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Date:   Wed, 29 Nov 2023 17:46:43 +0900
From:   Youngmin Nam <youngmin.nam@samsung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     tomasz.figa@gmail.com, s.nawrocki@samsung.com,
        alim.akhtar@samsung.com, linus.walleij@linaro.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-gpio@vger.kernel.org,
        linux-kernel@vger.kernel.org, semen.protsenko@linaro.org
Subject: Re: [PATCH v2] pinctrl: samsung: add irq_set_affinity() for non
 wake up external gpio interrupt
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References: <CGME20231126091120epcas2p4a1320e3b0f9be8f8a0f575a322981d38@epcas2p4.samsung.com>
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On Wed, Nov 29, 2023 at 09:00:04AM +0100, Krzysztof Kozlowski wrote:
> On 29/11/2023 08:07, Youngmin Nam wrote:
> > On Tue, Nov 28, 2023 at 03:35:53PM -0600, Sam Protsenko wrote:
> >> On Tue, Nov 28, 2023 at 1:29 AM Krzysztof Kozlowski
> >> <krzysztof.kozlowski@linaro.org> wrote:
> >>>
> >>> On 28/11/2023 02:01, Youngmin Nam wrote:
> >>>> On Mon, Nov 27, 2023 at 10:54:56AM +0100, Krzysztof Kozlowski wrote:
> >>>>> On 26/11/2023 10:46, Youngmin Nam wrote:
> >>>>>> To support affinity setting for non wake up external gpio interrupt,
> >>>>>> add irq_set_affinity callback using irq number from pinctrl driver data.
> >>>>>>
> >>>>>> Before this patch, changing the irq affinity of gpio interrupt is not possible:
> >>>>>>
> >>>>>>     # cat /proc/irq/418/smp_affinity
> >>>>>>     3ff
> >>>>>>     # echo 00f > /proc/irq/418/smp_affinity
> >>>>>
> >>>>> Does this command succeed on your board?
> >>>>>
> >>>> Yes.
> >>>
> >>> Hm, fails all the time one mine.
> >>>
> >>
> >> I tried to test this patch on E850-96, and an attempt to write into
> >> smp_affinity (for some GPIO irq) also fails for me:
> >>
> >>     # echo f0 > smp_affinity
> >>     -bash: echo: write error: Input/output error
> >>
> >> When I add some pr_err() to exynos_irq_set_affinity(), I can't see
> >> those printed in dmesg. So I guess exynos_irq_set_affinity() doesn't
> >> get called at all. So the error probably happens before
> >> .irq_set_affinity callback gets called.
> >>
> >> Youngmin, can you please try and test this patch on E850-96? This
> >> board is already supported in upstream kernel. For example you can use
> >> "Volume Up" interrupt for the test, which is GPIO irq.
> >>
> > 
> > I intened this affinity setting would work only on *Non* Wakeup External Interrupt.
> > The "Volume Up" on E850-96 board is connected with "gpa0-7" and
> > that is Wakeup External interrupt so that we can't test the callback.
> > 
> > I couldn't find out a pin for the test on E850-96 board yet.
> > We can test if there is a usage of *Non" Wake up External Interrupt of GPIO
> > on E850-96 board.
> > 
> > Do you have any idea ?
> 
> Please test on any upstream platform or upstream your existing platform.
> I hesitate to take this change because I don't trust Samsung that this
> was tested on mainline kernel. OK, for sure 100% it was not tested on
> mainline, but I am afraid that differences were far beyond just missing
> platforms. Therefore the issue might or might not exist at all. Maybe
> issue is caused by other Samsung non-upstreamed code.
> 
> Best regards,
> Krzysztof

Sure. Let me find how to test on upstreamed device like E850-96 board.
> 
> 
> 

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