[Bug 225782] Ryzen: unable to set cpu freq

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225782

            Bug ID: 225782
           Summary: Ryzen: unable to set cpu freq
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rozhuk.im at gmail.com

After boot was:
dev.hwpstate.0.freq_settings: 3500/-1 3500/-1 1550/-1
dev.cpu.0.freq_levels: 3500/-1 3500/-1 1550/-1
dev.cpu.0.freq: 1550

After set:
dev.cpu.0.freq=3500
perfomance degraded to ~50%

Returning dev.cpu.0.freq=1550 does not help with performance.
11.1-STABLE FreeBSD 11.1-STABLE  r328439M  amd64
Ryzen 1300X, no overclock, fixed freq and Voltage in BIOS.

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