low mclock after some suspend cycles (was Re: Slower 3D with kernel 4.11.x)

[Daniel Mota Leite]

Hi again

> > OK, no powerplay messages that time. Was performance back to what you
> > expected ?  
> Yes, performance on 4.10.12 is what i call normal

	I was bisect the 4.11 kernel when 4.12 was released, and guess
what? The problem is fixed in 4.12, i can get normal performance in
vulkan again... but not all is perfect...

	After the kernel update to 4.12 and also a firmware update from
the distro, i see no errors on the dmesg (probably the most of the errors
were firmware related?), but i found that after several suspend cycled,
the GPU is locked in the lowest mclck and even the sclck seems to be
harder to increase.

	As per radeon-profile, the performance is still auto and even
trying to switch to high or manual makes no difference, mclck is locked on
the lower value.

	So something in the suspend *sometimes* lock GPU the power profile
on a lower state.

	I also found that even after boot, and switching to manual, i
can't decrease the mclock, at least it by default on the highest
setting, but i may point to some problem switching the mclck.
sclck i can manually change, so no problem there.

Thanks for all the mesa and amdgpu work
higuita
-- 
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leaders of a country who determine the policy, and it is always a 
simple matter to drag the people along, whether it is a democracy, or
a fascist dictatorship, or a parliament, or a communist dictatorship.
Voice or no voice, the people can always be brought to the bidding of
the leaders. That is easy. All you have to do is tell them they are 
being attacked, and denounce the pacifists for lack of patriotism and
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