SK-AM62: AM62 SK EVM showing CPU freqency

Please also check if the below setting is correct for 1.4G.

opp-1250000000 {
opp-hz = /bits/ 64 <1250000000>;
opp-supported-hw = <0x01 0x0004>;
clock-latency-ns = <6000000>;
};
//
/* Add 1.4GHz OPP for am625-sk board. Requires VDD_CORE to be at 0.85V */
opp-1400000000 {
opp-hz = /bits/ 64 <1400000000>;
opp-supported-hw = <0x01 0x0004>;
clock-latency-ns = <6000000>;
};

Rio,

Rio Chan said:

#1. The original SDK8.6 is not showing the Max 1.4G.

      So, we add this patch:    arm64: ti: dts: move 1.4GHZ OPP table to k3-am625

What is the "original" SDK8.6 you refer to? The SDK8.6 on ti.com already has this patch:

dev@ula:linux-5.10.168+gitAUTOINC+2c23e6c538-g2c23e6c538$ glog | grep 'move 1.4GHZ OPP table'
b57d377549f2 arm64: ti: dts: move 1.4GHZ OPP table to k3-am625

Hi Bin:

Customer has tested the SDK8.6 with that patch.

But, they are complaining the below cmd will give them 1.25G, not 1.4G.

-->

By issuing this cmd: cat /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq  , we still got this 1250000

How to solve this?

BR Rio

Hi Bin:

I have AM62 AI demo image from Reese: 

 --> https://tidrive.itg.ti.com/a/ZfSg85t0oOZ39KDA/65b82ce0-dd50-4e28-8dbf-cbe45e5450b8?l

This image proves the 1.4G is working.

May you share the entire working patch for this 1.4G?

BR Rio

root@am62xx-evm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
1400000
root@am62xx-evm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq
200000
root@am62xx-evm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
200000 400000 600000 800000 1000000 1250000 1400000
root@am62xx-evm:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors

Hi Bin:

Let me make it short:

1. In the current SDK8.5/8.6, the CPU freq we issue the cat will not give us 1.4G.

-->the "cat /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_cur_freq  " will not give us 1.4G, instead it shows 1.25G.

2. But, using the image from Reese, the cat cmd will give us the 1.4G.

So, please share us the entire / complete patch for fixing this.

BR Rio

Hi Rio,

The SDK8.6 WIC image is https://dr-download.ti.com/software-development/software-development-kit-sdk/MD-PvdSyIiioq/08.06.00.42/tisdk-default-image-am62xx-evm.wic.xz 

Here is the SDK8.6 default WIC image on my SK-AM62 E2 board, it shows 1.4GHz. I am not sure why your board only runs at 1.25GHz:

root@am62xx-evm:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_governor
performance
root@am62xx-evm:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_cur_freq
1400000
root@am62xx-evm:/sys/devices/system/cpu/cpu0/cpufreq# uname -a
Linux am62xx-evm 5.10.168-g2c23e6c538 #1 SMP PREEMPT Fri Feb 24 05:59:04 UTC 2023 aarch64 aarch64 aarch64 GNU/Linux