On Tue, 2020-05-26 at 10:59 +0200, Joakim Tjernlund wrote:
> On Tue, 2020-05-26 at 10:47 +0200, Oliver Neukum wrote:
> > Am Montag, den 25.05.2020, 16:49 +0000 schrieb Joakim Tjernlund:
> >
> > > To be clear, I can pull the cable and put it back and there are no garbage chars.
> > > There is also this error:
> > > [Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - usb_submit_urb failed: -19
> > > [Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle
> > > [Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number 86
> > > [Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts
> > >
> > > Should not this auto reenable emulate reattaching the USB cable?
> >
> > Hi,
> >
> > yes it should. You find the garage characters after the EMI event. How
> > sure are you that they arrive after the event and not during the event?
> >
>
> Don't known how to determine that?
> I can say that
> acm_ctrl_irq - usb_submit_urb failed: -19
> and
> cdc_acm 1-6.3:1.1: failed to set dtr/rts
> are unique to this EMI event though. It does not feel like this
> reenabling follow the same procedure as a cable pull?
> As I can only see the above two errors I think we should get rid of
> these first.
>
> Jocke
Been doing some more testing and found some interesting points for this
disabled by hub (EMI?), re-enabling...
error message:
1) I does not happen on Windows.
2) It only happens when rebooting the UDC device and always after the hosts has seen a:
cdc_ether 1-11.2:1.0 usb0: unregister 'cdc_ether' usb-0000:00:14.0-11.2, CDC Ethernet Device
Maybe some race in CDC tear down ?
Jocke
