From patchwork Thu Jun 4 01:53:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thara Gopinath X-Patchwork-Id: 11586795 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4F18D1391 for ; Thu, 4 Jun 2020 01:53:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 344EA207D0 for ; Thu, 4 Jun 2020 01:53:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="SwblQzt1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727895AbgFDBxV (ORCPT ); Wed, 3 Jun 2020 21:53:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725973AbgFDBxT (ORCPT ); Wed, 3 Jun 2020 21:53:19 -0400 Received: from mail-qt1-x844.google.com (mail-qt1-x844.google.com [IPv6:2607:f8b0:4864:20::844]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B6F0C03E96D for ; Wed, 3 Jun 2020 18:53:19 -0700 (PDT) Received: by mail-qt1-x844.google.com with SMTP id i16so3945486qtr.7 for ; Wed, 03 Jun 2020 18:53:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=M/aBGpswVv6maZErzhj2cA/GWvid14/WP8iAXA5RYds=; b=SwblQzt1kdFZTiYHtpL/Nk56Df7+NKanGfHYdrba6r5nkmLI2W+4j5HEJoqExqwKQA +/+svgVr/wuzXCmJxU453OMsaz5fIgO9/jvlV8ZKpzaPiHy/VPR0l3iazpjoO14TWH1A 6o3LT0+BWDZT992O3QbToU8Yi1jG/koloy93t98E3/Babcre2hUoY4fww4BEMapbYBbc RmHxca4z8bvbm6jV8UQIplrDSxG18wG65ATDlxg0K31fHy2THw+ZlZdphSS4CQVIklzk m4IUARo673EJE+w6BuiQLuDqABDL5f8E4KpDgpZwvtbd8KS4A87qHPav/CQnG6dp2TSX SIeA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=M/aBGpswVv6maZErzhj2cA/GWvid14/WP8iAXA5RYds=; b=qSP6YRzpgocaJgaK6jgb7YdPo6Qj/n7zXTR3mf4scsWv2Oo57JC3Nnch+Vt/usM/CF fQqZdMXKSN9k7xscIAmblzSCzoyBDvVOgOzlZoXmUhDDqgKkgg25UVAUoHWRXP6+EtFi LKWImj0/IQ+XZyDdkuYrKBnLVCsrY5bPgbVAq7NSy9zZDCI/26au4H4OqIgh5vpvh6aD F0VZqx8YsccnU6t9JgtLl8ZCltLiaRSTclNinjcum/scl19wrZ9rcHmM+qr1UDvkVIco iYLpmj/22W4NdRdvdloD4t5Jb6pgfJoF9mnjnfNeJAD7RcDe9TBHyhMpNI0BcwbbgRHi cyyQ== X-Gm-Message-State: AOAM532g+FgEoZ3LCx3RiXFCjSNALCZE5uFLKhQQ6T2JCWMGIGjRA8ro JV7UhT6/a8+rlYiFPLCFpOedOw== X-Google-Smtp-Source: ABdhPJxU4I7156wWSx5mqMyLRAIQwcHPNU2/djok6WgOiwwRGEOWvkEwUL42FKnhamdNogtdPGEMfQ== X-Received: by 2002:ac8:108b:: with SMTP id a11mr2337950qtj.173.1591235598781; Wed, 03 Jun 2020 18:53:18 -0700 (PDT) Received: from pop-os.fios-router.home (pool-71-255-246-27.washdc.fios.verizon.net. [71.255.246.27]) by smtp.googlemail.com with ESMTPSA id t74sm2986439qka.21.2020.06.03.18.53.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2020 18:53:18 -0700 (PDT) From: Thara Gopinath To: rui.zhang@intel.com, ulf.hansson@linaro.org, daniel.lezcano@linaro.org, bjorn.andersson@linaro.org, agross@kernel.org, robh@kernel.org Cc: amit.kucheria@verdurent.com, mark.rutland@arm.com, rjw@rjwysocki.net, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v6 0/6] Introduce Power domain based warming device driver Date: Wed, 3 Jun 2020 21:53:11 -0400 Message-Id: <20200604015317.31389-1-thara.gopinath@linaro.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Certain resources modeled as a generic power domain in linux kernel can be used to warm up the SoC (mx power domain on sdm845) if the temperature falls below certain threshold. These power domains can be considered as thermal warming devices. (opposite of thermal cooling devices). In kernel, these warming devices can be modeled as a thermal cooling device. Since linux kernel today has no instance of a resource modeled as a power domain acting as a thermal warming device, a generic power domain based thermal warming device driver that can be used pan-Socs is the approach taken in this patch series. Since thermal warming devices can be thought of as the mirror opposite of thermal cooling devices, this patch series re-uses thermal cooling device framework. To use these power domains as warming devices require further tweaks in the thermal framework which are out of scope of this patch series. These tweaks have been posted as a separate series[1]. The first patch in this series extends the genpd framework to export out the performance states of a power domain so that when a power domain is modeled as a cooling device, the number of possible states and current state of the cooling device can be retrieved from the genpd framework. The second patch implements the newly added genpd callback for Qualcomm RPMH power domain driver which hosts the mx power domain. The third patch introduces a new cooling device register API that allows a parent to be specified for the cooling device. The fourth patch introduces the generic power domain warming device driver. The fifth patch extends Qualcomm RPMh power controller driver to register mx power domain as a thermal warming device in the kernel. The sixth patch describes the dt binding extensions for mx power domain to be a thermal warming device. The seventh patch introduces the DT entreis for sdm845 to register mx power domain as a thermal warming device. v1->v2: - Rename the patch series from "qcom: Model RPMH power domains as thermal cooling devices" to "Introduce Power domain based thermal warming devices" as it is more appropriate. - Introduce a new patch(patch 3) describing the dt-bindings for generic power domain warming device. - Patch specific changes mentioned in respective patches. v2->v3: - Changed power domain warming device from a virtual device node entry in DT to being a subnode of power domain controller binding following Rob's review comments. - Implemented Ulf's review comments. - The changes above introduced two new patches (patch 3 and 4) v3->v4: - Dropped late_init hook in cooling device ops. Instead introduced a new cooling device register API that allows to define a parent for the cooling device. - Patch specific changes mentioned in respective patches. v4->v5: - Dropped the patch that introduced the cooling device register API with parent as per review comments from Ulf. - Patch specific changes mentioned in respective patches. v5->v6: - Rebased to latest kernel - Few other fixes identified in the review process mentioned in respective patches 1. https://lkml.org/lkml/2019/9/18/1180 Thara Gopinath (6): PM/Domains: Add support for retrieving genpd performance states information soc: qcom: rpmhpd: Introduce function to retrieve power domain performance state count thermal: Add generic power domain warming device driver. soc: qcom: Extend RPMh power controller driver to register warming devices. dt-bindings: power: Extend RPMh power controller binding to describe thermal warming device arm64: dts: qcom: Indicate rpmhpd hosts a power domain that can be used as a warming device. .../devicetree/bindings/power/qcom,rpmpd.yaml | 3 + arch/arm64/boot/dts/qcom/sdm845.dtsi | 1 + drivers/base/power/domain.c | 37 ++++ drivers/soc/qcom/rpmhpd.c | 25 ++- drivers/thermal/Kconfig | 10 ++ drivers/thermal/Makefile | 4 + drivers/thermal/pd_warming.c | 169 ++++++++++++++++++ include/linux/pd_warming.h | 29 +++ include/linux/pm_domain.h | 13 ++ 9 files changed, 290 insertions(+), 1 deletion(-) create mode 100644 drivers/thermal/pd_warming.c create mode 100644 include/linux/pd_warming.h