Kernel-7.1.y Supports GPU Max_Freq=1GHz But DTB Seems To Limit It To 850MHz

[JFLim1]

Hi @warpme,

Device: Opi5-Plus
OS: MiniArch-EOS
Noticed that the 7.1.2-1 or 7.1.3-2 can supports GPU Max_Freq Up to 1GHz

[alarm@opi5plus ~]$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
[alarm@opi5plus ~]$ uname -a
Linux opi5plus 7.1.3 #1 SMP PREEMPT Wed Jul 15 16:54:01 CEST 2026 aarch64 GNU/Linux

[alarm@opi5plus ~]$ cat /sys/class/devfreq/fb000000.gpu/max_freq
1000000000

But on actual use for example running "glmark2-es2-wayland" the max reported GPU Freq is 850MHz

[alarm@opi5plus ~]$ cat /sys/class/devfreq/fb000000.gpu/cur_freq
850000000

Your kernel on 7.1.2 or 7.1.3-2 on BerylliumOS boot up with dtb from MiniArch-EOS, running "glmark2-es2-wayland" the max reported GPU Freq is also 850MHz.

But if for example, on BerylliumOS with your kernel-7.1.2/7.1.3 and dtb from 7.1.3-edge-rockchip64, running "glmark2-es2-wayland" the max reported GPU Freq is 1GHz, the glmark2-es2-wayland score also reflects a much higher score.

Unfortunately on MiniArch-EOS when I tried to swap the dtb to form 7.1.3-edge-rockchip64 it won't boot up, Opi5-Plus power LED turn solid Green and stuck with "_" on screen & pequin logo.

Wonder any other RK3588 users on MiniArch-EOS is facing the same GPU 850MHz.

[warpme]

well - in mine random rk3588 dev i'm getting:

cat /sys/class/devfreq/fb000000.gpu/available_frequencies
300000000 400000000 500000000 600000000 700000000 800000000 900000000 1000000000

what you getting on your system?

[JFLim1]

Hi @warpme,

My MiniArch-EOS-opi5plus-kde-7.1.3 same as yours:

[alarm@opi5plus ~]$ cat /sys/class/devfreq/fb000000.gpu/available_frequencies
300000000 400000000 500000000 600000000 700000000 800000000 900000000 1000000000
[alarm@opi5plus ~]$ 

Where cat /sys/class/devfreq/fb000000.gpu/max_freq also indicates 1000000000

[alarm@opi5plus ~]$ cat /sys/class/devfreq/fb000000.gpu/max_freq
1000000000
[alarm@opi5plus ~]$ 

But when you run "glmark2-es2-wayland" on MiniArch-EOS-opi5plus-kde-7.1.3 the maximum "cat /sys/class/devfreq/fb000000.gpu/cur_freq" reported is 850000000 only haven't seen it going up to 1000000000 before.

With your kernel-7.1.2/7.1.3 on BerylliumOS using your "dtb" the maximum "cat /sys/class/devfreq/fb000000.gpu/cur_freq" reported is also 850000000 when running "glmark2-es2-wayland".

On BerylliumOS with your kernel-7.1.2/7.1.3 boot up with dtb from kernel-7.1.3-edge-rockchip64, when running "glmark2-es2-wayland" cat /sys/class/devfreq/fb000000.gpu/cur_freq reports 1000000000.

Looks like is dtb related.

[warpme]

In 7.2 kernel added overlay dtbo enabling higher gpu clocks.
it is rockchip-rk3588-gpu-opp-allow-1ghz-opp-at-low-bins.dtbo
you can enable it in extlinux.conf by adding

FDTOVERLAYS /dtbs/rockchip/overlay/rockchip-rk3588-gpu-opp-allow-1ghz-opp-at-low-bins.dtbo

you you see on uart is is loaded by uboot at boot time