Re: [REGRESSION 5.0.8] Dell thunderbolt dock broken (xhci_hcd and thunderbolt)

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Tue, Apr 30, 2019 at 11:37:48AM +0200, Rafael J. Wysocki wrote:
> On Tue, Apr 30, 2019 at 11:00 AM Mika Westerberg
> <mika.westerberg@linux.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.

I've queued the revert up in the stable trees as it has hit Linus's tree
now, and will push out a new round of stable kernels soon.

thanks,

greg k-h