linux-kernel - Re: [PATCH v1 0/9] Fix Allwinner D1 boot regression

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Message-ID: <CAJM55Z_qQX7n8tAeOFqrAH1BFjA9vaWA8rtsPG2BcKmiO88m=Q@mail.gmail.com>
Date: Thu, 15 Aug 2024 05:14:14 -0700
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Emil Renner Berthing <emil.renner.berthing@...onical.com>, 
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, Anup Patel <apatel@...tanamicro.com>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Samuel Holland <samuel.holland@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v1 0/9] Fix Allwinner D1 boot regression

Emil Renner Berthing wrote:
> Thomas Gleixner wrote:
> > On Thu, Aug 15 2024 at 03:29, Emil Renner Berthing wrote:
> > > Thomas Gleixner wrote:
> > > Thanks for looking at this! Unfortunately the above patch isn't enough to fix
> > > the issue:
> > >
> > > https://termbin.com/7sgc
> > >
> > > It still hangs after the "[    0.176451] cpuidle: using governor teo" message
> > > until the watchdog reboots the systems.
> >
> > So what's puzzling is that there is a timer installed early on:
> >
> > [    0.000000] clocksource: riscv_clocksource: ....
> >
> > That same init function installs the per cpu riscv clockevent, so there
> > should be a timer available.
> >
> > The deffered probing of the PLIC driver delays obviously the probing of
> > the sun4i timer, but that should not matter when another timer is
> > available. So the sun4i driver might be a red herring.
> >
> > Can you please add "ignore_loglevel initcall_debug" to the command line
> > and provide the output of a booting and a failing kernel?
>
> 6.11-rc3 + these reverts:  https://termbin.com/q6wk
> 6.11-rc3 + Samuel's patch: https://termbin.com/7cgs

I think this confirms what Charlie found here:
https://lore.kernel.org/linux-riscv/ZoydV7vad5JWIcZb@ghost/

>
> > And on the booting kernel please provide the output from:
> >
> > # cat /sys/devices/system/clockevents/clockevent0/current_device
> > # cat /sys/devices/system/clockevents/broadcast/current_device
> > # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
>
> On both a 6.8.6 kernel and 6.11-rc3 + reverts I get:
>
>   # cat /sys/devices/system/clockevents/clockevent0/current_device
>   sun4i_tick
>   # cat /sys/devices/system/clockevents/broadcast/current_device
>   riscv_timer_clockevent
>   # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
>   riscv_clocksource
>
> /Emil
>
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