From patchwork Fri Sep 11 12:31:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adam Ford X-Patchwork-Id: 11770399 X-Patchwork-Delegate: daniel.lezcano@linaro.org 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 DB2B61580 for ; Fri, 11 Sep 2020 12:33:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B402722208 for ; Fri, 11 Sep 2020 12:33:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MpdvMpPq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725886AbgIKMde (ORCPT ); Fri, 11 Sep 2020 08:33:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34694 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725780AbgIKMcK (ORCPT ); Fri, 11 Sep 2020 08:32:10 -0400 Received: from mail-il1-x144.google.com (mail-il1-x144.google.com [IPv6:2607:f8b0:4864:20::144]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 596B7C061573; Fri, 11 Sep 2020 05:32:10 -0700 (PDT) Received: by mail-il1-x144.google.com with SMTP id a19so4236131ilq.10; Fri, 11 Sep 2020 05:32:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=ugTNUn8mm2Ku6DfVm6vxHRWJ3JTBU9LWayGqG53mxMw=; b=MpdvMpPqMKWBctHOkuDpfxbTZK3NqQSwG0yCiF+ibrvu2DHy4mZCcuQx8xzubGiltk fXkGxi9AehKRLwp0zIARnb4WngxM54WeeCagnuDxR29D12RJa1RwACdiwe9q5YMfIJYN ZcUEatOXvTiO9nfXsyZEkNS2co1OVbLzgigfJdoFzuimQ1Fn9s8sKghAhXBZQAx/OENo ziWEcXeoXQ1OdBgW99Ypps/x+fb6rEHBfc6A6iBRcPKTcTtOrep0VtJ0hv/Kg6weibPT Wds0+wkvGyF/NhDJYTE+ScXFZX1lSo4xa05qmXHg/0sC/uX7kHss/xGwC1pxVFNmeCA2 QpGw== 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=ugTNUn8mm2Ku6DfVm6vxHRWJ3JTBU9LWayGqG53mxMw=; b=aFNay7b0dKNebITLYAjLRyKY1KHJAYMPj18w7DsM965BPgUq2AWhZ1Z6L3mV+CYzrs LWRtE4crh7Pa1vHDMrjrFeK7z1QER0Y67lwofE3CZ9a4RYR80XdMZCteSH54zu5bv5MB Clht3l/DZjiSvZV3gy8e6qWRP5hrFkVBjWNThtr20W45usBLQ1d3iOCgJgOcfdUoUXn9 KuqlPiVwbrPv4bQPua4Avu0IWZUgHvAWq0bkSZfZFVzoyNacBI2zt7G1oFM1BqX8+glg aQcUNcj9pgJBsKR9LcQ2izWQrOtgHl+gvUince3S5/DwN8BBN3ba/iGDLNf6CZUySFfZ 4qxg== X-Gm-Message-State: AOAM5327iensW63wa45mvShIVMVl8MoFC8xNe8oPCdt8HisMLBfP9c7T ryZCRi3ptXt86fx2aNeKofZVeXvhMAQ= X-Google-Smtp-Source: ABdhPJxl2ZwcqutABattNSET4QKwUd7/IzX1WiTFxtg4ligGakYCwNb+FcHWlik94jksPpHtKPkWvw== X-Received: by 2002:a92:9646:: with SMTP id g67mr1536585ilh.116.1599827529114; Fri, 11 Sep 2020 05:32:09 -0700 (PDT) Received: from aford-IdeaCentre-A730.lan (mn-10k-dhcp7-1791.dsl.hickorytech.net. [68.232.239.6]) by smtp.gmail.com with ESMTPSA id m18sm1144277iln.80.2020.09.11.05.32.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Sep 2020 05:32:08 -0700 (PDT) From: Adam Ford To: linux-pm@vger.kernel.org, linux-omap@vger.kernel.org Cc: aford@beaconembedded.com, Adam Ford , kernel test robot , Andreas Kemnade , Tony Lindgren , Russell King , Eduardo Valentin , Keerthy , Zhang Rui , Daniel Lezcano , Amit Kucheria , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] thermal: ti-soc-thermal: Enable addition power management Date: Fri, 11 Sep 2020 07:31:56 -0500 Message-Id: <20200911123157.759379-1-aford173@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The bandgap sensor can be idled when the processor is too, but it isn't currently being done, so the power consumption of OMAP3 boards can elevated if the bangap sensor is enabled. This patch attempts to use some additional power management to idle the clock to the bandgap when not needed. Signed-off-by: