From 9f68620fa72225971f162453740a65e3cdaf3ba9 Mon Sep 17 00:00:00 2001 From: bomilkar Date: Mon, 18 Sep 2023 22:48:51 +0200 Subject: [PATCH] relax CPU clock and voltage constraints to provide higher performance, lower power and still prevent system freeze --- ...004-Set-minimum-CPU-voltage-to-1.3V.patch} | 22 ++++++++++--------- .../linux/linux-openvario_6.3.8.bb | 2 +- .../fix-cpu-freq/files/fix_cpu_freq.sh | 10 ++++----- 3 files changed, 17 insertions(+), 17 deletions(-) rename meta-ov/recipes-kernel/linux/files/{0004-Set-minimum-CPU-voltage-to-1.2V.patch => 0004-Set-minimum-CPU-voltage-to-1.3V.patch} (74%) diff --git a/meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.2V.patch b/meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.3V.patch similarity index 74% rename from meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.2V.patch rename to meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.3V.patch index e0c4962..b488b9f 100644 --- a/meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.2V.patch +++ b/meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.3V.patch @@ -1,10 +1,10 @@ From 7d460400702a323c3dc796f95ce5e155767c0aca Mon Sep 17 00:00:00 2001 From: Torsten Beyer Date: Sun, 28 Aug 2022 20:04:45 +0200 -Subject: [PATCH] Set minimum CPU voltage to 1.2V +Subject: [PATCH] Set minimum CPU voltage to 1.3V The cubieboard2 dev spec says minimum voltage for lower frequencies should be 1.0iV and 1.1V respectively. Usage of cubieboards in OpenVarion -show instable behaviour with voltages of 1.0V and 1.1V. Hence this change increases CPU voltage to 1.2V for the lowest CPU speeds. +show instable behaviour with voltages of 1.0V and 1.1V. Hence this change increases CPU voltage to 1.3V for the lowest CPU speeds. --- arch/arm/boot/dts/sun7i-a20.dtsi | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) @@ -16,26 +16,28 @@ index 5574299685ab..6902621d806f 100644 @@ -112,9 +112,9 @@ <912000 1400000>, <864000 1300000>, - <720000 1200000>, +- <720000 1200000>, - <528000 1100000>, - <312000 1000000>, - <144000 1000000>; -+ <528000 1200000>, -+ <312000 1200000>, -+ <144000 1200000>; ++ <720000 1300000>, ++ <528000 1300000>, ++ <312000 1300000>, ++ <144000 1300000>; #cooling-cells = <2>; }; @@ -130,9 +130,9 @@ <912000 1400000>, <864000 1300000>, - <720000 1200000>, +- <720000 1200000>, - <528000 1100000>, - <312000 1000000>, - <144000 1000000>; -+ <528000 1200000>, -+ <312000 1200000>, -+ <144000 1200000>; ++ <720000 1300000>, ++ <528000 1300000>, ++ <312000 1300000>, ++ <144000 1300000>; #cooling-cells = <2>; }; }; diff --git a/meta-ov/recipes-kernel/linux/linux-openvario_6.3.8.bb b/meta-ov/recipes-kernel/linux/linux-openvario_6.3.8.bb index 4c8cbcc..68daab7 100644 --- a/meta-ov/recipes-kernel/linux/linux-openvario_6.3.8.bb +++ b/meta-ov/recipes-kernel/linux/linux-openvario_6.3.8.bb @@ -36,7 +36,7 @@ SRC_URI = " \ " SRC_URI:append:sunxi = " \ - file://0004-Set-minimum-CPU-voltage-to-1.2V.patch\ + file://0004-Set-minimum-CPU-voltage-to-1.3V.patch\ \ file://openvario-common.dts \ file://openvario-43-rgb.dts \ diff --git a/meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.sh b/meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.sh index f934194..c4ba1f6 100644 --- a/meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.sh +++ b/meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.sh @@ -1,14 +1,12 @@ #!/bin/bash # -# This script fixes CPU frequency thus effectively stopping the kernel from changing cpu frequency -# You can change the frequency if you wish. To do so just change the value of CPU_FIX_FREQ to a different -# number. Beware: it must be a supported frequency +# This script limits CPU frequency. +# Together with the changes to sun7i-a20.dtsi it prevents voltage changes in +# available frequency range. Beware: it must be a supported frequency # -CPU_FIX_FREQ=720000 +CPU_FIX_FREQ=864000 -echo $CPU_FIX_FREQ > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq echo $CPU_FIX_FREQ > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq -echo $CPU_FIX_FREQ > /sys/devices/system/cpu/cpu1/cpufreq/scaling_min_freq echo $CPU_FIX_FREQ > /sys/devices/system/cpu/cpu1/cpufreq/scaling_max_freq -- 2.30.2