From: John Watts <contact@jookia.org>
To: Saravana Kannan <saravanak@google.com>
Cc: "Rob Herring" <robh+dt@kernel.org>,
"Frank Rowand" <frowand.list@gmail.com>,
"Hervé Codina" <herve.codina@bootlin.com>,
"Luca Ceresoli" <luca.ceresoli@bootlin.com>,
kernel-team@android.com, "Rob Herring" <robh@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] of: property: fw_devlink: Fix stupid bug in remote-endpoint parsing
Date: Sat, 23 Mar 2024 23:19:55 +1100 [thread overview]
Message-ID: <Zf7I65PiOR2wX1Uo@titan> (raw)
In-Reply-To: <CAGETcx8+vw0Vr0NWzjOAvxAZ07M4U7BWPAgO9avCngW0-9e_kA@mail.gmail.com>
Hello again,
On Fri, Mar 22, 2024 at 06:53:57PM -0700, Saravana Kannan wrote:
> Hmmm.... cycle detection should work here and not enforce probe
> ordering. I'd appreciate help with debugging that. Let me look at it
> on Monday. Can you enabled all the debug logs in drivers/base/core.c
> and tell me what cycle detection is telling about these nodes?
Hmm. It's not saying anything more than what I've already sent.
I think this is because /sound/multi isn't a device, it's just a
subnode used in audio-graph-card2.
Removing the multi { } section and using direct graph connections
'fixes' this.
I think this might be because usually in a graph each node containing
ports is a device, such as a display panel, a bridge, an LCD
controller. These kind of form a dependency chain.
In this case all the ports in multi act as a way to glue multiple
ports together for the audio-graph-card2.
Does that help?
> But the better fix would be to use the new "post-init-providers"
> property. See below.
>
> >
> > / {
> > ...
> >
> >
> > test_codec {
> > compatible = "test-codec";
> > prefix = "Test codec";
> > #sound-dai-cells = <0>;
>
> post-init-provider = <&multi>;
>
> Right now there's a cyclic dependency between test_codec and multi and
> this tells the kernel that test codec needs to probe first.
>
> Similar additions to the other nodes blocked on multi.
>
> Thanks,
> Saravana
John.
next prev parent reply other threads:[~2024-03-23 12:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-24 5:24 [PATCH] of: property: fw_devlink: Fix stupid bug in remote-endpoint parsing Saravana Kannan
2024-02-24 5:28 ` Saravana Kannan
2024-02-26 12:04 ` Luca Ceresoli
2024-02-29 0:20 ` Rob Herring
2024-02-26 8:19 ` Luca Ceresoli
2024-02-26 8:56 ` Herve Codina
2024-02-29 10:11 ` Geert Uytterhoeven
2024-02-29 22:45 ` Saravana Kannan
2024-02-29 22:47 ` Saravana Kannan
2024-03-14 1:48 ` Saravana Kannan
2024-03-14 8:46 ` Geert Uytterhoeven
2024-03-15 5:50 ` Saravana Kannan
2024-03-01 21:28 ` Rob Herring
2024-03-21 6:04 ` John Watts
2024-03-23 1:53 ` Saravana Kannan
2024-03-23 12:19 ` John Watts [this message]
2024-03-25 22:49 ` Saravana Kannan
2024-03-26 0:42 ` John Watts
2024-03-26 1:35 ` Saravana Kannan
2024-03-26 1:42 ` John Watts
2024-03-26 2:31 ` John Watts
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