Adam Ford Reported-by: kernel test robot Tested-by: Andreas Kemnade # GTA04 --- V3: bandgap_omap_cpu_notifier is only defined when CONFIG_PM_SLEEP is enabled, so make all references to it also depend on CONFIG_PM_SLEEP as well V2: Fix issue where variable stating the suspend mode isn't being properly set and cleared. diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c index ab19ceff6e2a..5e596168ba73 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c @@ -25,10 +25,20 @@ #include #include #include +#include +#include +#include +#include +#include +#include #include "ti-bandgap.h" static int ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id); +#ifdef CONFIG_PM_SLEEP +static int bandgap_omap_cpu_notifier(struct notifier_block *nb, + unsigned long cmd, void *v); +#endif /*** Helper functions to access registers and their bitfields ***/ @@ -1008,6 +1018,11 @@ int ti_bandgap_probe(struct platform_device *pdev) } } +#ifdef CONFIG_PM_SLEEP + bgp->nb.notifier_call = bandgap_omap_cpu_notifier; + cpu_pm_register_notifier(&bgp->nb); +#endif + return 0; remove_last_cooling: @@ -1041,7 +1056,9 @@ int ti_bandgap_remove(struct platform_device *pdev) struct ti_bandgap *bgp = platform_get_drvdata(pdev); int i; - /* First thing is to remove sensor interfaces */ + cpu_pm_unregister_notifier(&bgp->nb); + + /* Remove sensor interfaces */ for (i = 0; i < bgp->conf->sensor_count; i++) { if (bgp->conf->sensors[i].unregister_cooling) bgp->conf->sensors[i].unregister_cooling(bgp, i); @@ -1150,9 +1167,43 @@ static int ti_bandgap_suspend(struct device *dev) if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) clk_disable_unprepare(bgp->fclock); + bgp->is_suspended = true; + return err; } +static int bandgap_omap_cpu_notifier(struct notifier_block *nb, + unsigned long cmd, void *v) +{ + struct ti_bandgap *bgp; + + bgp = container_of(nb, struct ti_bandgap, nb); + + spin_lock(&bgp->lock); + switch (cmd) { + case CPU_CLUSTER_PM_ENTER: + if (bgp->is_suspended) + break; + ti_bandgap_save_ctxt(bgp); + ti_bandgap_power(bgp, false); + if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) + clk_disable(bgp->fclock); + break; + case CPU_CLUSTER_PM_ENTER_FAILED: + case CPU_CLUSTER_PM_EXIT: + if (bgp->is_suspended) + break; + if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) + clk_enable(bgp->fclock); + ti_bandgap_power(bgp, true); + ti_bandgap_restore_ctxt(bgp); + break; + } + spin_unlock(&bgp->lock); + + return NOTIFY_OK; +} + static int ti_bandgap_resume(struct device *dev) { struct ti_bandgap *bgp = dev_get_drvdata(dev); @@ -1161,6 +1212,7 @@ static int ti_bandgap_resume(struct device *dev) clk_prepare_enable(bgp->fclock); ti_bandgap_power(bgp, true); + bgp->is_suspended = false; return ti_bandgap_restore_ctxt(bgp); } diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.h b/drivers/thermal/ti-soc-thermal/ti-bandgap.h index fce4657e9486..ed0ea4b17b25 100644 --- a/drivers/thermal/ti-soc-thermal/ti-bandgap.h +++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.h @@ -12,6 +12,10 @@ #include #include #include +#include +#include +#include +#include struct gpio_desc; @@ -203,6 +207,8 @@ struct ti_bandgap { int irq; struct gpio_desc *tshut_gpiod; u32 clk_rate; + struct notifier_block nb; + unsigned int is_suspended:1; }; /**