linux-raspberrypi: stop setting powersave as the default CPU governor

* The defconfigs from the RPi Kernel set `powersave` as the default CPU governor, which is a bad idea as that reduces performance by setting the CPU frequency to the minimum one. * In case of a Yocto build user-space is not configured by default to change the CPU governor, so `powersave` will remain the CPU governor and it will slow down everything. * I submitted a fix for those defconfigs to upstream here: raspberrypi/linux#5666 However, we shouldn't wait until that is accepted and backported to all the stable branches (if ever is). * This patch unsets the selection of `powersave` as the default CPU governor. * Then the CPU governor that will be selected as default after this patch will be the Linux's default one that is either `ondemand` or `schedutil` depending on the Kernel version. Signed-off-by: Carlos Alberto Lopez Perez <[email protected]>
agherzan · Nov 16, 2023 · f9af665 · f9af665
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diff --git a/recipes-kernel/linux/files/default-cpu-governor.cfg b/recipes-kernel/linux/files/default-cpu-governor.cfg
@@ -0,0 +1,9 @@
+# The defconfigs from the RPi Kernel set "powersave" as the default CPU governor.
+# That is a bad idea as it reduces performance, so we unset that default option here.
+# The option to build the powersave governor (but not as the default) is also enabled.
+# A fix for this was sent to upstream: https://github.com/raspberrypi/linux/pull/5666
+# However, we need to carry this option override until those defconfigs are fixed on
+# *all* the kernel branches that we support. So that can be a long time depending
+# on wheter the above PR gets accepted and/or backported to the stable branches.
+CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE=n
+CONFIG_CPU_FREQ_GOV_POWERSAVE=y
diff --git a/recipes-kernel/linux/linux-raspberrypi.inc b/recipes-kernel/linux/linux-raspberrypi.inc
@@ -15,6 +15,7 @@ SRC_URI += " \
     ${@bb.utils.contains("INITRAMFS_IMAGE_BUNDLE", "1", "file://initramfs-image-bundle.cfg", "", d)} \
     ${@bb.utils.contains("MACHINE_FEATURES", "vc4graphics", "file://vc4graphics.cfg", "", d)} \
     ${@bb.utils.contains("MACHINE_FEATURES", "wm8960", "file://wm8960.cfg", "", d)} \
+    file://default-cpu-governor.cfg \
     "
 
 SRC_URI:append:raspberrypi4 = " \