linux-kernel - Re: [PATCH v1 1/1] usb: csc-acm: add Infineon/Comneon modem support (1519:0020)

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Message-ID: <8a7ed9d1-c667-418a-a72a-d8d24ed0f9f8@gmail.com>
Date: Mon, 26 Jan 2026 20:51:25 +0700
From: Lars Melin <larsm17@...il.com>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: Oliver Neukum <oneukum@...e.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] usb: csc-acm: add Infineon/Comneon modem support
 (1519:0020)

On 2026-01-22 23:17, Svyatoslav Ryhel wrote:
> чт, 22 січ. 2026 р. о 17:58 Lars Melin <larsm17@...il.com> пише:
>>
>> On 2026-01-22 22:17, Svyatoslav Ryhel wrote:
>>> Add support for Infineon/Comneon XMM626X modem that used in many Tegra30
>>> devices with GSM capablities like LG Optimus 4X (P880) and Vu (P895).
>>>
>>> The Vendor Id is 0x1519
>>> The Product ID is 0x0020
>>>
>>> Output of lsusb:
>>> Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
>>>
>>> Signed-off-by: Svyatoslav Ryhel <clamor95@...il.com>
>>
>> Hi,
>> please include a full lsusb output, ie lsusb -vd 1519:0020 so we can
>> verify that union descriptors are missing.
>> (I have seen a full lsusb output where they are included.)
>>
> Hello there! Sure, here is what I get if I use lsusb -vd 1519:0020
> 
> lg-p895:~$ lsusb
> Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> lg-p895:~$ lsusb -vd 1519:0020
> Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> lg-p895:~$ lsusb -vd 1519:0020
> Bus 001 Device 001: ID 1d6b:0002 Linux 6.16.0+ ehci_hcd EHCI Host Controller
> Bus 001 Device 002: ID 1519:0020 Comneon HSIC Device
> 
> regular lsusb is added for reference.


You are using a stripped down version of lsusb which doesn't give a 
verbose output, please install the full version and try again.
If you don't have the full lsusb, how do you then know that your
device has a faulty union descriptor?
The full lsusb listing that I have for 1519:0020 has a correct
union descriptor so doesn't need a quirk.

thanks
Lars