[Bug 244902] rtwn wlan driver failed to associate on USB3, but succeeds on USB2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244902

            Bug ID: 244902
           Summary: rtwn wlan driver failed to associate on USB3, but
                    succeeds on USB2
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: ruairi.carroll at gmail.com

Created attachment 212519
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212519&action=edit
gzip'd tarball containing all files

Hey,

I have a TP-WN823N V3 USB Wi-Fi adapter connected via USB3.0. This module
refused to work on bare metal, but worked happily when connected to VM for
local testing. After some investigation, it seems that the USB mode affects the
drivers behaviour - USB3.0 controller and the driver loads, but refuses to
associate with the SSID. However switch to a USB2.0 controller, and the driver
behaves correctly. Specifically, the failure scenario here is that the driver
ends up calling r92e_power_off and the module powers off completely, and needs
to be re-seated. 

I setup a test bed, a fresh install of FreeBSD 12.1.

which I've taken with the following enabled:

sysctl hw.usb.ehci.iaadbug=1
sysctl hw.usb.ehci.debug=1
sysctl hw.usb.xhci.debug=1

Attached are two sets of logs;

On successful association: 
- freebsd_syslog_success.txt - /var/log/messages syslog taken with 
- freebsd_cli_success.txt - loading the driver and calling wpa_supplicant(with
timestamp)


On unsuccessful association: 
- freebsd_syslog_failure.txt - /var/log/messages syslog taken with 
- freebsd_cli_failure.txt - loading the driver and calling wpa_supplicant(with
timestamp)


I'm not sure how to further debug this issue, so I could use a little help
please.

/Ruairi

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