diff options
Diffstat (limited to '0001-arm64-dts-allwinner-a64-h5-Add-CPU-idle-states.patch')
| -rw-r--r-- | 0001-arm64-dts-allwinner-a64-h5-Add-CPU-idle-states.patch | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/0001-arm64-dts-allwinner-a64-h5-Add-CPU-idle-states.patch b/0001-arm64-dts-allwinner-a64-h5-Add-CPU-idle-states.patch deleted file mode 100644 index 7aa451f..0000000 --- a/0001-arm64-dts-allwinner-a64-h5-Add-CPU-idle-states.patch +++ /dev/null @@ -1,157 +0,0 @@ -From 4c8fb634216bf73fac117436e1b936557dc97793 Mon Sep 17 00:00:00 2001 -From: Samuel Holland <samuel@sholland.org> -Date: Sat, 13 Mar 2021 23:54:25 -0600 -Subject: [PATCH] arm64: dts: allwinner: a64/h5: Add CPU idle states - -Powering off idle CPUs saves about 30 mW compared to using WFI only. -Additional power savings are possible by idling the L2 and downclocking -the cluster when all CPUs are idle. - -Entry and exit latency were measured using a logic analyzer, with GPIO -pins toggled in Linux after the calls to trace_cpu_idle() in -cpuidle_enter_state(), and in the power management firmware after CPU -power-off completes and immediately after detecting an interrupt. - -800 us and 1500 us are worst-case values, largely driven by the fact -that the power management firmware is single threaded. It can only -handle commands to power off CPUs one at a time, and it cannot process -any commands while powering on a CPU in response to an interrupt. - -The cluster suspend process reliably takes 36 us; I rounded this up to -50 us. If all CPUs enter the cluster idle state at the same time, exit -latency is actually reduced, because there is no contention in that -case. However, if only some CPUs enter the cluster idle state, behavior -is the same as for CPU idle. - -Polling delay for the power management firmware to detect a pending -interrupt is insignificant; it is less than 20 us. - -min-residency was chosen as the point where enabling the idle state -consumed no more average power than disabling the idle state at a -variety of interrupt rates. - -Signed-off-by: Samuel Holland <samuel@sholland.org> ---- - arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 26 +++++++++++++++++++ - arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi | 26 +++++++++++++++++++ - 2 files changed, 52 insertions(+) - -diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi -index cac47cc50..83b198d12 100644 ---- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi -+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi -@@ -61,6 +61,7 @@ cpu0: cpu@0 { - clocks = <&ccu CLK_CPUX>; - clock-names = "cpu"; - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu1: cpu@1 { -@@ -72,6 +73,7 @@ cpu1: cpu@1 { - clocks = <&ccu CLK_CPUX>; - clock-names = "cpu"; - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu2: cpu@2 { -@@ -83,6 +85,7 @@ cpu2: cpu@2 { - clocks = <&ccu CLK_CPUX>; - clock-names = "cpu"; - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu3: cpu@3 { -@@ -94,6 +97,29 @@ cpu3: cpu@3 { - clocks = <&ccu CLK_CPUX>; - clock-names = "cpu"; - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; -+ }; -+ -+ idle-states { -+ entry-method = "psci"; -+ -+ cpu_sleep: cpu-sleep { -+ compatible = "arm,idle-state"; -+ local-timer-stop; -+ entry-latency-us = <800>; -+ exit-latency-us = <1500>; -+ min-residency-us = <25000>; -+ arm,psci-suspend-param = <0x00010003>; -+ }; -+ -+ cluster_sleep: cluster-sleep { -+ compatible = "arm,idle-state"; -+ local-timer-stop; -+ entry-latency-us = <850>; -+ exit-latency-us = <1500>; -+ min-residency-us = <50000>; -+ arm,psci-suspend-param = <0x01010013>; -+ }; - }; - - L2: l2-cache { -diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi -index 62952660b..975a76a9f 100644 ---- a/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi -+++ b/arch/arm64/boot/dts/allwinner/sun50i-h5.dtsi -@@ -24,6 +24,7 @@ cpu0: cpu@0 { - clocks = <&ccu CLK_CPUX>; - clock-latency-ns = <244144>; /* 8 32k periods */ - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu1: cpu@1 { -@@ -34,6 +35,7 @@ cpu1: cpu@1 { - clocks = <&ccu CLK_CPUX>; - clock-latency-ns = <244144>; /* 8 32k periods */ - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu2: cpu@2 { -@@ -44,6 +46,7 @@ cpu2: cpu@2 { - clocks = <&ccu CLK_CPUX>; - clock-latency-ns = <244144>; /* 8 32k periods */ - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; - }; - - cpu3: cpu@3 { -@@ -54,6 +57,29 @@ cpu3: cpu@3 { - clocks = <&ccu CLK_CPUX>; - clock-latency-ns = <244144>; /* 8 32k periods */ - #cooling-cells = <2>; -+ cpu-idle-states = <&cpu_sleep>, <&cluster_sleep>; -+ }; -+ -+ idle-states { -+ entry-method = "psci"; -+ -+ cpu_sleep: cpu-sleep { -+ compatible = "arm,idle-state"; -+ local-timer-stop; -+ entry-latency-us = <800>; -+ exit-latency-us = <1500>; -+ min-residency-us = <25000>; -+ arm,psci-suspend-param = <0x00010003>; -+ }; -+ -+ cluster_sleep: cluster-sleep { -+ compatible = "arm,idle-state"; -+ local-timer-stop; -+ entry-latency-us = <850>; -+ exit-latency-us = <1500>; -+ min-residency-us = <50000>; -+ arm,psci-suspend-param = <0x01010013>; -+ }; - }; - }; - --- -2.39.0 - |