[FS#497] ipq806x: non-working USB 3.0 port on R7500 / Netgear X4 nighthawk

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Thomas Reifferscheid (reiffert) 

Attached to Project - LEDE Project
Summary - ipq806x: non-working USB 3.0 port on R7500 / Netgear X4 nighthawk
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - All
Due in Version - Undecided
Due Date - Undecided
Details - Device problem occurs on all lede versions. It's known to be working with the stock linux kernel-3.4.104
The 2nd USB 3.0 port is not working at all and you can read from dmesg as follows:


[   74.689113] usb usb2-port1: connect-debounce failed

Instead connecting a USB 2. drive to USB port 2:
[  162.744896] usb usb2-port1: connect-debounce failed

Connecting it again:
[ 3867.976984] xhci-hcd xhci-hcd.0.auto: Cannot set link state.
[ 3867.977104] usb usb2-port1: cannot disable (err = -32)   

I can confirm +5V vs. GND voltage when observing it.

A dmesg output when it happens: [[http://snap.reifferscheid.org/usb.txt|here]]

Latest ipq806x related devicetree changes: [[http://lists.infradead.org/pipermail/lede-commits/2016-November/001566.html|here]] and [[http://lists.infradead.org/pipermail/lede-commits/2016-November/001565.html|here]]

Initial ipq806x related changes: [[https://lists.openwrt.org/pipermail/openwrt-devel/2015-August/035335.html|here]] and [[https://lists.openwrt.org/pipermail/openwrt-devel/2015-August/035341.html|here]]

Netgear GPL source code with Linux kernel-3.4.104: [[http://www.downloads.netgear.com/files/GPL/R7500-and_qtn_gpl_src_V1.0.0.94.zip|here]]

Please let me know what to do - I have one device at hands for testing related changes.



More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=497