linux-kernel - Re: [PATCH 1/1] ACPI: scan: Ignore Dell XPS 9320 camera graph port nodes

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Date: Wed, 12 Jun 2024 12:47:26 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Hans de Goede <hdegoede@...hat.com>, Genes Lists <lists@...ience.com>,
	linux-kernel@...r.kernel.org, mchehab@...nel.org,
	hverkuil-cisco@...all.nl, laurent.pinchart@...asonboard.com,
	wentong.wu@...el.com, linux-media@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	"regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: [PATCH 1/1] ACPI: scan: Ignore Dell XPS 9320 camera graph port
 nodes

Hi Rafael,

On Wed, Jun 12, 2024 at 02:32:26PM +0200, Rafael J. Wysocki wrote:
> > > > > I just hit the same problem on another Dell laptop. It seems that
> > > > > all Dell laptops with IPU6 camera from the Tiger Lake, Alder Lake
> > > > > and Raptor Lake generations suffer from this problem.
> > > > >
> > > > > So instead of playing whack a mole with DMI matches we should
> > > > > simply disable ACPI MIPI DISCO support on all Dell laptops
> > > > > with those CPUs. I'm preparing a fix for this to replace
> > > > > the DMI matching now.
> > > >
> > > > DisCo for Imaging support shouldn't be dropped on these systems, and this
> > > > isn't what your patch does either. Instead the ACPI graph port nodes (as
> > > > per Linux specific definitions) are simply dropped, i.e. this isn't related
> > > > to DisCo for Imaging at all.
> > >
> > > So it looks like the changelog of that patch could be improved, right?
> >
> > Well, yes. The reason the function is in the file is that nearly all camera
> > related parsing is located there, not that it would be related to DisCo for
> > Imaging as such.
> 
> So IIUC the camera graph port nodes are created by default with the
> help of the firmware-supplied information, but if that is defective a
> quirk can be added to skip the creation of those ports in which case
> they will be created elsewhere.
> 
> Is this correct?

Yes.

-- 
Sakari Ailus