Adjusting core/memory clocks via the sysfs is broken in kernel 5.9

Brief summary of the problem:

Setting core/memory clocks and voltages via the sysfs fails with "Invalid Argument" error.

Hardware description:

• CPU: AMD Threadripper 3960X
• GPU: AMD Radeon VII x4
• System Memory: 128GB (8x 16GB Micron ECC UDIMM)
• Display(s): 3
• Type of Diplay Connection: 2x DP, HDMI

System infomration:

• Distro name and Version: Arch Linux
• Kernel version: 5.9.0
• Custom kernel: n/a

How to reproduce the issue:

Attempt to write new values to pp_od_clck_voltage

echo "vc 2 2025 1195" | sudo tee pp_od_clk_voltage
tee: write error : Invalid Argument

Errors occur whether writing to relative or fully qualified paths. I went back through the 5.9-rc kernels, and it looks like this has been broken since 5.9-rc1. Writes in hwmon (power_cap, fan, etc) and loading a new pp_table work without issue.

No issues with clock controls running the amd-staging-drm-next kernel.

Does reverting 9cb268215dbb186f4eaed589bda1a7a50ccabdc8 fix the issue? That revert seems to have not made it to 5.9.

Reverting commit 9cb268215dbb186f4eaed589bda1a7a50ccabdc8 fixes the problem in the 5.9 kernel.

I should have double checked that before filing the bug report, since I knew about it from the 5.8rc kernels.

I've sent the revert to 5.9 stable. Should be applied soon.

closed