[Intel-gfx] [PATCH 3/5] drm/i915/chv: Set min freq to efficient

[Hindman, Gavin]

>On Thu, Feb 26, 2015 at 08:46:56PM +0530, deepak.s at linux.intel.com<http://lists.freedesktop.org/mailman/listinfo/intel-gfx> wrote:

>> From: Deepak S <deepak.s at linux.intel.com<http://lists.freedesktop.org/mailman/listinfo/intel-gfx>>

>>

>> 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

Power team is reporting ~140mW delta at idle using efficient freq  - definitely significant.


-          Gavin

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