[Bug 219748] Pluggable UD-4VPD dock appears to continually reset with AMD AI 365

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219748

--- Comment #16 from Mika Westerberg (mika.westerberg@linux.intel.com) ---
Thanks! So we have:

[   56.773330] thunderbolt 0000:c6:00.6: 0:3: hotplug: scanning
[   56.773335] thunderbolt 0000:c6:00.6: 0:3: hotplug: no switch found
[   56.773349] thunderbolt 0000:c6:00.6: acking hot plug event on 0:2
[   56.773362] thunderbolt 0000:c6:00.6: 0:2: hotplug: scanning
[   56.773504] thunderbolt 0000:c6:00.6: 0:2: is connected, link is up (state:
2)
[   56.773515] thunderbolt 0000:c6:00.6: 0:2: waiting for a while
[   57.371077] thunderbolt 0000:c6:00.6: acking hot unplug event on 0:3
[   57.371143] thunderbolt 0000:c6:00.6: acking hot unplug event on 0:2
[   57.692761] thunderbolt 0000:c6:00.6: acking hot plug event on 0:3
[   57.692828] thunderbolt 0000:c6:00.6: acking hot plug event on 0:2
[   58.291125] thunderbolt 0000:c6:00.6: acking hot unplug event on 0:2
[   58.291217] thunderbolt 0000:c6:00.6: acking hot unplug event on 0:3
[   59.430462] thunderbolt 0000:c6:00.6: 0:2: .. done, trying to enumerate the
router

In other words there is some ~600ms timeout in the pluggable device that
triggers hot-remove and then hot-add if the device is not enumerated. This is
naturally the USB4 spec, as far as I can tell the host does not need to
enumerate the device at all actually.

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