[Bug 248264] arm64 / RPi4: cpu frequency control stops working

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248264

            Bug ID: 248264
           Summary: arm64 / RPi4: cpu frequency control stops working
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gbe at FreeBSD.org

On a recent CURRENT from the 25th of July the cpu frequency control stops
working. During boot the following error messages are displayed,

bcm2835_cpufreq0: ARM 600MHz, Core 200MHz, SDRAM 400MHz, Turbo OFF
mbox0: mbox response error
bcm2835_cpufreq0: can't set clock rate (id=4)
mbox0: mbox response error
bcm2835_cpufreq0: can't set clock rate (id=8)

The result is that the CPUs are always at the highest clockrate, even if they
are idle.

dev.cpu.0.temperature: 47.0C
dev.cpu.0.freq_levels: 1500/-1 600/-1
dev.cpu.0.freq: 1500
dev.cpu.0.%parent: cpulist0
dev.cpu.0.%pnpinfo: name=cpu at 0 compat=arm,cortex-a72
dev.cpu.0.%location:
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: Open Firmware CPU

$ uname -a
FreeBSD tiny.0xfce3.net 13.0-CURRENT FreeBSD 13.0-CURRENT #14
cddea6e05fc-c270140(master): Sat Jul 25 16:18:11 CEST 2020    
root at tiny.0xfce3.net:/tank/nfs_public/tiny/obj/tank/nfs_public/tiny/src/arm64.aarch64/sys/GENERIC-TCP
 arm64

>From my memory, on a -CURRENT from about 14th of July the frequency control was
working as intended.

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