[Bug 220904] [BUG] ucsi_acpi: USB 3.0 SuperSpeed not negotiated on USB-C hot-plug

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220904

--- Comment #11 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
The usb device at 2-3 is set to U3 suspended state before the xhci host at
0000:00:0d.0 suspends to D3cold. 

xHCI host controller is then reset and reinitialized during resume.
This should only be done during restore phase (resume from s4 hibernate) or if
there an error in resume. Not in normal s2idle resume. 
Logs don't show any error during resume.

This host controller reset may trigger a warm port reset on USB3 ports.
The device at 2-3 is probably unaware of the host controller reset, and
remains in suspended u3 state until a warm reset is suddenly issued.

Right after we get the host re-initialuzed and up and running we read the port
status registers, and see that port 2-3 is stuck with "reset asserted" bit set,
and remain this way.

First we should figure out why host is reset during resumed for a normal s2idle
suspend/resume.
If the host reset is needed theb we might need to work around this and try
disabling/power off ports before resetting the host in resume.

would it be possible for you to try some testpatches on this setup if I write
them?

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