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

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Message-ID: <CAGETcx_ToHsp_c+Yt0qqST4Zd-GC7dPn_j=PpB1n1xpZtOnMfg@mail.gmail.com>
Date: Tue, 2 Apr 2024 17:46:04 -0700
From: Saravana Kannan <saravanak@...gle.com>
To: Pratham Patel <prathampatel@...fossguy.com>
Cc: Dragan Simic <dsimic@...jaro.org>, 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 Tue, Apr 2, 2024 at 4:32 PM Pratham Patel
<prathampatel@...fossguy.com> wrote:
>
> On Tue Apr 2, 2024 at 4:54 AM IST, Saravana Kannan wrote:
> > 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:
> > > > 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.
>
> Hi,
>
> I apologize for not replying. Somehow, I did not notice the reply from
> Dragan. :(
>
> Since this patch was applied, an issue in the Rock 5B's DT has been
> unearthed which now results in the kernel being unable to boot properly.
>
> Following is the relevant call trace from the UART capture:
>
> [   21.595068] Call trace:
> [   21.595288]  smp_call_function_many_cond+0x174/0x5f8
> [   21.595728]  on_each_cpu_cond_mask+0x2c/0x40
> [   21.596109]  cpuidle_register_driver+0x294/0x318
> [   21.596524]  cpuidle_register+0x24/0x100
> [   21.596875]  psci_cpuidle_probe+0x2e4/0x490
> [   21.597247]  platform_probe+0x70/0xd0
> [   21.597575]  really_probe+0x18c/0x3d8
> [   21.597905]  __driver_probe_device+0x84/0x180
> [   21.598294]  driver_probe_device+0x44/0x120
> [   21.598669]  __device_attach_driver+0xc4/0x168
> [   21.599063]  bus_for_each_drv+0x8c/0xf0
> [   21.599408]  __device_attach+0xa4/0x1c0
> [   21.599748]  device_initial_probe+0x1c/0x30
> [   21.600118]  bus_probe_device+0xb4/0xc0
> [   21.600462]  device_add+0x68c/0x888
> [   21.600775]  platform_device_add+0x19c/0x270
> [   21.601154]  platform_device_register_full+0xdc/0x178
> [   21.601602]  psci_idle_init+0xa0/0xc8
> [   21.601934]  do_one_initcall+0x60/0x290
> [   21.602275]  kernel_init_freeable+0x20c/0x3e0
> [   21.602664]  kernel_init+0x2c/0x1f8
> [   21.602979]  ret_from_fork+0x10/0x20

This doesn't make a lot of sense. "remote-endpoint" shouldn't be
related to anything to do with psci cpuidle. I'm guessing something
else is failing much earlier in boot that's indirectly causing this
somehow? Can you please take a look at what's failing earlier and let
us know? Or see what driver probe is failing up to this point but used
to work in the good case.

Also, where is the dts file that corresponds to this board in upstream? Is it
arch/arm64/boot/dts/rockchip/rk3588-rock-5b.dts

>
> > Also, can you give the output of <debugfs>/devices_deferred for the
> > good vs bad case?
>
> I can't provide you with requested output from the bad case, since the
> kernel never moves past this to an initramfs rescue shell, but following
> is the output from v6.8.1 (**with aforementioned patch reverted**).
>
> # cat /sys/kernel/debug/devices_deferred
> fc400000.usb    platform: wait for supplier /phy@...90000/usb3-port
> 1-0022  typec_fusb302: cannot register tcpm port
> fc000000.usb    platform: wait for supplier /phy@...80000/usb3-port
>
> It seems that v6.8.2 works _without needing to revert the patch_. I will
> have to look into this sometime this week but it seems like
> a8037ceb8964 (arm64: dts: rockchip: drop rockchip,trcm-sync-tx-only from rk3588 i2s)
> seems to be the one that fixed the root issue. I will have to test it
> sometime later this week.

Ok, once you find the patch that fixes things, let me know too.

-Saravana