983c9b66
> > > https://github.com/hughsie/fwupd/commit/c07ce5b4889a5384
> > >
> > > To allow easier debugging of this situation add output that can be turned
> > > on with dynamic debugging to better root cause this problem.
> > >
> > > Suggested-by: Mika Westerberg <mika.westerberg@...el.com>
> > > Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
> > > ---
> > >  drivers/platform/x86/intel-wmi-thunderbolt.c | 6 +++++-
> > >  1 file changed, 5 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/platform/x86/intel-wmi-thunderbolt.c
> > b/drivers/platform/x86/intel-wmi-thunderbolt.c
> > > index c2257bd..ce5fbf0 100644
> > > --- a/drivers/platform/x86/intel-wmi-thunderbolt.c
> > > +++ b/drivers/platform/x86/intel-wmi-thunderbolt.c
> > > @@ -38,12 +38,16 @@ static ssize_t force_power_store(struct device *dev,
> > >         input.length = sizeof(u8);
> > >         input.pointer = &mode;
> > >         mode = hex_to_bin(buf[0]);
> > > +       dev_dbg(dev, "force_power: storing %#x\n", mode);
> > >         if (mode == 0 || mode == 1) {
> > >                 status = wmi_evaluate_method(INTEL_WMI_THUNDERBOLT_GUID, 0, 1,
> > >                                              &input, NULL);
> > > -               if (ACPI_FAILURE(status))
> > > +               if (ACPI_FAILURE(status)) {
> > > +                       dev_dbg(dev, "force_power: failed to evaluate ACPI method\n");
> > >                         return -ENODEV;
> > > +               }
> > >         } else {
> > > +               dev_dbg(dev, "force_power: unsupported mode\n");
> > >                 return -EINVAL;
> > >         }
> > >         return count;
> > > --
> > > 2.7.4
> > >
> >
> >
> > --
> > With Best Regards,
> > Andy Shevchenko



-- 
With Best Regards,
Andy Shevchenko