Re: nouveau regression with 5.7 caused by "PCI/PM: Assume ports without DLL Link Active train links in 100 ms"

[Mika Westerberg]

On Fri, Jul 17, 2020 at 09:52:09PM +0200, Lukas Wunner wrote:
> On Fri, Jul 17, 2020 at 03:04:10PM -0400, Lyude Paul wrote:
> > Isn't it possible to tell whether a PCI device is connected through
> > thunderbolt or not? We could probably get away with just defaulting
> > to 100ms for thunderbolt devices without DLL Link Active specified,
> > and then default to the old delay value for non-thunderbolt devices.
> 
> pci_is_thunderbolt_attached()

That only works with some devices. I think we should try to keep the
fact that some PCIe links may be tunneled over TBT/USB4 transparent to
the PCI core and try to treat them as "standard" PCIe links if possible
at all :)