Neoway n720 (mPCIe version) - uqmi hangs

[Saurabh Chakrabarti]

Hi

I'm trying to get the following modules to work:

Quectel EC25-E (mPCIe version) - works without any problem
Neoway n720 (mPCIe version) - no response from uqmi frequently


These modules are connected to a raspberry pi based device. This device
works on openWRT chaos calmer 15.05(kernel 4.4.7)

I have added the following series of Bjørn Mork's patches for this to work
for quectel EC25

https://www.mail-archive.com/netdev@vger.kernel.org/msg89815.html - [PATCH
0/6] net: qmi_wwan: MDM9x30 support
https://www.mail-archive.com/netdev@vger.kernel.org/msg89811.html - [PATCH
1/6] net: qmi_wwan: MDM9x30 specific power management
https://www.mail-archive.com/netdev@vger.kernel.org/msg89813.html - [PATCH
2/6] net: qmi_wwan: remove 1199:9070 device id
https://www.mail-archive.com/netdev@vger.kernel.org/msg89814.html - [PATCH
3/6] usbnet: allow mini-drivers to consume L2 headers
https://www.mail-archive.com/netdev@vger.kernel.org/msg89810.html - [PATCH
4/6] net: qmi_wwan: support "raw IP" mode
https://www.mail-archive.com/netdev@vger.kernel.org/msg89812.html - [PATCH
5/6] net: qmi_wwan: document the qmi/raw_ip sysfs file
https://www.mail-archive.com/netdev@vger.kernel.org/msg89816.html - [PATCH
6/6] MAINTAINERS: add qmi_wwan driver entry
https://www.mail-archive.com/netdev@vger.kernel.org/msg90225.html - [PATCH
net-next] net: qmi_wwan: should hold RTNL while changing netdev type

I have also added the relevant vendorid and productid changes for neoway
n720.

Quectel EC25-E works perfectly. For neoway n720, the device well works
sometimes, and i'm able to connect to internet. But sometimes uqmi commands
just hang(no output and the terminal gets stuck on the command). I don't
see any kernel error logs too.

Is there something that I can do to fix this issue. Did anyone face the
uqmi hanging issue in other similar modules? Is there any way to debug this?

Regards,
Saurabh
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