Telit LE910 failing to find network

[Dan Williams]

On Tue, 2017-07-18 at 20:30 +0100, Kelvin wrote:
> Hi,
> 
> 
> > could you please attach the full debug logs, so we can have a
> > complete
> > picture of what's going on?
> > 
> 
> Thanks a lot, the full syslog is here: https://pastebin.com/6X5K0gXU

It shows the modem is using regular AT commands, when it should really
be using QMI instead.  What is "lsusb -v -d 1bc7:1201" for this device?

The problem appears to be:

Jan  1 20:48:44 linaro-gnome kernel: [   10.661323] qmi_wwan 1-2.1:1.5: 
bogus CDC Union: master=0, slave=0

Jan  1 20:48:44 linaro-gnome kernel: [   10.661409] qmi_wwan: probe of
1-2.1:1.5 failed with error -1

Bjorn/Carl/others would probably know more about why the probe fails
for this device.  But if you could grab the lsusb -v output I asked for
above, that would help figure it out.

Thanks,
Dan

> 
> > Moreover, what's the PID of your modem?
> > 
> 
> From lsusb:
> Bus 001 Device 076: ID 1bc7:1201 Telit
> Bus 001 Device 075: ID 1bc7:1201 Telit
> 
> They are both LE910s, the one I'm using (ttyUSB3 in the above syslog)
> is an
> LE910 EUG (Euro / Aus). The other which I don't have a SIM card in is
> an
> LE910 SVG (North America).
> 
> 
> > By default LE910 uses QMI protocol (cdc-wdmX device, instead of
> > ttyUSB).
> > 
> 
> Perhaps missing support from the kernel? Here are the CDC-related
> ones:
> 
> grep CDC .config
> CONFIG_USB_NET_CDCETHER=y
> # CONFIG_USB_NET_CDC_EEM is not set
> CONFIG_USB_NET_CDC_NCM=y
> # CONFIG_USB_NET_CDC_MBIM is not set
> CONFIG_USB_NET_CDC_SUBSET=y
> # CONFIG_DRM_TILCDC is not set
> # CONFIG_USB_CDC_COMPOSITE is not set

> Also QMI-related:
> grep QMI .config
> # CONFIG_MSM_TEST_QMI_CLIENT is not set
> CONFIG_USB_NET_QMI_WWAN=y
> CONFIG_MSM_QMI_INTERFACE=y
> # CONFIG_MEM_SHARE_QMI_SERVICE is not set
> CONFIG_QMI_ENCDEC=y
> # CONFIG_QMI_ENCDEC_DEBUG is not set
> 
> Many thanks for any hints,
> Kelvin.
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