From patchwork Fri Jul 9 01:30:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 471954 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=-19.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 E6593C07E96 for ; Fri, 9 Jul 2021 01:32:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB09E6146B for ; Fri, 9 Jul 2021 01:32:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230187AbhGIBes (ORCPT ); Thu, 8 Jul 2021 21:34:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230352AbhGIBde (ORCPT ); Thu, 8 Jul 2021 21:33:34 -0400 Received: from mail-lf1-x12f.google.com (mail-lf1-x12f.google.com [IPv6:2a00:1450:4864:20::12f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99D73C061760 for ; Thu, 8 Jul 2021 18:30:51 -0700 (PDT) Received: by mail-lf1-x12f.google.com with SMTP id 8so8238227lfp.9 for ; Thu, 08 Jul 2021 18:30:51 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=ViWAwMziOjMwHhwls8FGGD+OSf0htK/WswqBD2gjBM4=; b=DbTxSS1jLF83CsCHOvMsMre+MPG0QQCLcdDPMJxLGEsa7fhokx3Awpk8KWm3mEiC/d yDGbbBKMvX5h2fM7h93fjZmxwgg6In3iZnRLdXIcTpa8wGHec6UF7IL31D5ZySMUuxUX /IjNk0kZW6taAw2ZqXIIFwM5PniYFlasJjyqv7GpZ0tXrrVbT50Vv63TskTUIniSf1ui glYlS7W8XBssjAjhhDbDximXDo+y6Un2LqZXRbXJhhRcJOjx2jqg1ETvEy9kWM8Vorqu /GmMv/rgJAQCDere/Pw0Z6rjFhISpoHOgZM30w3yWxwBW5l7SfzcEfOgs+jvbefGnxr/ wfnQ== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=ViWAwMziOjMwHhwls8FGGD+OSf0htK/WswqBD2gjBM4=; b=db+W3BerAJi/s2uJsAifQ4JMJBOaf1Q8ZQvsmQ3I4hmVH9ALtq0DAxyVr0/ciT5Chh pyuTl8A00bGwQSwdnLkFhNhZFy2Qy+hTZ9g6+dhwwPzXnAZMA6/5a+/hK33xc70mhH9V kwKaa3DxobWZBZ1ilUmMqk91UmfeIxvCL17NX2jsTi+IpHuGSwJ16CUT0yj0wcTDynz6 SDpJNNKgEgthj7AWe6SiTezQdO1ZkLtQBArlhRugAdkz3q1qMe06X9/T4abuwgZ9Lqsg KFx1seteF+36tU6IQ1+yhcW+p1caYXpnYkI4CgVujaB7wlVL/7frbEe4PlNFSPxFjPNO bCyA== X-Gm-Message-State: AOAM533uANaM/O4AP+8h4baI7ujJWP+hf9lI3eAq821UCTrlJ8DwvRIi r/YT8KkAc2iddCyayOBM0ydmsg== X-Google-Smtp-Source: ABdhPJxXnwaid02H2Q5orrJpxSZjmVtX+riiVW0cuKAi7LO6/R3lc+qzBqiTrS6iqtzAv4C69hTerA== X-Received: by 2002:a05:6512:50e:: with SMTP id o14mr25137340lfb.286.1625794249897; Thu, 08 Jul 2021 18:30:49 -0700 (PDT) Received: from eriador.lan ([37.153.55.125]) by smtp.gmail.com with ESMTPSA id u16sm405637ljj.113.2021.07.08.18.30.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jul 2021 18:30:49 -0700 (PDT) From: Dmitry Baryshkov To: Andy Gross , Bjorn Andersson , Rob Herring , Stephen Boyd , Taniya Das , Jonathan Marek , Michael Turquette Cc: linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, Bryan O'Donoghue , Mark Brown , Ulf Hansson , linux-kernel@vger.kernel.org Subject: [PATCH v2 3/7] PM: domains: Add support for runtime PM Date: Fri, 9 Jul 2021 04:30:39 +0300 Message-Id: <20210709013043.495233-4-dmitry.baryshkov@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210709013043.495233-1-dmitry.baryshkov@linaro.org> References: <20210709013043.495233-1-dmitry.baryshkov@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Registers for some genpds can be located in the SoC area, powered up by another power domain. To enabled access to those registers, respective domain should be turned on. This patch adds basic infrastructure to the genpd code to allow implementing drivers for such