linux-kernel - Re: [PATCH v14 01/18] irqchip/sifive-plic: Convert PLIC driver into a platform driver

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Message-ID: <CAAhSdy1pesbdTfWnFURMJRcy2ujjX+cXtt-cfLDj2CQf2Ua_gw@mail.gmail.com>
Date: Thu, 20 Jun 2024 09:19:56 +0530
From: Anup Patel <anup@...infault.org>
To: Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc: Anup Patel <apatel@...tanamicro.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand <frowand.list@...il.com>, 
	Conor Dooley <conor+dt@...nel.org>, Samuel Holland <samuel@...lland.org>, devicetree@...r.kernel.org, 
	Saravana Kannan <saravanak@...gle.com>, Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org, 
	Björn Töpel <bjorn@...nel.org>, 
	Atish Patra <atishp@...shpatra.org>, linux-riscv@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v14 01/18] irqchip/sifive-plic: Convert PLIC driver into a
 platform driver

On Wed, Jun 19, 2024 at 11:16 PM Emil Renner Berthing
<emil.renner.berthing@...onical.com> wrote:
>
> Anup Patel wrote:
> > On Tue, Jun 18, 2024 at 7:00 PM Emil Renner Berthing
> > <emil.renner.berthing@...onical.com> wrote:
> > >
> > > Anup Patel wrote:
> > > > The PLIC driver does not require very early initialization so convert
> > > > it into a platform driver.
> > > >
> > > > After conversion, the PLIC driver is probed after CPUs are brought-up
> > > > so setup cpuhp state after context handler of all online CPUs are
> > > > initialized otherwise PLIC driver crashes for platforms with multiple
> > > > PLIC instances.
> > > >
> > > > Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> > >
> > > Hi Anup,
> > >
> > > Sorry for the late reply to the mailing list, but ever since 6.9 where this was
> > > applied my Allwinner D1 based boards no longer boot. This is the log of my
> > > LicheeRV Dock booting plain 6.10-rc4, locking up and then rebooting due to the
> > > the watchdog timing out:
> > >
> > > https://pastebin.com/raw/nsbzgEKW
> > >
> > > On 6.10-rc4 I can bring the same board to boot by reverting this patch and all
> > > patches building on it. Eg.:
> > >
> > >   git revert e306a894bd51 a7fb69ffd7ce abb720579490 \
> > >              956521064780 a15587277a24 6c725f33d67b \
> > >              b68d0ff529a9 25d862e183d4 8ec99b033147
> >
> > Does your board boot with only SBI timer driver enabled ?
>
> I'm not 100% sure this is what you mean, but with this change I can disable
> CONFIG_SUN4I_TIMER:
>
> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
> index f51bb24bc84c..0143545348eb 100644
> --- a/arch/riscv/Kconfig.socs
> +++ b/arch/riscv/Kconfig.socs
> @@ -39,7 +39,6 @@ config ARCH_SUNXI
>         bool "Allwinner sun20i SoCs"
>         depends on MMU && !XIP_KERNEL
>         select ERRATA_THEAD
> -       select SUN4I_TIMER
>         help
>           This enables support for Allwinner sun20i platform hardware,
>           including boards based on the D1 and D1s SoCs.
>
>
> But unfortunately the board still doesn't boot:
> https://pastebin.com/raw/AwRxcfeu

I think we should enable debug prints in DD core and see
which device is not getting probed due to lack of a provider.

Just add "#define DEBUG" at the top in drivers/base/core.c
and boot again with "loglevel=8" kernel parameter (along with
the above change).

Regards,
Anup