From patchwork Thu May 5 01:58:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 12838981 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB950C43217 for ; Thu, 5 May 2022 01:58:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236600AbiEECBy (ORCPT ); Wed, 4 May 2022 22:01:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236547AbiEECBy (ORCPT ); Wed, 4 May 2022 22:01:54 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 289FE4C787; Wed, 4 May 2022 18:58:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1651715896; x=1683251896; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=FPStXkvr3rZk2D9ys9NDAfJduNmQmCY//XhY19dRqT0=; b=kEpWLvXPitb5JAg2LPrmo7qOkDOIFthUj7tGlOOramfLbftEvAjw9awz KsWoJ4eR0qS/2kw3IPgmvjuVelIuJ8XIKLFNHDjseZE708v5ep2wuC7y/ AoMrtGJPp61KWntQf1ri3sPI8Me8vIqdWbGoYcLX2fqXbOLupmDZxTYsN Jq/+jv0ZlBBcPkB4YCUZojGWFYxToNSYnqUUdlLKJM4jItTZwq+i0Yr/S v/l9+FIxoQ5/5tvF0DfK2bfLrr/oVmU/yVCj3sVG5Lvbl79LOs+XaEXTK 3bMZvmAkwIwx3yd2UvR9F58ShcDNWELfJ+VazwtNLKB018d2euO0GmTii g==; X-IronPort-AV: E=McAfee;i="6400,9594,10337"; a="293153400" X-IronPort-AV: E=Sophos;i="5.91,199,1647327600"; d="scan'208";a="293153400" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 May 2022 18:58:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,199,1647327600"; d="scan'208";a="537105971" Received: from rzhang1-dev.sh.intel.com ([10.239.48.43]) by orsmga006.jf.intel.com with ESMTP; 04 May 2022 18:58:12 -0700 From: Zhang Rui To: rjw@rjwysocki.net, kvalo@kernel.org, alexandre.belloni@bootlin.com Cc: linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, linux-rtc@vger.kernel.org, linux-wireless@vger.kernel.org, daniel.lezcano@linaro.org, merez@codeaurora.org, mat.jonczyk@o2.pl, sumeet.r.pawnikar@intel.com, len.brown@intel.com Subject: [PATCH 0/7] PM: Solution for S0ix failure caused by PCH overheating Date: Thu, 5 May 2022 09:58:07 +0800 Message-Id: <20220505015814.3727692-1-rui.zhang@intel.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On some Intel client platforms like SKL/KBL/CNL/CML, there is a PCH thermal sensor that monitors the PCH temperature and blocks the system from entering S0ix in case it overheats. Commit ef63b043ac86 ("thermal: intel: pch: fix S0ix failure due to PCH temperature above threshold") introduces a delay loop to cool the temperature down for this purpose. However, in practice, we found that the time it takes to cool the PCH down below threshold highly depends on the initial PCH temperature when the delay starts, as well as the ambient temperature. For example, on a Dell XPS 9360 laptop, the problem can be triggered 1. when it is suspended with heavy workload running. or 2. when it is moved from New Hampshire to Florida. In these cases, the 1 second delay is not sufficient. As a result, the system stays in a shallower power state like PCx instead of S0ix, and drains the battery power, without user' notice. In this patch series, we first fix the problem in patch 1/7 ~ 3/7, by 1. expand the default overall cooling delay timeout to 60 seconds. 2. make sure the temperature is below threshold rather than equal to it. 3. move the delay to .suspend_noirq phase instead, in order to a) do the cooling when the system is in a more quiescent state b) be aware of wakeup events during the long delay, because some wakeup events (ACPI Power button Press, USB mouse, etc) become valid only in .suspend_noirq phase and later. However, this potential long delay introduces a problem to our suspend stress automation test, because the delay makes it hard to predict how much time it takes to suspend the system. As we want to do as much suspend iterations as possible in limited time, setting a 60+ seconds rtc alarm for suspend which usually takes shorter than 1 second is far beyond overkill. Thus, in patch 4/7 ~ 7/7, a rtc driver hook is introduced, which cancels the armed rtc alarm in the beginning of suspend and then rearm the rtc alarm with a short interval (say, 2 second) right before system suspended. By running # echo 2 > /sys/module/rtc_cmos/parameters/rtc_wake_override_sec before suspend, the system can be resumed by RTC alarm right after it is suspended, no matter how much time the suspend really takes. This patch series has been tested on the same Dell XPS 9360 laptop and S0ix is 100% achieved across 1000+ s2idle iterations. thanks, rui