[Bug 208891] Thunderbolt hotplug fails on HP x360 13t-aw000/86FA with HP Thunderbolt 3 Dock

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=208891

--- Comment #22 from Matt Turner (mattst88@gmail.com) ---
(In reply to Mika Westerberg from comment #21)
> Thanks for the logs. For some reason the two downstream PCIe ports (2d:00.0
> and 2d:01.0) that lead to the xHCI and the NIC get their bridge windows
> reset to 0 and this prevents drivers from accessing their MMIO registers. I
> also see that you are not running the mainline kernel so can you take v5.8
> vanilla kernel and try that and add "pcie_port_pm=off" to the kernel command
> line to disable runtime PM of those ports.

Tried with v5.8.1. Was previously using 5.8.0-rc7-next-20200729 because I
expected to be asked to test linux-next.

Anyway, pcie_port_pm=off didn't help. Neither did pcie_ports=native.

I also tried adding

+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,  0x1578, quirk_no_bus_reset);

to drivers/pci/quirks.c on a whim because of something I saw in a google
search, but of course that didn't help either.

Is the fact that it works if I attach the dock and then boot the system not
indicative of something? Is the BIOS/EFI setup tasked with programming some
stuff that the thunderbolt driver might be failing to do so?

I just noticed something odd. Coldplugged with the dock working, I can suspend
and resume and it will continue working. But if I unplug and replug the dock
while the system is suspended, it fails to work after resume.

Doesn't that indicate that the thunderbolt firmware is doing something wrong?

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