From: Rob Herring <robh@kernel.org>
To: Marc Zyngier <maz@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
devicetree@vger.kernel.org,
Android Kernel Team <kernel-team@android.com>,
John Crispin <john@phrozen.org>, Biwen Li <biwen.li@nxp.com>,
Chris Brandt <chris.brandt@renesas.com>,
Geert Uytterhoeven <geert+renesas@glider.be>
Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map
Date: Mon, 29 Nov 2021 13:15:27 -0600 [thread overview]
Message-ID: <CAL_Jsq+kLK-277FOSvOCVDdw8_j-6xL-SnHs15Zj4MddsxZqNw@mail.gmail.com> (raw)
In-Reply-To: <20211122103032.517923-1-maz@kernel.org>
On Mon, Nov 22, 2021 at 4:30 AM Marc Zyngier <maz@kernel.org> wrote:
>
> Since 041284181226 ("of/irq: Allow matching of an interrupt-map local
> to an interrupt controller"), a handful of interrupt controllers have
> stopped working correctly. This is due to the DT exposing a non-sensical
> interrupt-map property, and their drivers relying on the kernel ignoring
> this property.
>
> Since we cannot realistically fix this terrible behaviour, add a quirk
> for the limited set of devices that have implemented this monster,
> and document that this is a pretty bad practice.
>
> Cc: Rob Herring <robh@kernel.org>
> Cc: John Crispin <john@phrozen.org>
> Cc: Biwen Li <biwen.li@nxp.com>
> Cc: Chris Brandt <chris.brandt@renesas.com>
> Cc: Geert Uytterhoeven <geert+renesas@glider.be>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> ---
> drivers/of/irq.c | 37 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 35 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index b10f015b2e37..27a5173c813c 100644
> --- a/drivers/of/irq.c
> +++ b/drivers/of/irq.c
> @@ -76,6 +76,36 @@ struct device_node *of_irq_find_parent(struct device_node *child)
> }
> EXPORT_SYMBOL_GPL(of_irq_find_parent);
>
> +/*
> + * These interrupt controllers abuse interrupt-map for unspeakable
> + * reasons and rely on the core code to *ignore* it (the drivers do
> + * their own parsing of the property).
> + *
> + * If you think of adding to the list for something *new*, think
> + * again. There is a high chance that you will be sent back to the
> + * drawing board.
> + */
> +static const char * const of_irq_imap_abusers[] = {
> + "CBEA,platform-spider-pic",
> + "sti,platform-spider-pic",
> + "realtek,rtl-intc",
> + "fsl,ls1021a-extirq",
> + "fsl,ls1043a-extirq",
> + "fsl,ls1088a-extirq",
> + "renesas,rza1-irqc",
> +};
I guess this list was obtained by with a: git grep '"interrupt-map"'
I suppose that should be sufficient to find all the cases. I'd like to
be able to identify this case just from a DT file, but it's not really
clear
Perhaps a simpler solution to all this is only handle interrupt-map
with interrupt-controller if it points to its own node. That works for
Apple and I don't see a need beyond that case.
> +static bool of_irq_abuses_interrupt_map(struct device_node *np)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(of_irq_imap_abusers); i++)
> + if (of_device_is_compatible(np, of_irq_imap_abusers[i]))
> + return true;
> +
> + return false;
With a NULL terminated list, you can use of_device_compatible_match() instead .
Rob
next prev parent reply other threads:[~2021-11-29 19:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-22 10:30 [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map Marc Zyngier
2021-11-22 13:10 ` Geert Uytterhoeven
2021-11-22 13:54 ` Marc Zyngier
2021-11-22 16:58 ` Geert Uytterhoeven
2021-11-23 7:57 ` Geert Uytterhoeven
2021-11-23 8:33 ` Marc Zyngier
2021-11-23 8:44 ` Geert Uytterhoeven
2021-11-23 9:11 ` Marc Zyngier
2021-11-24 7:54 ` Geert Uytterhoeven
2021-11-24 11:14 ` Marc Zyngier
2021-11-27 0:42 ` Prabhakar Mahadev Lad
2021-11-29 10:34 ` Marc Zyngier
2021-11-29 12:13 ` Lad, Prabhakar
2021-11-29 18:33 ` Rob Herring
2021-11-30 12:52 ` Lad, Prabhakar
2021-11-30 18:36 ` Marc Zyngier
2021-12-01 13:36 ` Lad, Prabhakar
2021-12-01 14:35 ` Rob Herring
2021-12-01 16:16 ` Lad, Prabhakar
2021-12-05 22:27 ` Lad, Prabhakar
2021-12-06 10:26 ` Marc Zyngier
2021-12-06 16:55 ` Lad, Prabhakar
2021-12-06 18:59 ` Rob Herring
2021-11-23 11:02 ` Geert Uytterhoeven
2021-11-23 8:40 ` Sander Vanheule
2021-11-23 9:12 ` Marc Zyngier
2021-11-29 19:15 ` Rob Herring [this message]
2021-11-29 19:31 ` Marc Zyngier
2021-11-29 19:40 ` Rob Herring
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