Re: Misbehaving Alder Lake-N PCH USB 3.2 xHCI Host Controller

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What is the last digit of your HCSPARAMS2 register?
Here's my three hosts, guess which is the one with problems.

grep HCSPARAMS2 /sys/kernel/debug/usb/xhci/*/reg-cap
/sys/kernel/debug/usb/xhci/0000:02:00.0/reg-cap:HCSPARAMS2 = 0xfc0000fa
/sys/kernel/debug/usb/xhci/0000:03:00.0/reg-cap:HCSPARAMS2 = 0xfc000031
/sys/kernel/debug/usb/xhci/0000:04:00.0/reg-cap:HCSPARAMS2 = 0x00000011

See xHCI section 5.3.4. If IST is high, you are probably out of luck.
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