linux-kernel - Re: [PowerPC] [PASEMI] Issue with the identification of ATA drives after the of/irq updates 2024-05-29

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Message-ID: <ccf14173-9818-44ef-8610-db2900c67ae8@xenosoft.de>
Date: Thu, 4 Jul 2024 06:10:46 +0200
From: Christian Zigotzky <chzigotzky@...osoft.de>
To: Marc Zyngier <maz@...nel.org>
Cc: Rob Herring <robh@...nel.org>, apatel@...tanamicro.com,
 DTML <devicetree@...r.kernel.org>,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
 mad skateman <madskateman@...il.com>, "R.T.Dickinson" <rtd2@...a.co.nz>,
 Matthew Leaman <matthew@...on.biz>, Darren Stevens
 <darren@...vens-zone.net>, Christian Zigotzky <info@...osoft.de>
Subject: Re: [PowerPC] [PASEMI] Issue with the identification of ATA drives
 after the of/irq updates 2024-05-29

On 02.07.24 18:54, Marc Zyngier wrote:
> On Sun, 30 Jun 2024 11:21:55 +0100,
> Christian Zigotzky <chzigotzky@...osoft.de> wrote:
>> Hello,
>>
>> There is an issue with the identification of ATA drives with our
>> P.A. Semi Nemo boards [1] after the
>> commit "of/irq: Factor out parsing of interrupt-map parent
>> phandle+args from of_irq_parse_raw()" [2].
> [snip]
>
> My earlier request for valuable debug information still stands. But
> while you're at it, can you please give the following hack a go?
>
> 	M.
>
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -282,8 +282,10 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
>   
>   			oldimap = imap;
>   			imap = of_irq_parse_imap_parent(oldimap, imaplen, out_irq);
> -			if (!imap)
> -				goto fail;
> +			if (!imap) {
> +				match = 0;
> +				break;
> +			}
>   
>   			match &= of_device_is_available(out_irq->np);
>   			if (match)
>
> This may not be the final workaround even if it solves your boot
> problem, but will at least give us a hint at what is going wrong.
>
> I have the fuzzy feeling that we may be able to lob this broken system
> as part of the of_irq_imap_abusers[] array, which would solve things
> pretty "neatly".
>
> 	M.
>
We tested this patch yesterday and it solves the boot problem.

Thanks