Quectel em12-g minimal kernel version

[Bjørn Mork]

Alexander Dydychkin <alexander.dydychkin at vicuesoft.com> writes:

> Hi dear developers,
>
> I want to ask you about the minimal supported version of Quectel
> by qmi_wwan driver.
> I have following case:
> - Ubuntu 18.04.3 (kernel 5.0)
> - Inserted the module to the machine and have following log (1st one is
> Sierra, 2nd and 3d are Quectel modules):
> lsusb -t
> /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 10000M
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M
>     |__ Port 14: Dev 85, If 0, Class=Hub, Driver=hub/4p, 480M
>         |__ Port 1: Dev 86, If 0, Class=Human Interface Device,
> Driver=usbhid, 12M
>         |__ Port 2: Dev 89, If 0, Class=Vendor Specific Class,
> Driver=qcserial, 480M
>         |__ Port 2: Dev 89, If 2, Class=Vendor Specific Class,
> Driver=qcserial, 480M
>         |__ Port 2: Dev 89, If 3, Class=Vendor Specific Class,
> Driver=qcserial, 480M
>         |__ Port 2: Dev 89, If 8, Class=Vendor Specific Class,
> Driver=qmi_wwan, 480M
>         |__ Port 3: Dev 88, If 0, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 3: Dev 88, If 5, Class=CDC Data, Driver=cdc_mbim, 480M
>         |__ Port 3: Dev 88, If 3, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 3: Dev 88, If 1, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 3: Dev 88, If 4, Class=Communications, Driver=cdc_mbim,
> 480M
>         |__ Port 3: Dev 88, If 2, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 4: Dev 87, If 4, Class=Communications, Driver=cdc_mbim,
> 480M
>         |__ Port 4: Dev 87, If 2, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 4: Dev 87, If 0, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 4: Dev 87, If 5, Class=CDC Data, Driver=cdc_mbim, 480M
>         |__ Port 4: Dev 87, If 3, Class=Vendor Specific Class, Driver=, 480M
>         |__ Port 4: Dev 87, If 1, Class=Vendor Specific Class, Driver=, 480M


Both Quectel modems are configured for MBIM.  They work with qmi_wwan in
this mode regardless of kernel/driver version.

> mbimcli and qmicli don`t work with Quectel right now.

They should work with mbimcli.  That's all I can say based on the
provided info.

But more details are necessary to
understand the problem

> So my questions are:
> - Did I do something wrong? Or kernel 5.0 is too old for my Quectel em12-g?
> - Should Quectel em12-g work  "out-of-the-box" with kernel  5.13?
> - Any corner cases with Quectel? Any guides? :)

Can't answer specifically for the em12-g.  But in general, any USB MBIM
modem should work "out-of-the-box" with a 5.x kernel.


Bjørn