Mity CPU Platforms » MitySOM-AM62, MitySOM-AM62A, & MitySOM-AM62P

12/10/2024

JC 03:03 PM Software Development: RE: USB Device mode communication problems

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1449610/am625-backport-disable-usb-lpm-to-6-6-kernel-- Jonathan Cormier

JC 02:44 PM Software Development: RE: USB Device mode communication problems

iseori kang wrote in message#6830:
> Hello,
> ...
Good find. Interestingly in the 6.6 kernel both the AM62A and AM62P have those lpm-disable options for both USB0 and USB1.
https://lore.kernel.org/all/20240412-for-v6-10-am62-usb-t... Jonathan Cormier

IK 09:46 AM Software Development: RE: USB Device mode communication problems

Hello,
The team seems to have solved it with the following settings.
Fixed Dts file
snps,usb2-lpm-disable;
snps,usb2-gadget-lpm-disable;
best regards, iseori kang

IK 03:06 AM Software Development: RE: USB Device mode communication problems

Forwarding additional content
Messages when USB is working
[ 259.298196] drivers/usb/dwc3/gadget.c:3693 dwc3_gadget_interrupt() event->type = 0/Disconnect
[ 267.416974] drivers/usb/dwc3/gadget.c:3693 dwc3_gadget_interrupt() even... iseori kang

IK 12:21 AM Software Development: RE: USB Device mode communication problems

Hello,
We noticed that the message is different for success and failure.
It is only coming from a few laptops.
(Lenovo family more often)
I've attached a schematic, nothing special.
USB1 is being used for internal communicatio... iseori kang

12/09/2024

JC 03:27 PM Software Development: RE: USB Device mode communication problems

> Have you sent Jonathan a copy of your schematic, I can review that as well.
The schematic I received was only the ethernet section so its missing the USB. Jonathan Cormier

MW 02:15 PM Software Development: RE: USB Device mode communication problems

I have not been able to reproduce it here, yet.
Do you get any messages from "dmesg" when the communication is dropped?
If you unplug and replug the cable, does the connection re-establish?
Have you sent Jonathan a copy of your ... Michael Williamson

IK 07:10 AM Software Development: RE: USB Device mode communication problems

Hello, Mike.
Do you have any updates on this?
Thank you and best regards, iseori kang