Date:   Thu, 11 Aug 2022 10:23:26 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Wang Yating <yating.wang@...el.com>,
        Christoph Jechlitschek <christoph.jechlitschek@...el.com>,
        Hao Yao <hao.yao@...el.com>, Andy Yeh <andy.yeh@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        linux-media@...r.kernel.org, Mark Pearson <markpearson@...ovo.com>,
        Dell.Client.Kernel@...l.com, linux-kernel@...r.kernel.org,
        Guenter Roeck <groeck@...gle.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Whitcroft <apw@...onical.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Christian Schaller <cschalle@...hat.com>,
        Wouter Bolsterlee <wouter@...sterl.ee>,
        Miguel Palhas <mpalhas@...il.com>, it+linux-media@...gen.mpg.de
Subject: Missing MIPI IPU6 camera driver for Intel Alder Lake laptops

[Cc: folks from IPU6 external driver, IPU3 maintainers, Dell, Lenovo, 
Chromium, Canonical/Ubuntu, Red Hat]

Dear Greg,


I am writing you, because I remember you – at least – were active 
several years ago in getting good upstream driver support into the Linux 
kernel.

It looks like the driver for the MIPI IPU6 camera of Intel Alder Lake 
based laptops, for example, Lenovo ThinkPad X1 Carbon and Dell XPS 13 
9315/9320, is not in the upstream Linux kernel.

With Ubuntu’s OEM image pre-installed by Dell, and on Google Chromebooks 
the camera is supposedly working [1]. There is a GitHub project with a 
repository for the Linux kernel patches [2], but the patches – as 
expected, and known from other external drivers, and Android drivers – 
do not build against all Linux kernel versions [3]. A request to 
upstream the drivers was opened at the end of March [4], and got the 
reply below in July:

> Intel is not ready yet to provide technical support to various Linux
> distro and all OEM devices at this moment with Intel IPU6 github.
> 
> Intel is supporting Dell laptop and their MIPI camera functionality
> on Ubuntu with release/integration support from Canonical. If you are
> using Dell devices, please refer to the devices listed in this link.
> (https://wiki.ubuntu.com/Dell) You can learn the latest updates from
> the installation guide.
The patches were integrated into ChromiumOS’ Linux kernel tree – for 
specific version, like 5.15 [5], and the same for Ubuntu 22.04 with 
Linux 5.15 – only in June [6]. A lot of that (redundant) work seems to 
be done by the Intel developers involved also in the GitHub project.

In the last seven or so years Linux upstream driver support worked well 
for me – especially with Intel hardware –, so I wanted to make you (and 
others) aware of the situation, and hope, that you could do something 
about the situation. With the current situation I can only recommend to 
FLOSS users to *not* buy these devices.


Kind regards,

Paul


PS: The proprietary firmware is also not in the linux-firmware 
repository [7], and the user space packages [8] are also not packaged 
yet for some distributions like Debian.

PPS: VA-API support also does not work [9].

[1]: https://ubuntu.com/certified/202203-30070
[2]: https://github.com/intel/ipu6-drivers
[3]: https://github.com/intel/ipu6-drivers/issues/13
[4]: https://github.com/intel/ipu6-drivers/issues/22
[5]: 
https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/3034663
[6]: 
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/log/drivers/media/pci/intel
[7]: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1955383
[8]: 
https://launchpad.net/~oem-solutions-group/+archive/ubuntu/intel-ipu6/+packages
[9]: https://github.com/intel/media-driver/issues/1371
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