Quectel EC21, Debian Jessie, kernel 4.4 (patched)

[Brendan Simon (SEPL)]

I have a embedded linux system, which has been used with a Quectel UC20
device without any issues, but moving to the Quectel EC21 is proving
problematic.

Setup is:

    Zynq 7000 ARM SOC
    EC21 dev-kit (connected via USB)
    Analog Devices linux kernel 4.4 -- monkey patched for EC21 using:

        https://www.quectel.com/UploadImage/Downlad/Quectel_WCDMA&LTE_Linux_USB_Driver_User_Guide_V1.8.pdf

    Debian Jessie (8.10)
    ii  modemmanager     1.4.0-1     armhf
    ii  network-manager  0.9.10.0-7  armhf


After the patches were applied, the device is recognise on the USB bus
and MM also recongises the modem.  However I'm getting a failed status
of SIM not found ("sim-missing"), but the SIM is present the dev-kit is
known to work using a Windows box (i.e. gets an IP address from the 4G
service).

In linux, after power up, MM shows the "sim-missing" failure reason.

Interestingly, after I press the reset button on the dev-kit, MM
recognises a new modem and shows a "registered" status.

I system now recognises the modem (/dev/cdc-wdm0 is registered as well
as some /dev/ttyUSB* devices).

However, nmcli shows the device as a ttyUSB instead of cdc-wdm0 !! 
Looking at mmcli outupt, it seems the "primary port" changes from
"cdc-wdm0" to "ttyUSB8".

Is this normal?  Can I force it to only use cdc-wdm?

Why does the SIM get recognised after pressing the reset button and
using the ttyUSB interface, and not recongised after powerup and using
the cdc-wdm0 interface?

I also tried connecting the dev-kit to a Debian 9 VM, but I couldn't get
MM to recognise it at all.  The ttyUSB and cdc-wdm0 interfaces were
present, but "mmcli -L" shows nothing ("No modems found")

Could this be related or is it a different problem altogether?

How can I get MM to recognise the modem in the Debian 9 setup?

    linux kernel     4.9.65-3
    modemmanager     1.6.4-1
    network-manager  1.6.2-3

Any help greatly appreciated :)

Brendan.

------------------------------------------------------------------------

_*Output of ModemManager CLI (mmcli) after power up (show*__*s
"sim-missing")*_

    # mmcli -m 6

    /org/freedesktop/ModemManager1/Modem/6 (device id
    'cf405e3ef544de99803c75ef99bcee51b6560e65')
      -------------------------
      Hardware |   manufacturer: 'QUALCOMM INCORPORATED'
               |          model: '0'
               |       revision: 'EC21AUTFAR02A03M4G  1  [Mar 21 2016
    11:00:00]'
               |      supported: 'gsm-umts
               |                  lte
               |                  gsm-umts, lte'
               |        current: 'lte'
               |   equipment id: '864430010001091'
      -------------------------
      System   |         device:
    '/sys/devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1'
               |        drivers: 'option1, qmi_wwan'
               |         plugin: 'Generic'
               |   primary port: 'cdc-wdm0'
               |          ports: 'ttyUSB8 (at), ttyUSB9 (at), cdc-wdm0
    (qmi), ttyUSB4 (qcdm), wwan0 (net)'
      -------------------------
      Numbers  |           own : 'unknown'
      -------------------------
      Status   |           lock: 'unknown'
               | unlock retries: 'unknown'
    *           |          state: 'failed'*
    *           |  failed reason: 'sim-missing'*
               |    power state: 'unknown'
               |    access tech: 'unknown'
               | signal quality: '0' (cached)
      -------------------------
      Modes    |      supported: 'allowed: 4g; preferred: none'
               |        current: 'allowed: any; preferred: none'
      -------------------------
      Bands    |      supported: 'unknown'
               |        current: 'unknown'
      -------------------------
      IP       |      supported: 'ipv4, ipv6, ipv4v6'
      -------------------------
      SIM      |           path: 'none'

      -------------------------
      Bearers  |          paths: 'none'

_*
Output of ModemManager CLI (mmcli) after pressing reset button
(show*__*s "sim-missing")*_

    # mmcli -m 7

    /org/freedesktop/ModemManager1/Modem/7 (device id
    '6b3daac3d42eca119fcfa4462b377af7398551d4')
      -------------------------
      Hardware |   manufacturer: 'Quectel'
               |          model: 'EC21'
               |       revision: 'EC21AUTFAR02A03M4G'
               |      supported: 'lte'
               |        current: 'lte'
               |   equipment id: '864430010001091'
      -------------------------
      System   |         device:
    '/sys/devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1'
               |        drivers: 'qmi_wwan, option1'
               |         plugin: 'Generic'
               |   primary port: 'ttyUSB8'
               |          ports: 'ttyUSB8 (at), ttyUSB9 (at), ttyUSB4
    (qcdm), wwan0 (net)'
      -------------------------
      Numbers  |           own : 'unknown'
      -------------------------
      Status   |           lock: 'none'
               | unlock retries: 'unknown'
    ***           |          state: 'registered'*
               |    power state: 'on'
               |    access tech: 'lte'
               | signal quality: '100' (recent)
      -------------------------
      Modes    |      supported: 'allowed: 2g, 3g, 4g; preferred: none'
               |        current: 'allowed: 2g, 3g, 4g; preferred: none'
      -------------------------
      Bands    |      supported: 'unknown'
               |        current: 'unknown'
      -------------------------
      IP       |      supported: 'none'
      -------------------------
      3GPP     |           imei: '864430010001091'
               |  enabled locks: 'none'
               |    operator id: '50501'
               |  operator name: 'Telstra Mobile Telstra'
               |   subscription: 'unknown'
               |   registration: 'home'
      -------------------------
      SIM      |           path: '/org/freedesktop/ModemManager1/SIM/2'

      -------------------------
      Bearers  |          paths: 'none'


Regards,
Brendan
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