On Tue, Nov 05, 2024 at 10:50:17AM +0100, Greg KH wrote:
> On Tue, Nov 05, 2024 at 11:24:12AM +0200, Mika Westerberg wrote:
> > Hi Greg,
> >
> > On Tue, Nov 05, 2024 at 10:17:43AM +0100, Greg KH wrote:
> > > On Tue, Nov 05, 2024 at 10:53:01AM +0200, Mika Westerberg wrote:
> > > > Rick reported that his Pluggable USB4 dock does not work anymore after
> > > > 6.6.28 kernel.
> > > >
> > > > It looks like commit c6ca1ac9f472 ("thunderbolt: Increase sideband
> > > > access polling delay") makes the device router enumeration happen later
> > > > than what might be expected by the dock (although there is no such limit
> > > > in the USB4 spec) which probably makes it assume there is something
> > > > wrong with the high-speed link and reset it. After the link is reset the
> > > > same issue happens again and again.
> > > >
> > > > For this reason lower the sideband access delay from 5ms to 1ms. This
> > > > seems to work fine according to Rick's testing.
> > > >
> > > > Reported-by: Rick Lahaye <rick@xxxxxxxxxx>
> > > > Closes: https://lore.kernel.org/linux-usb/000f01db247b$d10e1520$732a3f60$@581238.xyz/
> > > > Tested-by: Rick Lahaye <rick@xxxxxxxxxx>
> > > > Fixes: c6ca1ac9f472 ("thunderbolt: Increase sideband access polling delay")
> > >
> > > This commit is not in the 6.6.y tree, it only showed up in 6.10.y, so
> > > how does this resolve an issue in the 6.6.y tree?
> >
> > This refers to a mainline commit that caused the issue. The 6.6.28 is
> > the kernel version Rick used where it still worked. In other words, this
> > is not a backport of a fix but a fix intented to the mainline ;-) I hope
> > this clarifies. I can adjust the commit message if needed.
>
> Ah, yeah, that is confusing so rewording it might be good as the
> offending kernel is really 6.10, not 6.6.
Okay will do!
> Also, do you want me to take this in my tree now when you resend it, or
> do you want to send it with other changes later?
I'll send it along with one more fix later this week if that's fine.
