[Bug 78111] New: APU turbo core boost not working when radeon.dpm=1

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https://bugzilla.kernel.org/show_bug.cgi?id=78111

            Bug ID: 78111
           Summary: APU turbo core boost not working when radeon.dpm=1
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.14.6
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: bgz.marko@gmail.com
        Regression: No

I am testing with A6-1450 APU on Arch Linux. If I pass radeon.dpm=1 parameter
at boot and start a single core workload then turbostat will report max
frequency of about 1000 MHz:

    Core     CPU Avg_MHz Bzy_MHz TSC_MHz   time 
       -       -     262     998     998      5**
       0       0      12     998     998      5**
       1       1     998     998     998
       2       2      16     998     998
       3       3      21     998     998

"cpupower frequency-info" reports that boost state support is supported, but
not active:

  boost state support:
    Supported: yes
    Active: no


However, when dynamic power management is disabled (radeon.dpm=0), turbostat
reports higher frequencies for single core load, up to 1300 Mhz:

    Core     CPU Avg_MHz Bzy_MHz TSC_MHz   time 
       -       -     320    1214     998      5**
       0       0       9    1226     998      5**
       1       1      13    1194     998
       2       2      41    1143     998
       3       3    1216    1216     998

"cpupower frequency-info" confirms that boost is now active.

  boost state support:
    Supported: yes
    Active: yes

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