[PATCH 1/1] usb: request only 8 bytes for USB_SPEED_FULL bMaxPacketSize0 discovery

Thomas Glanzmann thomas at glanzmann.de
Mon Sep 26 09:34:05 CEST 2022


Hallo Marek,

> Can you be more specific about those logitech receivers ? I might have one
> of those devices, and I have DWC3 in i.MX8MP and i.MX8MQ, as well as ZynqMP,
> so I should be able to try and trigger the problem. Can you share the
> reproducer test case for this problem ?

I can reproduce the issue with Keychron K1 and Realforce keyboards on the
usb-c port of my mac mini 2020 model running u-boot. The two keyboards
don't work without Jannes patch. With Jannes patch, they work. Other
keyboards like my Thinkpad compact keyboard work with and without the
patch.

https://www.keychron.com/products/keychron-k1-wireless-mechanical-keyboard
https://www.realforcekeyboards.com
https://www.lenovo.com/de/de/accessories-and-monitors/keyboards-and-mice/keyboards/KEYBOARD-German/p/0B47202

Cheers,
        Thomas


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