linux-kernel - Re: [PATCH] of/irq: Add a quirk for controllers with their own definition of interrupt-map

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Date:   Tue, 23 Nov 2021 09:44:19 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        kernel-team@...roid.com, Rob Herring <robh@...nel.org>,
        John Crispin <john@...ozen.org>, Biwen Li <biwen.li@....com>,
        Chris Brandt <chris.brandt@...esas.com>,
        linux-renesas-soc@...r.kernel.org,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH] of/irq: Add a quirk for controllers with their own
 definition of interrupt-map

Hi Marc,

On Tue, Nov 23, 2021 at 9:33 AM Marc Zyngier <maz@...nel.org> wrote:
> On Tue, 23 Nov 2021 07:57:48 +0000,
> Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > Summarized:
> >   - Before the bad commit, and after your fix, irqc-rza1 is invoked,
> >     and the number of interrupts seen is correct, but input events
> >     are doubled.
> >   - After the bad commit, irqc-rza1 is not invoked, and there is an
> >     interrupt storm, but input events are OK.
>
> OK, that's reassuring, even if the "twice the events" stuff isn't what
> you'd expect. We at least know this is a separate issue, and that this
> patch on top of -rc1 brings you back to the 5.15 behaviour.
>
> I'd expect it to be the case for the other platforms as well.

OK.

BTW, what would have been the correct way to do this for irqc-rza1?
I think we're about to make the same mistake with RZ/G2L IRQC
support[1]?

Thanks!

[1] "[RFC PATCH v3 0/7] Renesas RZ/G2L IRQC support"
https://lore.kernel.org/all/20211110225808.16388-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds