From patchwork Thu Jun 27 13:34:21 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 11019725 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8981F13B4 for ; Thu, 27 Jun 2019 13:34:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7A60326C9B for ; