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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 E1B42C3A59E for ; Sat, 24 Aug 2019 05:58:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AAB152133F for ; Sat, 24 Aug 2019 05:58:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="qkF+5Fb1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725782AbfHXF6M (ORCPT ); Sat, 24 Aug 2019 01:58:12 -0400 Received: from mail-pl1-f172.google.com ([209.85.214.172]:38275 "EHLO mail-pl1-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725777AbfHXF6M (ORCPT ); Sat, 24 Aug 2019 01:58:12 -0400 Received: by mail-pl1-f172.google.com with SMTP id w11so6405102plp.5 for ; Fri, 23 Aug 2019 22:58:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=9XRmX24je7yglBYNnKykqbyW6HW63V9ReMAxFYEEt1s=; b=qkF+5Fb1zSoQCB4yA3iJFPvYFkOn+QAGCxX1cDIS47hpoTsNIylKqNs6zKfF0r0iqS Szq6IQtSIS5Pe7Pd3S4OqOJoFEZhEFEN/YB0sFk+f+WEdOm45fWTREN1MXMGJKRlGnn+ gdI7fqv9JswyhDpABaQX7fvDvDRFG7MPBjihoPEMuudwGT4dl4oJjfY/6s7znvE38oZM nP2P9ROqQ8FhO9cW1Qv1YHcYOaaGUJ+8+vqRlm/aBa6nSFZNmn6zxXWgWzmcXiuBnKd9 AVWfItHhsDHiaD0Gc5YIMG1REV74ppZf7c4SiiUcC/BIlrGSzz60S7TpSSI+ATYwwXH1 YAdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=9XRmX24je7yglBYNnKykqbyW6HW63V9ReMAxFYEEt1s=; b=Z7LwLJZn8CuXtzw9+M7PpqO3LUL4KHH1Yo65jYG/tNI2M6stlVzQM+pcL/pwIxNuuR j5dcmjdkbyHBjTDA8ZKtZGogvFfBo/pJlwLnUO/N3yNMFtUbmZ3750Dxad38681Smqwd AWuNYYdbA9zjboP4mYyxwBbF9aHVZL+iXhf3KInu+1qdlXUWoAHj22WFse5OoEeMPA/8 r3Jrr7Szv9raJ1pMV/nb4ah1tumZWh8h3g4fLcP9UY/X77p4qQgcGbwnuU7kwR+NeBqL l0Tf6VV853axCuY7ErjjpbnkjMsXLsIIXpWHpqe8Dnk8uWZo9niwjy+adTyyuCbiFbDk ZxJg== X-Gm-Message-State: APjAAAUm5r//KhGzSI7yBiiaPO2BLDmzrqAsAuqzGaw9l0yf76pCdc34 95gDaMUkuJYtESz0eUPagP724g== X-Google-Smtp-Source: APXvYqx/S116wBZhFEBYMvZPw0PX30vsJXa9tlWx1ji4IPTccDJ/vnV/LOzMfXLdMIT08JMykBbf9A== X-Received: by 2002:a17:902:302:: with SMTP id 2mr8654563pld.149.1566626291651; Fri, 23 Aug 2019 22:58:11 -0700 (PDT) Received: from tuxbook-pro (104-188-17-28.lightspeed.sndgca.sbcglobal.net. [104.188.17.28]) by smtp.gmail.com with ESMTPSA id d18sm3580521pgi.40.2019.08.23.22.58.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Aug 2019 22:58:10 -0700 (PDT) Date: Fri, 23 Aug 2019 23:00:02 -0700 From: Bjorn Andersson To: Daniel Lezcano Cc: Thara Gopinath , qualcomm-lt@lists.linaro.org, linux-pm@vger.kernel.org, ulf.hansson@linaro.org, rnayak@codeaurora.org Subject: Re: [PATCH 0/4] qcom: Model RPMH power domains as thermal cooling devices Message-ID: <20190824060002.GS26807@tuxbook-pro> References: <1565398727-23090-1-git-send-email-thara.gopinath@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org On Wed 14 Aug 03:52 PDT 2019, Daniel Lezcano wrote: > > Hi Thara, > > interesting series. Can you describe what use case this series will solve? > The purpose is to ensure a minimum voltage (voltage corner) on the memory rail (mx) at low temperature, to meet some physical requirement. > On 10/08/2019 02:58, Thara Gopinath wrote: > > Certain RPMH power domains can be used to warm up the SoC (mx on sdm845) > > if the temperature falls below certain threshold. > > What is the relationship between the temperature fall, the sensor(s) > location and the warming device(s) in this case? > Presumably any on-die sensor could be used and the minimum voltage requirement only applies below some configurable threshold. > > > These power domains > > can be considered as thermal warming devices > > (opposite of thermal cooling devices). > > Is it possible to elaborate how works the RPMH as a warming device and > what is the "mx on sdm845"? > RPMh is the interface used to configure the voltage corner (and other shared resources, such as regulators, interconnects etc). mx is the "memory rail" power domain. Regards, Bjorn