From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: Re: [Discussion] Performance levels of power domains Date: Wed, 26 Oct 2016 16:46:42 +0530 Message-ID: <20161026111642.GM9162@vireshk-i7> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-pf0-f175.google.com ([209.85.192.175]:36296 "EHLO mail-pf0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933106AbcJZLQq (ORCPT ); Wed, 26 Oct 2016 07:16:46 -0400 Received: by mail-pf0-f175.google.com with SMTP id e6so138214781pfk.3 for ; Wed, 26 Oct 2016 04:16:46 -0700 (PDT) Content-Disposition: inline In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Sudeep Holla Cc: "linux-pm@vger.kernel.org" , Lists linaro-kernel , Stephen Boyd , Michael Turquette , "Rafael J. Wysocki" , Mark Brown , "Nayak, Rajendra" , Georgi Djakov On 26-10-16, 12:09, Sudeep Holla wrote: > Just out of curiosity, what's the protocol used to communicate with this > M3. I will let Qcom guys answer this :) > This is what we already have on Vexpress TC2 and Juno. Currently M3 > provides the information of voltage and frequency for each OPP, but that > may change as it's not always constant. Yeah, I do remember that. But it was always in terms of voltages and so this thing is different here. > That's interesting and this is where it's different and gets complex > than what we have today. Do you have more details on this ? I have written everything that I knew about it :) > I am mainly interested as there are efforts to standardize these > communication with M3 and there's WIP protocol development[1]. It would > be good to see if this user-case is also considered. What do you mean by that ? > And yes I am > interested in the problem you have explained below but just can't my > head around it as I can't fully visualize such systems. :) -- viresh