linux-kernel - Re: Fixing the devicetree of Rock 5 Model B (and possibly others)

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Date: Mon, 1 Apr 2024 16:24:51 -0700
From: Saravana Kannan <saravanak@...gle.com>
To: Dragan Simic <dsimic@...jaro.org>
Cc: Pratham Patel <prathampatel@...fossguy.com>, sebastian.reichel@...labora.com, 
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	regressions@...ts.linux.dev, stable@...r.kernel.org
Subject: Re: Fixing the devicetree of Rock 5 Model B (and possibly others)

On Sat, Mar 23, 2024 at 10:10 AM Dragan Simic <dsimic@...jaro.org> wrote:
>
> Hello Pratham,
>
> On 2024-03-23 18:02, Pratham Patel wrote:
> > Since the introduction of the `of: property: fw_devlink: Fix stupid
> > bug in remote-endpoint parsing` patch, an issue with the device-tree
> > of the Rock 5 Model B has been detected. All the stable kernels (6.7.y
> > and 6.8.y) work on the Orange Pi 5, which has the Rockchip RK3588S SoC
> > (same as the RK3588, but less I/O basically). So, being an owner of
> > only two SBCs which use the RK3588* SoC, it appears that the Rock 5
> > Model B's DT is incorrect.
> >
> > I looked at the patch and tried several things, neither resulted in
> > anything that would point me to the core issue. Then I tried this:
>
> Could you, please, clarify a bit what's the actual issue you're
> experiencing on your Rock 5B?

Pratham, can you reply to this please? I don't really understand what
your issue is for me to be able to help.

Also, can you give the output of <debugfs>/devices_deferred for the
good vs bad case?

Thanks,
Saravana

>
> > ```
> > $ grep -C 3 remote-endpoint
> > arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts
> >
> >                 port {
> >                         es8316_p0_0: endpoint {
> >                                 remote-endpoint = <&i2s0_8ch_p0_0>;
> >                         };
> >                 };
> >         };
> > --
> >                 i2s0_8ch_p0_0: endpoint {
> >                         dai-format = "i2s";
> >                         mclk-fs = <256>;
> >                         remote-endpoint = <&es8316_p0_0>;
> >                 };
> >         };
> > };
> > ```
> >
> > So, from a cursory look, the issue seems to be related to either the
> > DT node for the audio codec or related to the es8316's binding itself.
> > Though I doubt that the later is the issue because if that were the
> > issue, _someone_ with a Pine64 Pinebook Pro would've raised alarms. So
> > far, this seems to be related to the `rk3588-rock-5b.dts` and possibly
> > with the `rk3588s-rock-5a.dts` too.
> >
> > I would **love** to help but I'm afraid I device-trees are not
> > something that I am at-all familiar with. That said, I am open to
> > methods of debugging this issue to provide a fix myself.
> >
> > I would have replied to the patch's link but unfortunately, I haven't
> > yet setup neomutt and my email provider's web UI doesn't have a
> > [straightforward] way to reply using the 'In-Reply-To' header, hence a
> > new thread. Apologies for the inconvenience caused.
> >
> >   -- Pratham Patel
> > _______________________________________________
> > Linux-rockchip mailing list
> > Linux-rockchip@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip

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