[Bug 209430] dev.cpu.0.freq_levels are completely bogus on AMD APU

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209430

            Bug ID: 209430
           Summary: dev.cpu.0.freq_levels are completely bogus on AMD APU
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: info at dressmaker.ca
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

For AMD APU A10-6800K powerd reports:

dev.cpu.0.freq_levels: 4100/20802 3800/15963 3325/13967 3200/10235 2800/8955
2600/6400 2275/5600 2000/4015 1750/3513 1500/3011 1250/2509 1000/2007 750/1505
500/1003 250/501

In reality this APU only supports the following P-States:

P-State FID 0x1C - VID 0x12 - IDD 19 (22.00x - )
P-State FID 0x1B - VID 0x18 - IDD 21 (21.50x - )
P-State FID 0x1A - VID 0x20 - IDD 19 (21.00x - )
P-State FID 0x19 - VID 0x26 - IDD 16 (20.50x - )
P-State FID 0x16 - VID 0x34 - IDD 13 (19.00x - )
P-State FID 0x10 - VID 0x46 - IDD 9 (16.00x - )
P-State FID 0xA - VID 0x58 - IDD 6 (13.00x - )
P-State FID 0x4 - VID 0x68 - IDD 4 (10.00x - ) 

i.e. the range of possible frequencies must be from 2000 Mhz to 4400 Mhz and
the top 3 are turbo-boost so cannot be set in OS.

So it is 4100, 3800, 3600, 3200, 2600, 2000.

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