Hello Chris! The question is: why this change in behavior was made?
On previous platforms Gfx Turbo frequency selection range in driver was in between Rpe & Rp0. Since Rpe is the possible Fmax at Vmin, it was used as the starting frequency once driver booted and any value lower than that was not requested. Thanks! Radek > -----Original Message----- > From: Chris Wilson [mailto:ch...@chris-wilson.co.uk] > Sent: Wednesday, December 30, 2015 10:31 AM > To: Kamble, Sagar A > Cc: S, Deepak; Szwichtenberg, Radoslaw; Intel Graphics Development; Goel, > Akash > Subject: Re: Why idle_freq is set to RPn and not RPe > > 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 > > -- > Chris Wilson, Intel Open Source Technology Centre -------------------------------------------------------------------- Intel Technology Poland sp. z o.o. ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 957-07-52-316 | Kapital zakladowy 200.000 PLN. Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego adresata i moze zawierac informacje poufne. W razie przypadkowego otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej usuniecie; jakiekolwiek przegladanie lub rozpowszechnianie jest zabronione. This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by others is strictly prohibited. _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
