[Intel-gfx] Why idle_freq is set to RPn and not RPe

Chris Wilson chris at chris-wilson.co.uk
Wed Dec 30 01:31:12 PST 2015

On Wed, Dec 30, 2015 at 02:51:27PM +0530, Kamble, Sagar A wrote:
> Hi Chris,
> With below commit, idle frequency is made RPn (HW Min).
> Why are we not keeping it at RPe (Efficient Frequency)?
> My understanding was to set Rpe on idle so that when GPU is out of
> RC6 it can start operating at efficient frequency.

The driver is *idle*. When there is work to be submitted to the GPU,
then we go back to RPe (though we wait for it to wake up first). RPe is
just an inflexion point on the power curve.

Chris Wilson, Intel Open Source Technology Centre

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