linux-kernel - Re: [RFC PATCH 00/10] ARM: dts: exynos: Fix invalid GIC interrupt flags

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Message-ID: <20160918143021.GA9489@kozik-book>
Date:   Sun, 18 Sep 2016 16:30:21 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Alim Akhtar <alim.akhtar@...il.com>,
        Kukjin Kim <kgene@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alban Browaeys <alban.browaeys@...il.com>
Subject: Re: [RFC PATCH 00/10] ARM: dts: exynos: Fix invalid GIC interrupt
 flags

On Sun, Sep 18, 2016 at 10:34:36AM +0100, Marc Zyngier wrote:
> On Sat, 17 Sep 2016 19:55:53 +0200
> Krzysztof Kozlowski <krzk@...nel.org> wrote:
> 
> > On Sat, Sep 17, 2016 at 11:05:39PM +0530, Alim Akhtar wrote:
> > > Hi Krzysztof,
> > > 
> > > On Sat, Sep 17, 2016 at 1:12 AM, Krzysztof Kozlowski <krzk@...nel.org> wrote:  
> > > > Hi,
> > > >
> > > > Marek (internally), Geert and Alban reported errors like:
> > > >         genirq: Setting trigger mode 0 for irq 16 failed (gic_set_type+0x0/0x68)
> > > > The patchset fixes this issue.
> > > >
> > > > Tested on:
> > > > 1. Exynos4412: Odroid U3,
> > > > 2. Exynos5410: Odroid XU,
> > > > 3. Exynos5422: Odroid XU3.
> > > >  
> > > 
> > > Tested on Exynos5800 based peach-pi board, so fpr patch 06/10
> > > 
> > > Tested-by: Alim Akhtar <alim.akhtar@...sung.com>
> > > 
> > >   
> > > > Other platforms not tested so testing would be highly appreciated.
> > > >
> > > > Best regards,
> > > > Krzysztof
> > > >
> > > > Krzysztof Kozlowski (10):
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos4
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos4210
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos4x12
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos4415
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos3250
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos5
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos5250
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in
> > > >     exynos5410/exynos542x
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos5260
> > > >   ARM: dts: exynos: Fix invalid GIC interrupt flags in exynos5440
> > > >  
> > > 
> > > In general these patches looks good, feel free to add my review-by tag
> > > for this series.
> > > 
> > > Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
> > >   
> > 
> > Thanks, I'll add your reviewed-by to all patches.
> 
> There is a couple of things that I don't like about these patches:
> 
> - Are you sure that all your interrupts are level? I appreciate that's
>   a very common setting, but you seem to have simply decided that there
>   wasn't any edge interrupt. Is that a "Let's see what breaks"
>   situation? If so, It'd be good to state it.

Yes, that's the case. I can mention it in commit msg more explicitly.
Anyway till now, Exynos platform always used IRQ_TYPE_NONE. Also vendor
kernel uses it. However this did not affect the platform. I didn't dig
too much into it but it seemts that __irq_set_trigger wasn't called
before for these interrupts.

> 
> - You've used the IRQ_TYPE_LEVEL_HIGH macro everywhere, but didn't use
>   the GIC_SPI macro as the first argument of each interrupt specifier.
>   I'm by no mean a fan of these macros, but you should at least have
>   some consistency inside an interrupt specifier.

I wanted to fix here only the error itself. Using GIC_SPI instead of 0
is not related so I replaced it in separate patches [1]. Keeping such
change separate makes testing easy - dtx_diff.

Best regards,
Krzysztof

[1] https://patchwork.kernel.org/patch/9336781/