Re: [PATCH 3/5] drm/i915/chv: Set min freq to efficient frequency on chv

Chris Wilson
2015-02-26T16:12:32Z

On Thu, Feb 26, 2015 at 08:46:56PM +0530, deepak.s@linux.intel.com wrote:
> From: Deepak S <deepak.s@linux.intel.com>
>
> After feedback from the hardware team, now we set the GPU min freq to RPe.
> If we drop the freq to RPn, we found that the punit was not setting the
> voltage to Vnn, So recommendation is to set min freq to RPe.

And does it change the voltage at all? Is there really any advantage to
the extra code on idle? Does efficient_freq really consume less power
than min_freq when active (assuming a min_freq/efficient_freq busy
workload i.e. does a workload that would be 100% busy at min_freq
consume less power when run at efficient_freq)?
-Chris

--
Chris Wilson, Intel Open Source Technology Centre