Hi Minas, first of all, I want to apologize for the big delay in this discussion. On Tue, Aug 3, 2021 at 11:32 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > Minas, you should look at analysis of the usbmon information below. Minas, it would be great if you could take the time to go through Alan's findings. Since it's been a while I am trying to summarize the current state of the findings here. In [0] Alan mentioned: > Minas, some of the things noted below may require your attention. In > particular, the usbmon traces don't show the root hub doing what it should, > which leads me to wonder whether the Genesys Logic hub attached to port 1 > really is getting suspended and resumed properly. Then in [1] Alan goes through the usbmon traces from my Meson8b Odroid-C1+ and comes to the following conclusion: > [...] the trace shows that the GL hub was never fully suspended! > > So the question is: Why doesn't the port status on the DWC2 root hub > show the suspend feature set, and why doesn't the root hub port get > suspended? This looks like a bug in the dwc2 driver. [...] Linux 5.16-rc4 is still affected by this issue, meaning that it hasn't been fixed in the meantime. I am happy about any feedback which can help resolve this issue. That means: even if you have an idea (like: flipping bit X in register Y could help) which you are unable to test yourself then please let me know - I can take care of the testing part (and share debug logs/usbmon traces if needed). Thank you and best regards, Martin [0] https://lore.kernel.org/linux-usb/20210721155817.GC633399@xxxxxxxxxxxxxxxxxxx/ [1] https://lore.kernel.org/linux-usb/20210803213216.GA376608@xxxxxxxxxxxxxxxxxxx/
