linux-kernel - Re: [RFC PATCH] arm64: dts: allwinner: a64/h5: Add CPU idle states

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Message-ID: <20210330101330.eaanzt5f3bhsn7df@bogus>
Date:   Tue, 30 Mar 2021 11:13:40 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Andre Przywara <andre.przywara@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev,
        linux-sunxi@...glegroups.com
Subject: Re: [RFC PATCH] arm64: dts: allwinner: a64/h5: Add CPU idle states

On Tue, Mar 23, 2021 at 11:44:50PM -0500, Samuel Holland wrote:
> 3) Modify the Linux PSCI client to respect PSCI_FEATURES when setting
>    psci_ops.cpu_suspend. cpuidle-psci checks for this function before
>    setting up idle states.

We don't call PSCI_FEATURES on mandatory functions as it may not return
anything meaningful for such mandatory functions(as that is not mandated
in the spec). In short NACK to add PSCI_FEATURES check for mandatory
functions.

--
Regards,
Sudeep