genpd. PM domain can provide the parent device through the genpd->dev.parent pointer. If its provided at the pm_genpd_init() call time and if it is pm-enabled, genpd power_on and power_off operations will call pm_runtime_get_sync() before powering up the domain and pm_runtime_put_sync() after powering it down. Signed-off-by: Dmitry Baryshkov --- drivers/base/power/domain.c | 33 +++++++++++++++++++++++++++++++++ include/linux/pm_domain.h | 6 ++++++ 2 files changed, 39 insertions(+) diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c index e5d97174c254..14e75a62254d 100644 --- a/drivers/base/power/domain.c +++ b/drivers/base/power/domain.c @@ -482,6 +482,30 @@ void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) } EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); +static int _genpd_pm_runtime_get(struct generic_pm_domain *genpd) +{ + int ret; + + if (!(genpd->flags & _GENPD_FLAG_RPM_ENABLED)) + return 0; + + ret = pm_runtime_get_sync(genpd->dev.parent); + if (ret < 0) { + pm_runtime_put_noidle(genpd->dev.parent); + return ret; + } + + return 0; +} + +static void _genpd_pm_runtime_put(struct generic_pm_domain *genpd) +{ + if (!(genpd->flags & _GENPD_FLAG_RPM_ENABLED)) + return; + + pm_runtime_put_sync(genpd->dev.parent); +} + static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) { unsigned int state_idx = genpd->state_idx; @@ -497,6 +521,10 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) if (ret) return ret; + ret = _genpd_pm_runtime_get(genpd); + if (ret) + return ret; + if (!genpd->power_on) goto out; @@ -526,6 +554,7 @@ static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); return 0; err: + _genpd_pm_runtime_put(genpd); raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, NULL); return ret; @@ -572,6 +601,7 @@ static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) genpd->name, "off", elapsed_ns); out: + _genpd_pm_runtime_put(genpd); raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, NULL); return 0; @@ -1986,6 +2016,9 @@ int pm_genpd_init(struct generic_pm_domain *genpd, genpd->domain.ops.complete = genpd_complete; genpd->domain.start = genpd_dev_pm_start; + if (genpd->dev.parent && pm_runtime_enabled(genpd->dev.parent)) + genpd->flags |= GENPD_FLAG_RPM_ENABLED; + if (genpd->flags & GENPD_FLAG_PM_CLK) { genpd->dev_ops.stop = pm_clk_suspend; genpd->dev_ops.start = pm_clk_resume; diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h index 21a0577305ef..e86cd7cfc9ec 100644 --- a/include/linux/pm_domain.h +++ b/include/linux/pm_domain.h @@ -60,6 +60,10 @@ * GENPD_FLAG_MIN_RESIDENCY: Enable the genpd governor to consider its * components' next wakeup when determining the * optimal idle state. + * + * _GENPD_FLAG_RPM_ENABLED: Use genpd's parent dev for runtime power + * management. There is no need to set this flag, + * it will be detected automatically. */ #define GENPD_FLAG_PM_CLK (1U << 0) #define GENPD_FLAG_IRQ_SAFE (1U << 1) @@ -69,6 +73,8 @@ #define GENPD_FLAG_RPM_ALWAYS_ON (1U << 5) #define GENPD_FLAG_MIN_RESIDENCY (1U << 6) +#define _GENPD_FLAG_RPM_ENABLED (1U << 31) + enum gpd_status { GENPD_STATE_ON = 0, /* PM domain is on */ GENPD_STATE_OFF, /* PM domain is off */