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

[bugzilla-daemon@bugzilla.kernel.org]

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

--- Comment #9 from Marko Srebre <bgz.marko@gmail.com> ---
I've been using enable_bapm for a day now, here are my observations:

* There are no issues regarding lockups. Not even when plugging/unplugging AC
adapter or sleeping/resuming.

* Boost state is active on boot regardless of AC begin plugged or not. However,
boost will get deactivated if at a later time AC is deplugged, and get
activated again on plugging. While this may make sense in some situations, I
prefer boost being always active, so for the time being I just changed the
relevant code so it's always on. I guess it would make sense for it to be an
option that could be tuned.

* There is some strange behaviour associated with this particular APU
(A6-1450). This is probably not Linux specific as I've seen reports on it for
Windows too. After boot turbo would only work for a single core and up to
1.3Ghz. But after doing a sleep/resume cycle turbo works for all 4 cores and up
to full 1.4Ghz (the difference is also quite audible since the fans go wild).
As if available TDP would somehow get much bigger after sleep/resume.

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