Warning message "VI should always have 2 performance levels" continuously repeat in the system log

Brief summary of the problem:

The following messages keep appearing in the system log every 10 seconds or so:

amdgpu: VI should always have 2 performance levels
[drm] PCIE GART of 256M enabled (table at 0x000000F400000000).
amdgpu: can't get the mac of 5

I have no idea what is about, but it is not something new. I noticed this happening on older kernel versions too.

Hardware description:

• CPU: AMD A12-9720P RADEON R7
• GPU: 00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Wani [Radeon R5/R6/R7 Graphics] [1002:9874] (rev c8)
• System Memory: 16GB

System information:

• Distro name and Version: Debian bookworm/sid
• Kernel version: 5.16.1 SMP PREEMPT