* [PATCH v2] ARM: dts: mt8173: support arm64 cpuidle-dt
@ 2015-04-07 8:05 Howard Chen
2015-04-08 10:54 ` Lorenzo Pieralisi
0 siblings, 1 reply; 2+ messages in thread
From: Howard Chen @ 2015-04-07 8:05 UTC (permalink / raw)
To: Matthias Brugger
Cc: Rob Herring, Pawel Moll, Mark Rutland, Ian Campbell, Kumar Gala,
Catalin Marinas, Will Deacon, Howard Chen, Eddie Huang,
devicetree, linux-arm-kernel, linux-kernel, linux-mediatek,
srv_heupstream, Sascha Hauer
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>
---
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>;
};
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>;
+ };
};
};
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] ARM: dts: mt8173: support arm64 cpuidle-dt
2015-04-07 8:05 [PATCH v2] ARM: dts: mt8173: support arm64 cpuidle-dt Howard Chen
@ 2015-04-08 10:54 ` Lorenzo Pieralisi
0 siblings, 0 replies; 2+ messages in thread
From: Lorenzo Pieralisi @ 2015-04-08 10:54 UTC (permalink / raw)
To: Howard Chen
Cc: Matthias Brugger, Rob Herring, Pawel Moll, Mark Rutland,
Ian Campbell, Kumar Gala, Catalin Marinas, Will Deacon,
Eddie Huang, devicetree, linux-arm-kernel, linux-kernel,
linux-mediatek, srv_heupstream, Sascha Hauer
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
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2015-04-08 10:54 ` Lorenzo Pieralisi
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