[Bug 220181] Users across distributions see “config failed, hub doesn’t have any ports! (err -19)” from xhci_hcd at boot.

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220181

Mr. Beedell, Roke Julian Lockhart (RJLB) (6svcyk03@rokejulianlockhart.addy.io) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|                            |https://koji.fedoraproject.
                   |                            |org/koji/rpminfo?rpmID=4290
                   |                            |0892

--- Comment #5 from Mr. Beedell, Roke Julian Lockhart (RJLB) (6svcyk03@rokejulianlockhart.addy.io) ---
"`sudo ls /sys/kernel/debug/usb/xhci/`" returns "`0000:5a:00.0`":

```
0000:08:00.0  0000:54:00.0  0000:56:00.0  0000:59:00.3  0000:59:00.4 
0000:5a:00.0
```

...so I tried the problematic port (and a random alternative):

```
#!/usr/bin/env sh
sudo cat /sys/kernel/debug/usb/xhci/0000:08:00.0/reg-ext-protocol:00
sudo cat /sys/kernel/debug/usb/xhci/0000:08:00.0/reg-ext-protocol:01
```

For the problematic port, solely the first command returns:

```
EXTCAP_REVISION = 0x02000402
EXTCAP_NAME = 0x20425355
EXTCAP_PORTINFO = 0x00180101
EXTCAP_PORTTYPE = 0x00000000
```

For the second command, the file supposedly doesn't exist:

> cat: '/sys/kernel/debug/usb/xhci/0000:5a:00.0/reg-ext-protocol:01': No such file or directory

This somewhat perplexes me, considering that the random alternative at "`sudo
cat /sys/kernel/debug/usb/xhci/0000:08:00.0/reg-ext-protocol:01`" quite happily
works:

```
EXTCAP_REVISION = 0x03101402
EXTCAP_NAME = 0x20425355
EXTCAP_PORTINFO = 0x80000203
EXTCAP_PORTTYPE = 0x00000000
EXTCAP_MANTISSA1 = 0x00050134
EXTCAP_MANTISSA2 = 0x000a4135
EXTCAP_MANTISSA3 = 0x04e00126
EXTCAP_MANTISSA4 = 0x09c00127
EXTCAP_MANTISSA5 = 0x13800128
EXTCAP_MANTISSA6 = 0x05b10129
```

At least, this appears to demonstrate that one port exists, although apologies
if I've misunderstood. For reference, I'm using
`kernel-6.14.9-300.fc42.x86_64`.

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