Re: [PATCH] drm/i915: boost GPU and CPU freq when leaving idle

[Chris Wilson <chris@chris-wilson.co.uk>]

On Fri, Jun 28, 2013 at 09:54:32AM -0700, Jesse Barnes wrote:
> Coming out of idle is usually due to some sort of user input (swiping a
> screen, clicking a button) and often results in some sort of graphical
> animation.  To prevent stutter for a CPU or GPU intensive animation,
> boost the GPU and CPU freq to the maximum to get the first frame out as
> quickly as possible.  The normal CPU and GPU frequency management code
> will take over from there and (hopefully) clock down to save power as
> needed if the max frequencies aren't required.
> 
> This could probably be done more cleanly, and possibly without another
> uncached read in the execbuf path if we tracked idleness elsewhere.  I'm
> also unsure about the cpufreq calls; I don't really know if this will do
> what I want...

Would seem like a good idea to make intel_mark_busy() dtrt and use them.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre