[Intel-gfx] [PATCH 2/3] tests/pm_rps: vlv: load gpu for idle min/max tests

[Daniel Vetter]

On Thu, Dec 04, 2014 at 06:09:39PM +0200, Imre Deak wrote:
> When changing the sysfs GT min/max frequencies, the kernel won't
> explicitly change the current frequency, unless it becomes out of bound
> based on the new min/max values. The test happens to work on non-VLV
> platforms because on those the kernel resets the current frequency
> unconditionally (to adjust the RPS interrupt mask as a side-effect) and
> that will lead to an RPS interrupt setting the minimum frequency.
> 
> To fix this load the GPU after decreasing the min frequency and before
> checking the current frequency. This should set the current frequency to
> the minimum.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Isn't this a kernel bug which should be fixed in the kernel? If userspace
changes the requested freq, the kernel should obey right away. Not
somewhen later when something happens ...
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch