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Date:   Tue, 30 Apr 2019 11:37:48 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        "Schmauss, Erik" <erik.schmauss@...el.com>
Cc:     mh@...e.franken.de, Lukas Wunner <lukas@...ner.de>,
        Takashi Iwai <tiwai@...e.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>, ckellner@...hat.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Furquan Shaikh <furquan@...gle.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Robert Moore <robert.moore@...el.com>
Subject: Re: [REGRESSION 5.0.8] Dell thunderbolt dock broken (xhci_hcd and thunderbolt)

On Tue, Apr 30, 2019 at 11:00 AM Mika Westerberg
<mika.westerberg@...ux.intel.com> wrote:
>
> +Rafael, Furquan and linux-acpi
>
> (The original thread is here https://lore.kernel.org/lkml/s5hy33siofw.wl-tiwai@suse.de/T/#u)
>
> On Tue, Apr 30, 2019 at 10:39:00AM +0200, Michael Hirmke wrote:
> > Hi Takashi,
> >
> > [...]
> > >>> I also have XPS 9370 but not that particular dock. I will check tomorrow
> > >>> if I can reproduce it as well.
> > >>
> > >> There aren't too many changes between 5.0.7 and 5.0.8 that touch
> > >> PCI/ACPI. This is just a shot in the dark but could you try to revert:
> > >>
> > >>   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi
> > >>   t/commit/?h=linux-5.0.y&id=da6a87fb0ad43ae811519d2e0aa325c7f792b13a
> > >>
> > >> and see if it makes any difference?
> >
> > >OK, I'm building a test kernel package with the revert in OBS
> > >home:tiwai:bsc1133486 repo.  A new kernel will be
> > >kernel-default-5.0.10-*g8edeab8:
> > >  http://download.opensuse.org/repositories/home:/tiwai:/bsc1133486/standard/
> >
> > >Michael, once when the new kernel is ready, please give it a try.
> >
> > as far as I can see, state is back to normal with this kernel.
> > No more error messages or crashing modules and all devices seem to work
> > as expected.
> > Only thing is, that the external devices connected to the Thunderbolt
> > dock are coming up a little bit slower than with 5.0.7 - but this is
> > nothing, I'd worry about.
>
> Thanks for testing.
>
> Rafael, it seems that commit c8b1917c8987 ("ACPICA: Clear status of GPEs
> before enabling them") causes problem with Thunderbolt controllers if
> you boot with device (dock) connected.
>
> I think the reason is the same that got fixed in v4.14 with commit
> ecc1165b8b74 ("ACPICA: Dispatch active GPEs at init time") which the
> above commit essentially undoes if I understand it correctly.

OK, I'll queue up a revert of that one then, thanks!

Erik, I think that commit c8b1917c8987 has been picked up by the
upstream ACPICA already.  If I'm not mistaken, it needs to be reverted
from there as well.

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