linux-kernel - v5.15-rcX regression: video devices on i.MX6 are not created

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <m3lf39nfsq.fsf@t19.piap.pl>
Date:   Mon, 04 Oct 2021 14:19:17 +0200
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: v5.15-rcX regression: video devices on i.MX6 are not created

Hi Saravana et al.,

FYI the patch: 6b2117ad65f1bca9ece6d4b1ee784b42701a2d86

of: property: fw_devlink: Add support for "resets" and "pwms"

Allows better tracking of dependencies between devices.

 drivers/of/property.c | 4 ++++

breaks v4l2 video devices on an i.MX6 CPU. The /dev/video* nodes are not
created, and the drivers (async subdevicess) are "waiting":

# cat /sys/kernel/debug/v4l2-async/pending_async_subdevices

imx-media:
 [fwnode] dev=nil, node=/soc/ipu@...0000/port@0
 [fwnode] dev=nil, node=/soc/ipu@...0000/port@1
 [fwnode] dev=nil, node=/soc/ipu@...0000/port@0
 [fwnode] dev=nil, node=/soc/ipu@...0000/port@1
imx6-mipi-csi2:
 [fwnode] dev=0-0036, node=/soc/bus@...0000/i2c@...0000/camera@36
ipu2_csi1_mux:
ipu1_csi0_mux:
 [fwnode] dev=21dc000.mipi, node=/soc/bus@...0000/mipi@...c000

Reverting the patch (or commenting the "resets" out) fixes the problem:

# cat /sys/kernel/debug/v4l2-async/pending_async_subdevices
ipu2_csi1:
ipu2_csi0:
ipu1_csi1:
ipu1_csi0:
imx-media:
imx6-mipi-csi2:
ipu2_csi1_mux:
ipu1_csi0_mux:


What now?
--
Krzysztof "Chris" Hałasa

Sieć Badawcza Łukasiewicz
Przemysłowy Instytut Automatyki i Pomiarów PIAP
Al. Jerozolimskie 202, 02-486 Warszawa