linux-kernel - Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard interrupts

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Message-ID: <81cb16323baa1c81e7bc1e8156fa47b8@kernel.org>
Date:   Thu, 17 Sep 2020 09:45:56 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org, Sumit Garg <sumit.garg@...aro.org>,
        kernel-team@...roid.com, Florian Fainelli <f.fainelli@...il.com>,
        Russell King <linux@....linux.org.uk>,
        Jason Cooper <jason@...edaemon.net>,
        Saravana Kannan <saravanak@...gle.com>,
        Andrew Lunn <andrew@...n.ch>,
        Catalin Marinas <catalin.marinas@....com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Valentin Schneider <Valentin.Schneider@....com>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 08/16] irqchip/gic: Configure SGIs as standard
 interrupts

On 2020-09-17 08:54, Jon Hunter wrote:
> On 17/09/2020 08:50, Marc Zyngier wrote:
>> Hi Linus,
>> 
>> On 2020-09-17 08:40, Linus Walleij wrote:
>>> On Wed, Sep 16, 2020 at 5:11 PM Marc Zyngier <maz@...nel.org> wrote:
>>> 
>>>> Can you try the patch below and let me know?
>>> 
>>> I tried this patch and now Ux500 WORKS. So this patch is definitely
>>> something you should apply.
>>> 
>>>> -                       if (is_frankengic())
>>>> -                               set_sgi_intid(irqstat);
>>>> +                       this_cpu_write(sgi_intid, intid);
>>> 
>>> This needs changing to irqstat to compile as pointed out by Jon.
>>> 
>>> With that:
>>> Tested-by: Linus Walleij <linus.walleij@...aro.org>
>> 
>> Thanks a lot for that.
>> 
>> Still need to understand why some of Jon's systems are left 
>> unbootable,
>> despite having similar GIC implementations (Tegra194 and Tegra210 use
>> the same GIC-400, and yet only one of the two boots correctly...).
> 
> So far, I have only tested this patch on Tegra20. Let me try the other
> failing boards this morning and see if those still fail.

Tegra20 (if I remember well) is a dual A9 with the same GIC 
implementation
as Ux500, hence requiring the source CPU bits to be written back. So 
this
patch should have cured it, but didn't...

/me puzzled.

         M.
-- 
Jazz is not dead. It just smells funny...