[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

--- Comment #4 from Mathias Nyman (mathias.nyman@linux.intel.com) ---
(In reply to Mr. Beedell, Roke Julian Lockhart (RJLB) from comment #3)
> (In reply to Mathias Nyman from comment #2)
> 
> > Or does this xHC host have 0 ports on usb2 roothub as well?
> 
> I dare say that I'm operating at the boundaries of my lay man's knowledge as
> it is. How do you suggest that I ascertain this?

Probably best to take a closer at the xHC port information of this host

The reg-ext-protocol:00 and reg-ext-protocol:01 files in debugfs should show
all info about the ports the host provides:

Example, this machine has only one xHC at PCI address 0000:00:14.0:

cat /sys/kernel/debug/usb/xhci/0000:00:14.0/reg-ext-protocol*
EXTCAP_REVISION = 0x02000802
EXTCAP_NAME = 0x20425355
EXTCAP_PORTINFO = 0x30010e01
EXTCAP_PORTTYPE = 0x00000000
EXTCAP_MANTISSA1 = 0x000c0021
EXTCAP_MANTISSA2 = 0x05dc0012
EXTCAP_MANTISSA3 = 0x01e00023

EXTCAP_REVISION = 0x03000802
EXTCAP_NAME = 0x20425355
EXTCAP_PORTINFO = 0x10000610
EXTCAP_PORTTYPE = 0x00000000
EXTCAP_MANTISSA1 = 0x00050134


Above shows:
EXTCAP_REVISION tells if ports are USB3 or USB2,
EXTCAP_PORTNINFO = 0x****AA**, where AA tells us how many ports

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