Merge pull request #334 from tb59427/OV-stability-fixes

OV stability fixes

meta-ov/recipes-core/images/openvario-base-image.bb

@@ -46,6 +46,7 @@ IMAGE_INSTALL = " \
     ts-uinput-service \
     ${COMMON_WIFI_FIRMWARE_PACKAGES} \
     ${LOCALE_PACKAGES} \
+    fix-cpu-freq\
 "
 
 #                    packagegroup-base packagegroup-core-ssh-openssh 

meta-ov/recipes-kernel/linux/files/0004-Set-minimum-CPU-voltage-to-1.2V.patch

@@ -0,0 +1,44 @@
+From 7d460400702a323c3dc796f95ce5e155767c0aca Mon Sep 17 00:00:00 2001
+From: Torsten Beyer <[email protected]>
+Date: Sun, 28 Aug 2022 20:04:45 +0200
+Subject: [PATCH] Set minimum CPU voltage to 1.2V
+
+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.
+---
+ arch/arm/boot/dts/sun7i-a20.dtsi | 12 ++++++------
+ 1 file changed, 6 insertions(+), 6 deletions(-)
+
+diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
+index 5574299685ab..6902621d806f 100644
+--- a/arch/arm/boot/dts/sun7i-a20.dtsi
++++ b/arch/arm/boot/dts/sun7i-a20.dtsi
+@@ -112,9 +112,9 @@
+ 				<912000	1400000>,
+ 				<864000	1300000>,
+ 				<720000	1200000>,
+-				<528000	1100000>,
+-				<312000	1000000>,
+-				<144000	1000000>;
++				<528000	1200000>,
++				<312000	1200000>,
++				<144000	1200000>;
+ 			#cooling-cells = <2>;
+ 		};
+
+@@ -130,9 +130,9 @@
+ 				<912000	1400000>,
+ 				<864000	1300000>,
+ 				<720000	1200000>,
+-				<528000	1100000>,
+-				<312000	1000000>,
+-				<144000	1000000>;
++				<528000	1200000>,
++				<312000	1200000>,
++				<144000	1200000>;
+ 			#cooling-cells = <2>;
+ 		};
+ 	};
+-- 
+2.15.0
+

meta-ov/recipes-kernel/linux/linux-openvario_6.0.5.bb

@@ -36,7 +36,7 @@ SRC_URI = " \
 "
 
 SRC_URI:append:sunxi = " \
-	file://0004-1.1V-fix-for-sun7i-a20.dtsi.patch\
+	file://0004-Set-minimum-CPU-voltage-to-1.2V.patch\
 	\
 	file://openvario-common.dts \
 	file://openvario-43-rgb.dts \

meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.service

@@ -0,0 +1,10 @@
+[Unit]
+Description=Script to fix cpu_freq_min=cpu_freq_max for cpu0/1 to stop cpu_freq from switching frequencies
+
+[Service]
+Type=simple
+RemainAfterExit=yes
+ExecStart=/opt/bin/fix_cpu_freq.sh
+
+[Install]
+WantedBy=default.target

meta-ov/recipes-support/fix-cpu-freq/files/fix_cpu_freq.sh

@@ -0,0 +1,14 @@
+#!/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
+#
+
+CPU_FIX_FREQ=720000
+
+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

meta-ov/recipes-support/fix-cpu-freq/fix-cpu-freq_0.1.bb

@@ -0,0 +1,38 @@
+#
+# install fix_cpu_freq service into systemd
+# this this service runs /opt/bin/fix_cpu_freq.sh which fixes the CPU frequency at 720MHz
+# this has proven to make OV very stable and reliable
+# if you like to fix CPU speed at higher frequencies or want to allow frequency hopping for certain frequencies, change the settings in fix_cpu_freq.sh
+#
+
+SUMMARY = "Set CPU frequency to fixed value"
+LICENSE = "GPL-3.0-only"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/${LICENSE};md5=c79ff39f19dfec6d293b95dea7b07891"
+
+PR = "r1"
+
+inherit allarch systemd
+
+RDEPENDS:${PN} = " \
+        bash \
+"
+
+SRC_URI = " \
+        file://fix_cpu_freq.service \
+	file://fix_cpu_freq.sh \
+"
+
+do_install() {
+  install -d ${D}/${systemd_unitdir}/system
+  install -d ${D}/opt/bin
+  install -m 0644 ${WORKDIR}/fix_cpu_freq.service ${D}/${systemd_unitdir}/system
+  install -m 0755 ${WORKDIR}/fix_cpu_freq.sh ${D}/opt/bin
+}
+
+SYSTEMD_AUTO_ENABLE = "enable"
+SYSTEMD_SERVICE:${PN} = "fix_cpu_freq.service"
+
+FILES:${PN} += " \
+        ${systemd_unitdir}/system/fix_cpu_freq.service \
+	/opt/bin/fix_cpu_freq.sh \
+"