Raspberry Pi -- no freq scaling on archlinuxarm's kernel 5.4

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Raspberry Pi -- no freq scaling on archlinuxarm's kernel 5.4

Postby zertyz » Fri May 29, 2020 11:12 pm

Hi, friends.

I don't know if here is the right place to report this kind of problem (kernel related) -- please direct me if not.

the new 5.4.? kernels (ArchLinux version) don't allow the CPU & friends to scale up either on rPi 1 and rPi 2.

On rPi2 the issue is silent, but on rPi1, I get the following on dmesg, early on boot:

[ 9.512249] WARNING: CPU: 0 PID: 1 at drivers/cpufreq/cpufreq-dt.c:69 find_supply_name+0x84/0xa0
[ 9.517444] Modules linked in:
(...)
-- currently I am on 5.4.42-1-ARCH, but this also happened on 5.4.40.

and the rPi1 stays at:
[root@PinkPi ~]# /opt/vc/bin/vcgencmd measure_clock core
frequency(1)=250000000
[root@PinkPi ~]# /opt/vc/bin/vcgencmd measure_clock arm
frequency(48)=700074000

no metter what is the load -- despite my config.txt is:

# maximum turbo for rPi1
arm_freq=1000
gpu_freq=500
sdram_freq=600
over_voltage=6
over_voltage_sdram=6
initial_turbo=60

NOTE: this config works fine on kernels 4.19.x on rPi1 (and a similar one also works on rPi2).


I also posted on the Raspberry Pi kernel's git repository, where I attached the config.gz and dmesg -- https://github.com/raspberrypi/linux/issues/3637

... They said it is due to the kernel configs the ArchLinuxARM teams use...
zertyz
 
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