linux-kernel - Re: [PATCH 18/18] arm64: dts: hikey: Convert to the hierarchical CPU topology layout

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Date:   Tue, 16 Jul 2019 15:47:44 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Mark Rutland <mark.rutland@....com>,
        linux-arm-kernel@...ts.infradead.org,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Raju P . L . S . S . S . N" <rplsssn@...eaurora.org>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Kevin Hilman <khilman@...nel.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Souvik Chakravarty <souvik.chakravarty@....com>,
        Sudeep Holla <sudeep.holla@....com>, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Xu <xuwei5@...ilicon.com>
Subject: Re: [PATCH 18/18] arm64: dts: hikey: Convert to the hierarchical CPU
 topology layout

On Mon, May 13, 2019 at 09:23:00PM +0200, Ulf Hansson wrote:
> To enable the OS to manage last-man standing activities for a CPU, while an
> idle state for a group of CPUs is selected, let's convert the Hikey
> platform into using the hierarchical CPU topology layout.
>
> Cc: Wei Xu <xuwei5@...ilicon.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
>
> Changes:
> 	- None.
>
> ---
>  arch/arm64/boot/dts/hisilicon/hi6220.dtsi | 87 ++++++++++++++++++++---
>  1 file changed, 76 insertions(+), 11 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> index 108e2a4227f6..36ff460f428f 100644
> --- a/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
> +++ b/arch/arm64/boot/dts/hisilicon/hi6220.dtsi
>  	cpus {

[...]

> @@ -70,9 +128,8 @@
>  			};
>
>  			CLUSTER_SLEEP: cluster-sleep {
> -				compatible = "arm,idle-state";
> -				local-timer-stop;
> -				arm,psci-suspend-param = <0x1010000>;
> +				compatible = "domain-idle-state";
> +				arm,psci-suspend-param = <0x1000000>;
>  				entry-latency-us = <1000>;
>  				exit-latency-us = <700>;
>  				min-residency-us = <2700>;

Again this must be original format and as per PSCI spec, your patch
changes this cluster sleep state into cluster retention state which I
think is not what you intended.

--
Regards,
Sudeep