Will modem inhibition truly release MBIM port ?

Edward Chang edward.chang.foxconn at gmail.com
Wed Sep 16 09:53:38 UTC 2020

  > Are you using the "Modem Reboot" command only? Or something else?
No, we added a new command.

The image file was sent to the module fragment by fragment.
Without the mbim-proxy, the transmission process is fluent.
But when using the mbim-proxy, it will return "MBIM protocol error:
FragmentOutOfSequence" after sending the first request(fragment).
It is weird because we get the out-of-sequence error when we just try to
send the first fragment.
Is it possible that the mbim-proxy is not correctly configured for such
transmission ?

Edward Chang.

On Fri, Sep 11, 2020 at 3:47 PM Aleksander Morgado <aleksander at aleksander.es>

> Hey Edward,
> >                        We are now implementing qualcomm device update
> (qdu) MBIM device service on the libmbim currently used by the MM and fwupd.
> >                        It uses the MBIM_SERVICE_INTEL_FIRMWARE_UPDATE
> service.
> Are you using the "Modem Reboot" command only? Or something else?
> >                        We found the update process will succeed only if
> the modemmanager is stopped and the mbim port is opened without the proxy.
> >                        Probably the mbim interface could not be
> interfered during the update process.
> You need to investigate why that happens, because it doesn't make much
> sense. It is true that the MBIM session is kept open by the proxy, but
> other than that, there is no other interaction triggered by the proxy
> itself, the only interactions done by the proxy are triggered by
> connected clients.
> If your client connects to the proxy, you should be able to send
> messages without any problem.
> >                        Could we stop the mbim-proxy during update and
> restart it after update ?
> >
> That is currently not possible, stopping the mbim-proxy will break
> other firmware upgrade processes, like the one for the DW5821e. If
> there is any issue triggered by the proxy itself, we should fix the
> proxy, not stop it
> --
> Aleksander
> https://aleksander.es
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