From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753904AbcBHNla (ORCPT ); Mon, 8 Feb 2016 08:41:30 -0500 Received: from foss.arm.com ([217.140.101.70]:60839 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753388AbcBHNl3 (ORCPT ); Mon, 8 Feb 2016 08:41:29 -0500 Subject: Re: [PATCH v3 4/6] arm64: Enable dynamic CPU capacity initialization To: Mark Brown References: <1454500799-18451-1-git-send-email-juri.lelli@arm.com> <1454500799-18451-5-git-send-email-juri.lelli@arm.com> <56B889F7.306@arm.com> <20160208131320.GA7265@sirena.org.uk> Cc: Juri Lelli , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, peterz@infradead.org, vincent.guittot@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, linux@arm.linux.org.uk, sudeep.holla@arm.com, lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, morten.rasmussen@arm.com From: Dietmar Eggemann Message-ID: <56B89B05.4090207@arm.com> Date: Mon, 8 Feb 2016 13:41:25 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <20160208131320.GA7265@sirena.org.uk> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/02/16 13:13, Mark Brown wrote: > On Mon, Feb 08, 2016 at 12:28:39PM +0000, Dietmar Eggemann wrote: >> On 03/02/16 11:59, Juri Lelli wrote: > >>> +bool arch_wants_init_cpu_capacity(void) >>> +{ >>> + return true; > >> Isn't this a little bit too simple? Not every ARM/ARM64 platform is a >> heterogeneous one. > > Does it matter? Is there any problem with doing the callibration and > having it say that all the CPUs performs very similarly? My > understanding was that this was simply saying it was worth checking to > see if there was some asymmetry. > No, the calibration would work on any platform. I can see your point, you want to have this feature not depend on dt.