From patchwork Thu Jan 28 08:20:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 60689 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp333518lbb; Thu, 28 Jan 2016 00:26:44 -0800 (PST) X-Received: by 10.98.2.216 with SMTP id 207mr2704617pfc.3.1453969603869; Thu, 28 Jan 2016 00:26:43 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h9si15377543pat.144.2016.01.28.00.26.43; Thu, 28 Jan 2016 00:26:43 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-pm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-pm-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-pm-owner@vger.kernel.org; dkim=neutral (body hash did not verify) header.i=@linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965185AbcA1I0e (ORCPT + 11 others); Thu, 28 Jan 2016 03:26:34 -0500 Received: from mail-pf0-f177.google.com ([209.85.192.177]:34770 "EHLO mail-pf0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965162AbcA1IVF (ORCPT ); Thu, 28 Jan 2016 03:21:05 -0500 Received: by mail-pf0-f177.google.com with SMTP id o185so15197012pfb.1 for ; Thu, 28 Jan 2016 00:21:02 -0800 (PST) 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 :in-reply-to:references; bh=bSUBjWG6UueCy0/dYrUGw15/XptOhQqETz+wB8wa0BQ=; b=kvBaMyb6OIil3vhfG/taamoRRHziypMWMKekg4m8NicwRG0o0Fcp44J4R/J0J9KaSY tO9Eif2wnRasQeS7uk8kcSgCFNmdYYeEwdtR9SD2w7iAc2zHtoHqdtPSLFtwSNQSYbH8 zSW9CyLepmQH+8uRtRq7YJLt8WdHj/WW+laIc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=bSUBjWG6UueCy0/dYrUGw15/XptOhQqETz+wB8wa0BQ=; b=cJhrrCE7J/zDVQUAdg1TNawerCA4x7rfC4ZTzdvyrnX62u1ojwXAYORhGw0Ic0XaaJ 0/sOpic3gdwAuoyZY4BPRQ6LsgzbtpJtmxZabEP5Kr2im9Q50mUWBn0sdJE+gVXGu/39 EsFJ9BsVuxRBre9S2lPhRgUizJPR1/LFufkB91xi569lBr31xvzhcGvr72m1x7GYHzsy YxoqM+E5OydXD6isuPgjibdMGvj+lIo3N94x7x5/pmkMJtYBFfkJQomtISvkk6Xu90b4 YuBfB+ebkZoCBVKx/+AOL3hElKyg5Cqijx57y7cLffuKw5aO9Jdb+DRBBY3+3zeORusX gVYw== X-Gm-Message-State: AG10YORXeL5s/CEAx31m9ZiIbbU7phd6CBExf73aH3kCOlMcYidRDLoS3TRYXR0uCB9vOIiq X-Received: by 10.98.43.73 with SMTP id r70mr2716255pfr.4.1453969262447; Thu, 28 Jan 2016 00:21:02 -0800 (PST) Received: from localhost ([122.171.121.234]) by smtp.gmail.com with ESMTPSA id m87sm14207752pfi.47.2016.01.28.00.21.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Jan 2016 00:21:01 -0800 (PST) From: Viresh Kumar To: Rafael Wysocki Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, Stephen Boyd , nm@ti.com, Viresh Kumar , Greg Kroah-Hartman , Len Brown , linux-kernel@vger.kernel.org (open list), Pavel Machek , Viresh Kumar Subject: [PATCH V2 03/16] PM / OPP: Introduce dev_pm_opp_get_max_volt_latency() Date: Thu, 28 Jan 2016 13:50:32 +0530 Message-Id: <81d90b48867dbdbb6e5e9a911de3873bc5ec4d14.1453965717.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.7.0.79.gdc08a19 In-Reply-To: References: In-Reply-To: References: Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org In few use cases (like: cpufreq), it is desired to get the maximum voltage latency for changing OPPs. Add support for that. Signed-off-by: Viresh Kumar --- drivers/base/power/opp/core.c | 59 +++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 6 +++++ 2 files changed, 65 insertions(+) -- 2.7.0.79.gdc08a19 -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 71545becfca1..ffe2406af882 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -231,6 +231,65 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); /** + * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds + * @dev: device for which we do this operation + * + * Return: This function returns the max voltage latency in nanoseconds. + * + * Locking: This function takes rcu_read_lock(). + */ +unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) +{ + struct device_opp *dev_opp; + struct dev_pm_opp *opp; + struct regulator *reg; + unsigned long latency_ns = 0; + unsigned long min_uV = ~0, max_uV = 0; + int ret; + + rcu_read_lock(); + + dev_opp = _find_device_opp(dev); + if (IS_ERR(dev_opp)) { + rcu_read_unlock(); + return 0; + } + + reg = dev_opp->regulator; + if (IS_ERR_OR_NULL(reg)) { + /* Regulator may not be required for device */ + if (reg) + dev_err(dev, "%s: Invalid regulator (%ld)\n", __func__, + PTR_ERR(reg)); + rcu_read_unlock(); + return 0; + } + + list_for_each_entry_rcu(opp, &dev_opp->opp_list, node) { + if (!opp->available) + continue; + + if (opp->u_volt_min < min_uV) + min_uV = opp->u_volt_min; + if (opp->u_volt_max > max_uV) + max_uV = opp->u_volt_max; + } + + rcu_read_unlock(); + + /* + * The caller needs to ensure that dev_opp (and hence the regulator) + * isn't freed, while we are executing this routine. + */ + ret = regulator_set_voltage_time(reg, min_uV, max_uV); + if (ret > 0) + latency_ns = ret * 1000; + + return latency_ns; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); + +/** * dev_pm_opp_get_suspend_opp() - Get suspend opp * @dev: device for which we do this operation * diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index c70a18ac9c8a..5daa43058ac1 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -34,6 +34,7 @@ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp); int dev_pm_opp_get_opp_count(struct device *dev); unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev); +unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev); struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev); struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, @@ -88,6 +89,11 @@ static inline unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) return 0; } +static inline unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) +{ + return 0; +} + static inline struct dev_pm_opp *dev_pm_opp_get_suspend_opp(struct device *dev) { return NULL;