linux-kernel - Re: [PATCH v2 05/12] media: ipu-bridge: Use v4l2

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

Message-ID: <aGzjTRSco39mKJcf@kekkonen.localdomain>
Date: Tue, 8 Jul 2025 09:22:21 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 05/12] media: ipu-bridge: Use v4l2_fwnode for unknown
 rotations

Hi Ricardo,

On Tue, Jul 08, 2025 at 11:16:25AM +0200, Ricardo Ribalda wrote:
> Hi Sakari
> 
> Thanks for your review
> 
> On Mon, 7 Jul 2025 at 23:45, Sakari Ailus <sakari.ailus@...ux.intel.com> wrote:
> >
> > Hi Ricardo,
> >
> > On Thu, Jun 05, 2025 at 05:52:58PM +0000, Ricardo Ribalda wrote:
> > > The v4l2_fwnode_device_properties contains information about the
> > > rotation. Use it if the ssdb data is inconclusive.
> >
> > As SSDB and _PLD provide the same information, are they always aligned? Do
> > you have any experience on how is this actually in firmware?
> 
> Not really, in ChromeOS we are pretty lucky to control the firmware.
> 
> @HdG Do you have some experience/opinion here?
> 
> >
> > _PLD is standardised so it would seem reasonable to stick to that -- if it
> > exists. Another approach could be to pick the one that doesn't translate to
> > a sane default (0°).
> 
> I'd rather stick to the current prioritization unless there is a
> strong argument against it. Otherwise there is a chance that we will
> have regressions (outside CrOS)

My point was rather there are no such rules currently for rotation: only
SSDB was being used by the IPU bridge to obtain the rotation value,
similarly only _PLD is consulted when it comes to orientation.

-- 
Regards,

Sakari Ailus