Re: dwc3 gadget and USB3

[Joakim Tjernlund <Joakim.Tjernlund@infinera.com>]

On Wed, 2023-03-08 at 19:58 +0100, gregkh@linuxfoundation.org wrote:
> On Wed, Mar 08, 2023 at 06:12:51PM +0000, Joakim Tjernlund wrote:
> > On Wed, 2023-03-08 at 18:25 +0100, Greg KH wrote:
> > > On Wed, Mar 08, 2023 at 05:10:17PM +0000, Joakim Tjernlund wrote:
> > > > we are using fsl-ls1043a-rdb based design but with a ls1023a SOC and
> > > > use USB0 in gadget mode running either NCM or RNDIS ethernet on top.
> > > > 
> > > > When we connect the gadget to a PC(Linux of Windows) over an USB2 hub,
> > > > networking(NCM or RNDIS) works well.
> > > > 
> > > > However, when we connect the gadget directly to the PC/laptop which uses USB3
> > > > we see something odd:
> > > >   Ping from PC to gadget works.
> > > >   Ping from gadget to laptop does not. However if we also ping from PC at the same time we
> > > >   see gadget to PC start working.
> > > > Seems like ping from the PC tiggers the gadget to see incoming pkgs somehow.
> > > > 
> > > > Any idea what might be wrong or how to debug this?
> > > > Kernel 5.15.87
> > > 
> > > 5.15.y is very old, does this also happen on 6.2?
> > > 
> > 
> > I just tried 6.1.15 and the problem remains, I hope that is close enough ?
> 
> It's good enough :)
> 
> Have any logs at all that show any problems?
> 
No, don't know where to start. There are no errors logged.

>   Also, you might want to
>  cc:  the dwc3 maintainer...

I thought I did but that look like old info, added Thinh Nguyen now, thanks

 Jocke

> 
>  thanks,
> 
>  greg k-hj