From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Howard Chen <howard.chen@linaro.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
Rob Herring <robh+dt@kernel.org>, Pawel Moll <Pawel.Moll@arm.com>,
Mark Rutland <Mark.Rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
Catalin Marinas <Catalin.Marinas@arm.com>,
Will Deacon <Will.Deacon@arm.com>,
Eddie Huang <eddie.huang@mediatek.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"srv_heupstream@mediatek.com" <srv_heupstream@mediatek.com>,
Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH v2] ARM: dts: mt8173: support arm64 cpuidle-dt
Date: Wed, 8 Apr 2015 11:54:43 +0100 [thread overview]
Message-ID: <20150408105443.GA23642@red-moon> (raw)
In-Reply-To: <1428393905-32166-1-git-send-email-howard.chen@linaro.org>
On Tue, Apr 07, 2015 at 09:05:05AM +0100, Howard Chen wrote:
> This patch adds an idle-states node to describe the mt8173 idle states and
> also adds references to the idle-states node in all CPU nodes.
>
> Signed-off-by: Howard Chen <howard.chen@linaro.org>
Is copying me in too much effort to ask ?
> arch/arm64/boot/dts/mediatek/mt8173.dtsi | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> index 8554ec3..0d31a34 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> @@ -48,6 +48,8 @@
> device_type = "cpu";
> compatible = "arm,cortex-a53";
> reg = <0x000>;
> + enable-method = "psci";
> + cpu-idle-states = <&CPU_SLEEP_0>;
Cluster idle state vanished between v1 and v2.
?
> };
>
> cpu1: cpu@1 {
> @@ -55,6 +57,7 @@
> compatible = "arm,cortex-a53";
> reg = <0x001>;
> enable-method = "psci";
> + cpu-idle-states = <&CPU_SLEEP_0>;
> };
>
> cpu2: cpu@100 {
> @@ -62,6 +65,7 @@
> compatible = "arm,cortex-a57";
> reg = <0x100>;
> enable-method = "psci";
> + cpu-idle-states = <&CPU_SLEEP_0>;
> };
>
> cpu3: cpu@101 {
> @@ -69,6 +73,19 @@
> compatible = "arm,cortex-a57";
> reg = <0x101>;
> enable-method = "psci";
> + cpu-idle-states = <&CPU_SLEEP_0>;
> + };
> +
> + idle-states {
> + entry-method = "arm,psci";
> +
> + CPU_SLEEP_0: cpu-sleep-0 {
> + compatible = "arm,idle-state";
> + arm,psci-suspend-param = <0x0010000>;
> + entry-latency-us = <639>;
> + exit-latency-us = <328>;
> + min-residency-us = <1088>;
> + };
> };
> };
Is the arch timer still running when you enter this state ?
Apart from these remarks the patch seems fine, I wonder whether we should
merge these changes into the kernel instead of keeping these changes in
firmware for specific kernel configurations.
Lorenzo
prev parent reply other threads:[~2015-04-08 10:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-07 8:05 [PATCH v2] ARM: dts: mt8173: support arm64 cpuidle-dt Howard Chen
2015-04-08 10:54 ` Lorenzo Pieralisi [this message]
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