[Bug 249889] [cpufreq] does not seem to fully support AMD Ryzen 9 4900H

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249889

            Bug ID: 249889
           Summary: [cpufreq] does not seem to fully support AMD Ryzen 9
                    4900H
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: florian.millet at laposte.net

Created attachment 218282
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=218282&action=edit
dmesg output

Hello everyone,

It would seems that FreeBSD cpufreq driver does not yet fully support AMD Ryzen
9 4900H processor.
When doing a sysctl dev.cpu.0 on a FreeBSD current at svn revision r366130 it
shows :

root at laptop:~ # sysctl dev.cpu.0
dev.cpu.0.temperature: 51.0C
dev.cpu.0.cx_method: C1/hlt C2/io C3/io
dev.cpu.0.cx_usage_counters: 17638 0 929634
dev.cpu.0.cx_usage: 1.86% 0.00% 98.13% last 7510us
dev.cpu.0.cx_lowest: C8
dev.cpu.0.cx_supported: C1/1/1 C2/2/400 C3/3/350
dev.cpu.0.freq_levels: 3300/4021 1700/1615 1400/1277
dev.cpu.0.freq: 1400
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=ACPI0007 _UID=1 _CID=none
dev.cpu.0.%location: handle=\_SB_.PLTF.P000
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU
root at laptop:~ #

You can see that the cpu can go from 1400 Mhz to 3300 Mhz but it is supposed to
be capable to boost to 4400 Mhz (AMD specifications can be found here :
https://www.amd.com/en/products/apu/amd-ryzen-9-4900h).

during the boot I can see that cpufreq detects something :
hwpstate0: <Cool`n'Quiet 2.0> on cpu0

Is turbo mode implemented for Ryzen Zen 2 3rd gen CPUs ?

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