netdev - Re: [PATCH] Add NMEA GPS character device for PCIe MHI Quectel Module to read NMEA statements.

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Message-Id: <ZXTIPS.5HTA0G5SXE7D3@unrealasia.net>
Date: Sat, 04 Jan 2025 00:32:23 +0800
From: Muhammad Nuzaihan <zaihan@...ealasia.net>
To: Sergey Ryazanov <ryazanov.s.a@...il.com>
Cc: netdev@...r.kernel.org, Loic Poulain <loic.poulain@...aro.org>,
	Johannes Berg <johannes@...solutions.net>, Andrew Lunn <andrew@...n.ch>,
	Slark Xiao <slark_xiao@....com>
Subject: Re: [PATCH] Add NMEA GPS character device for PCIe MHI Quectel Module
 to read NMEA statements.

Hi Sergey,

Apparently after a new recompilation the entire kernel and modules 
fixes the problem with wwan0nmea0 port get attached at bootup. I had 
previously only compiled modules without the kernel during development.

Before that i went to debug several wwan_core.c device wwan_create_port 
and wwan_create_dev functions to see what's going on not being loaded 
at bootup and seemed that a recompile the entire kernel and module 
fixes that. Checked my diffs and saw no changes.

So now, everything works perfectly at bootup and I have to tell 
ModemManager to ignore NMEA port type. So booting up with a fresh new 
kernel and module gets my 5G working automatically at boot.

No need to unload and reload of the kernel modules and configuring with 
AT commands to wwan0at0 with scripts, now everything works seamlessly.

So to ensure ModemManager can work with this setup, i would add a new 
udev rule for ModemManager to not probe wwan0nmea0 port (which i think 
i will submit this to ModemManger project):

# ModemManager ignore NMEA
ATTRS{vendor}=="0x1eac", ATTRS{device}=="0x1007", ATTR{type}=="NMEA", 
ENV{ID_MM_PORT_IGNORE}="1"

I'll submit the "cleaned up" v3 nmea patch later tomorrow, it's a 
pretty small patch. (It's 12AM now here in Malaysia)

- Zaihan

On Fri, Jan 3 2025 at 03:15:34 AM +0800, Muhammad Nuzaihan 
<zaihan@...ealasia.net> wrote:
> Hi Sergey,
> 
> 
> On Fri, Jan 3 2025 at 02:05:19 AM +0800, Muhammad Nuzaihan 
> <zaihan@...ealasia.net> wrote:
>> Hi Sergey,
>>