From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40916C43603 for ; Thu, 12 Dec 2019 08:17:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 135B9205C9 for ; Thu, 12 Dec 2019 08:17:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728160AbfLLIR3 (ORCPT ); Thu, 12 Dec 2019 03:17:29 -0500 Received: from comms.puri.sm ([159.203.221.185]:48236 "EHLO comms.puri.sm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726382AbfLLIR3 (ORCPT ); Thu, 12 Dec 2019 03:17:29 -0500 Received: from localhost (localhost [127.0.0.1]) by comms.puri.sm (Postfix) with ESMTP id 59FAFE01F3; Thu, 12 Dec 2019 00:17:28 -0800 (PST) Received: from comms.puri.sm ([127.0.0.1]) by localhost (comms.puri.sm [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r6kXsETnmb9G; Thu, 12 Dec 2019 00:17:27 -0800 (PST) Subject: Re: [PATCH V5 2/3] thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver To: Daniel Lezcano , rui.zhang@intel.com Cc: rjw@rjwysocki.net, linux-pm@vger.kernel.org, viresh.kumar@linaro.org, amit.kucheria@linaro.org, linux-kernel@vger.kernel.org References: <20191211224347.1001-1-daniel.lezcano@linaro.org> <20191211224347.1001-2-daniel.lezcano@linaro.org> From: Martin Kepplinger Autocrypt: addr=martin.kepplinger@puri.sm; keydata= mQINBFULfZABEADRxJqDOYAHfrp1w8Egcv88qoru37k1x0Ugy8S6qYtKLAAt7boZW+q5gPv3 Sj2KjfkWA7gotXpASN21OIfE/puKGwhDLAySY1DGNMQ0gIVakUO0ji5GJPjeB9JlmN5hbA87 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Af4wUksA+TEUl2XPu84pjLMUbm0FA+sUnGvMkhCn8YdQtEbcgNYq4eIlOjHW+h7zU2G5/pm+ FmxNAJx7iiXaUY9KQ3snoEz3r37RxEDcvTY9KKahwxEzk2Mf58OPVaV4PEsRianrmErSUfmp l93agbtZK1r5LaxeItFOj+O2hWFLNDenJRlBYwXwlJCiHxM/O273hZZPoP8L5p54uXhaS5EJ uV2Xzgbi3VEbw3GZr+EnDC7XNE2wUrnlD/w2W6RzVYjVT6IX4SamNlV+MWX0/1fYCutfqZl8 6BSKmJjlWpfkPKzyzjhGQVZrTZYnKAu471hRv8/6Dx5JuZJgDCnYanNx3DDreRMu/nq6TfaO ekMtxgNYb/8oDry09UFHbGHLsWn6oBo= Message-ID: <5075876b-17d2-61ba-c383-38a6ddae076f@puri.sm> Date: Thu, 12 Dec 2019 09:17:24 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 In-Reply-To: <20191211224347.1001-2-daniel.lezcano@linaro.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On 11.12.19 23:43, Daniel Lezcano wrote: > The cpu idle cooling device offers a new method to cool down a CPU by > injecting idle cycles at runtime. > > It has some similarities with the intel power clamp driver but it is > actually designed to be more generic and relying on the idle injection > powercap framework. > > The idle injection duration is fixed while the running duration is > variable. That allows to have control on the device reactivity for the > user experience. > > An idle state powering down the CPU or the cluster will allow to drop > the static leakage, thus restoring the heat capacity of the SoC. It > can be set with a trip point between the hot and the critical points, > giving the opportunity to prevent a hard reset of the system when the > cpufreq cooling fails to cool down the CPU. > > With more sophisticated boards having a per core sensor, the idle > cooling device allows to cool down a single core without throttling > the compute capacity of several cpus belonging to the same clock line, > so it could be used in collaboration with the cpufreq cooling device. > > Signed-off-by: Daniel Lezcano > Acked-by: Viresh Kumar Tested-by: Martin Kepplinger thanks