[Bug 216766] USB enumeration lockup

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216766

Mathias Nyman (mathias.nyman@linux.intel.com) changed:

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                 CC|                            |mathias.nyman@linux.intel.c
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--- Comment #5 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
This could also be related to USB Type-C port setting in resume.

I'm guessing this dock uses DP Alt-mode, with both Display port
and USB 3 over Type-C.

In both resume cases there are some error related to the display:

[drm:dm_late_init [amdgpu]] *ERROR* DM_MST: Failed to start MST
[drm:amdgpu_device_ip_late_init [amdgpu]] *ERROR* late_init of IP block <dm>
failed -5

After this all usb devices on usb4 and usb5 buses disconnect (xHCI
0000:06:00.3:)
There are no xhci errors in the log, just disconnects, as if Type-C port was
muxed away from xHCI.

A bit later we see DP Alt mode entry after first resume, and usb devices are
enumerated again.
[  136.881649] [drm] DP Alt mode state on HPD: 1
[  137.153415] [drm] DM_MST: starting TM on aconnector: 00000000018c53ab [id:
89]

After second resume we don't se this DP Alt mode entry in the log, and usb
devices remain disconnected.

Not that familiar with Type-C settings, could be AMD specific

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