Modem Manager bring up

[Senthil Kumaresan]

Hi Aleksander,

Thanks for the clarification. I will check the wwan0 interfaces and kernel
drivers.

My system is like an *ARM host -> PCIe - Qualcomm soc *( SDX modem
module).  I hope, in such a case qcom-soc plugin is applicable. Am I right?

Thanks,
SK


On Fri, Feb 4, 2022 at 4:47 PM Aleksander Morgado <aleksander at aleksander.es>
wrote:

> Hey,
>
> On Fri, Feb 4, 2022 at 10:07 PM Senthil Kumaresan
> <sekumarejobs at gmail.com> wrote:
> >
> > The ModemManager 1.18.4 is built successfully for my arm platform with
> all necessary DBUS, libqmi,
> > glib packages. I did compile ModemManager --with-udev support. I have a
> Qualcomm SDX modem module
> > connected into my host and it was detected and did see in
> /sys/bus/pci/xx.
> >
>
> You first need to make sure mhi-net and the wwan subsystem are
> correctly built in your kernel.
> Do you see a /dev/wwan0mbim0 or /dev/wwan0qmi0 port in the system?
> Do you see a wwan0 network interface?
>
> > 1) is libudev mandatory for PCIe based devices?
> >
>
> It is mandatory if you want to have automatic device detection. If
> your system supports udev, you should use udev. The non-udev builds
> are for system that rely on other ways to report device
> addition/removal events, like e.g. openwrt and its hotplug scripts.
>
> > 2) I have observed that there is no vendor id in the mm-plugin-qcom-soc.
> c file. So I have added the
> > vendor_id field as below.
> >
> > static const guint16 vendor_ids[] = {
> >         0x17cb, /* pci vid */
> >         0 };
> >
>
> That is not right I'm afraid. The qcom-soc plugin is *exclusively* for
> systems running in Qualcomm SoCs, where the "modem" is provided by the
> "host" itself.
> In your case, you have an ARM host, and an external SDX55 modem
> connected via PCIe; the qcom-soc plugin is not for that.
>
> If you're using a generic non-rebranded SDX55, you can rely on the
> "generic" plugin giving you support for the modem, forget about the
> qcom-soc plugin. And there's no need to add the vid:pid anywhere, just
> let it fallback to the generic plugin.
>
> --
> Aleksander
> https://aleksander.es
>
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