linux-kernel - Re: [PATCH 2/2] ARM: dts: exynos: Remove interrupts from DMC controller in Exynos5422

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Date:   Fri, 21 Aug 2020 08:32:14 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        "linux-samsung-soc@...r.kernel.org" 
        <linux-samsung-soc@...r.kernel.org>, willy.mh.wolff.ml@...il.com,
        k.konieczny@...sung.com, Chanwoo Choi <cw00.choi@...sung.com>,
        Bartłomiej Żołnierkiewicz 
        <b.zolnierkie@...sung.com>, chanwoo@...nel.org,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com,
        s.nawrocki@...sung.com, kgene@...nel.org
Subject: Re: [PATCH 2/2] ARM: dts: exynos: Remove interrupts from DMC
 controller in Exynos5422

On Fri, 21 Aug 2020 at 08:31, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Mon, 17 Aug 2020 at 19:17, Lukasz Luba <lukasz.luba@....com> wrote:
> >
> > Hi Krzysztof,
> >
> > On 8/17/20 4:50 PM, Krzysztof Kozlowski wrote:
> > > On Wed, Jul 08, 2020 at 04:34:20PM +0100, Lukasz Luba wrote:
> > >> The interrupts in Dynamic Memory Controller in Exynos5422 and Odroid
> > >> XU3-family boards are no longer needed. They have been used in order
> > >> to workaround some issues in scheduled work in devfreq. Now when the
> > >> devfreq framework design is improved, remove the interrupt driven
> > >> approach and rely on devfreq monitoring mechanism with fixed intervals.
> > >>
> > >> Reported-by: Willy Wolff <willy.mh.wolff.ml@...il.com>
> > >> Signed-off-by: Lukasz Luba <lukasz.luba@....com>
> > >> ---
> > >>   arch/arm/boot/dts/exynos5420.dtsi | 3 ---
> > >>   1 file changed, 3 deletions(-)
> > >
> > > I think the dependencies were merged so this can be safely applied
> > > without bisectability problems?
> >
> > I have created v2 of that fix and it got merged
> > via Chanwoo's tree, the commit 4fc9a0470d2dc37028
> > https://lkml.org/lkml/2020/7/10/1048
> >
> > That commit switched the driver default mode from 'irq driven' to
> > new devfreq monitoring mechanism. Furthermore, when the driver is
> > built as a module, you can try to use the 'irq mode', but for this
> > you would need the DT IRQs description (this $subject tries to remove).
> >
> > I would like to keep this IRQ mode for experimentation, as I
> > described in answers to Bartek's questions:
> > https://lkml.org/lkml/2020/7/14/315
> >
> > Unfortunately, I am quite busy and won't make any progress before the
> > LPC.
>
> None of these were the actual answer to my question, unless by "v2 of
> that fix and it got merged" means the dependencies?
>
> I'll drop it from the queue. Please resend if it is valid.

Agh, not drop, I mean postpone for the next cycle (this is v5.11).

Best regards,
Krzysztof