[Bug 206901] Valve Index HMD breaks the USB controller it's connected into

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206901

--- Comment #2 from Carlo Wood (carlo@alinoe.com) ---
I had a LOT more problems with the USB 3 on my ASUS Sabertooth 990FX
motherboard, so I bought a PCI Express card (PEXUSB3S44V from Startech, see
https://www.startech.com/nl/en/Cards-Adapters/USB-3.0/Cards/PCI-Express-USB-3-Card-4-Dedicated-Channels-4-Port~PEXUSB3S44V)
basically because it is the most expensive card you can get (I was hoping to
rule out certain things with that).

As a result I no longer needed to disable iommu in the BIOS or pass iommu=soft
as kernel boot parameter. But the above bug remained (although less
frequently).

The PEXUSB3S44V uses the μPD720202 host controller chip (four of them I think).
Documents here
https://www.renesas.com/us/en/products/usb-assp/upd720202.html#documents

This bug has the feel of https://bugzilla.kernel.org/show_bug.cgi?id=65021
from 2013 (kernel 3.x). A patch that has been in the kernel for long related
to that bug is https://www.spinics.net/lists/linux-usb/msg122678.html a few
people said was fixing the issue for them.

However, I added debug output to the module and in my case it never even gets
to the line

> xhci->quirks |= XHCI_AVOID_BEI;

so no wonder that patch didn't solve it for me ;).
Hence, apparently pdev->vendor != PCI_VENDOR_ID_INTEL for me.

But maybe it should be? The μPD720202 specs say it is Intel compatible...

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