How to reset selected port in usb driver

Technical Support
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1

Hi,
I am using Colibri iMX7d, refer below:

root@colibri-imx7-emmc:~# uname -a
Linux colibri-imx7-emmc 4.9.166-2.8.6+gd899927728be #1 SMP Fri Aug 30 17:28:06 UTC 2019 armv7l GNU/Linux
root@colibri-imx7-emmc:~# lsb_release -a
Distributor ID: Angstrom
Description:    Angstrom GNU/Linux v2017.12 (Core edition)
Release:        v2017.12
Codename:       Core edition
root@colibri-imx7-emmc:~#

I have connected USB hub and 3 USB devices to it. I want to reset selected USB device as it’s device requirement for specific function.

root@colibri-imx7-emmc:~# lsusb 
Bus 001 Device 004: ID 8086:0ad3 
Bus 002 Device 001: ID 1d6b:0002 
Bus 001 Device 003: ID 0bda:8179 
Bus 001 Device 002: ID 0bda:5411 
Bus 001 Device 001: ID 1d6b:0002

I don’t want to reset all the devices on USB. I want to know:

  1. How can I reset selected USB device
  2. Suppose I have two instances same devices in port 0 and 1, how can I differentiate which device is in USB Hub port 0, 1.

Thank you
Neeraj

2

Hi @neeraj.verma

For resetting a specific USB Port uhubctl can be used. We plan to integrate this feature in Bsp 4.0.

Best regards,
Jaski