libqmi / Quectel EC21/EC25

[Sebastian Sjoholm]

Hi,

What would be best way for me to debug qmi_wwan.c to see what I am missing
regarding the QMI communication with EC25. The EC25 (as the EC21) support
does not exists in the 4.7.4 kernel, but I have added it to option.c as
well as in the qmi_wwan.c.

I have also tried to include the quirk added (in qmi_wwan.c) for EC20, but
can't really see any difference with or without it.

root at EC25:~# qmicli -d /dev/cdc-wdm0 --nas-get-system-info -v
[20 Sep 2016, 08:24:30] [Debug] [/dev/cdc-wdm0] Opening device with flags
'none'...
[20 Sep 2016, 08:24:30] [Debug] QMI Device at '/dev/cdc-wdm0' ready
[20 Sep 2016, 08:24:30] [Debug] [/dev/cdc-wdm0] Assuming service 'nas' is
supported...
[20 Sep 2016, 08:24:30] [Debug] [/dev/cdc-wdm0] Allocating new client ID...
[20 Sep 2016, 08:24:30] [Debug] [/dev/cdc-wdm0] Sent message...
<<<<<< RAW:
<<<<<<   length = 16
<<<<<<   data   = 01:0F:00:00:00:00:00:01:22:00:04:00:01:01:00:03

[20 Sep 2016, 08:24:30] [Debug] [/dev/cdc-wdm0] Sent message (translated)...
<<<<<< QMUX:
<<<<<<   length  = 15
<<<<<<   flags   = 0x00
<<<<<<   service = "ctl"
<<<<<<   client  = 0
<<<<<< QMI:
<<<<<<   flags       = "none"
<<<<<<   transaction = 1
<<<<<<   tlv_length  = 4
<<<<<<   message     = "Allocate CID" (0x0022)
<<<<<< TLV:
<<<<<<   type       = "Service" (0x01)
<<<<<<   length     = 1
<<<<<<   value      = 03
<<<<<<   translated = nas

error: couldn't create client for the 'nas' service: CID allocation failed
in the CTL client: Transaction timed out
root at EC25:~#

I have added debug in the kernel, but I don't get much data;

[ 2045.748535] qmi_wwan_manage_power: qmi_wwan 2-1.2:1.4:
qmi_wwan_manage_power() pmcount=0, on=1
[ 2045.770015] wdm_write: qmi_wwan 2-1.2:1.4: Tx URB has been submitted
index=4
[ 2055.862822] wdm_release: qmi_wwan 2-1.2:1.4: wdm_release: cleanup
[ 2055.871927] qmi_wwan_manage_power: qmi_wwan 2-1.2:1.4:
qmi_wwan_manage_power() pmcount=1, on=0

The QMI device is found at boot;

[   14.259944] qmi_wwan 2-1.2:1.4: cdc-wdm0: USB WDM device
[   14.264015] qmi_wwan 2-1.2:1.4 wwan0: register 'qmi_wwan' at
usb-ci_hdrc.1-1.2, WWAN/QMI device, aa:2c:3e:0c:b4:81

root at EC25:~# lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ci_hdrc/1p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 2: Dev 3, If 0, Class=Vendor Specific Class,
Driver=option, 480M
        |__ Port 2: Dev 3, If 1, Class=Vendor Specific Class,
Driver=option, 480M
        |__ Port 2: Dev 3, If 2, Class=Vendor Specific Class,
Driver=option, 480M
        |__ Port 2: Dev 3, If 3, Class=Vendor Specific Class,
Driver=option, 480M
        |__ Port 2: Dev 3, If 4, Class=Vendor Specific Class,
Driver=qmi_wwan, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ci_hdrc/1p, 480M
root at EC25:~#

root at EC25:~# uname -a
Linux EC25 4.7.4-quectelv7-debug-dirty #1 SMP Tue Sep 20 07:42:57 CEST 2016
armv7l GNU/Linux
root at EC25:~#

There is a thread regarding the EC21 on
https://lists.freedesktop.org/archives/modemmanager-devel/2016-September/003402.html

But I am also interested for future reference and modems what would be the
best way to provide as much info as possible when having issues with the
QMI communication.

-Sebastian
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