linux-kernel - Re: [PATCH] arm64: dts: qcom: qcs404: Add PSCI cpuidle support

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Message-ID: <20190515103026.GA26759@e107155-lin>
Date:   Wed, 15 May 2019 11:30:46 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Amit Kucheria <amit.kucheria@...aro.org>
Cc:     Niklas Cassel <niklas.cassel@...aro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andy Gross <agross@...nel.org>,
        David Brown <david.brown@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
        Lina Iyer <lina.iyer@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH] arm64: dts: qcom: qcs404: Add PSCI cpuidle support

On Wed, May 15, 2019 at 03:26:14PM +0530, Amit Kucheria wrote:
> On Mon, May 13, 2019 at 3:19 PM Sudeep Holla <sudeep.holla@....com> wrote:
> >
> > On Fri, May 10, 2019 at 11:58:40PM +0530, Amit Kucheria wrote:
> > > On Fri, May 10, 2019 at 2:54 PM Sudeep Holla <sudeep.holla@....com> wrote:
> > > >
> >
> > [...]
> >
> > > >
> > > > Yes entry-method="psci" is required as per DT binding but not checked
> > > > in code on arm64. We have CPU ops with idle enabled only for "psci", so
> > > > there's not need to check.
> > >
> > > I don't see it being checked on arm32 either.
> > >
> >
> > arm_cpuidle_get_ops in arch/arm/kernel/cpuidle.c checks the method, has
> > to match "psci" for drivers/firmware/psci.c to work on arm32
>
> That is a check for the enable-method, not entry-method.
>
> We don't check for entry-method anywhere, AFAICT.
>

Ah, you right. My eyes can't distinguish between entry-method and enable-method
anymore :(

--
Regards,
Sudeep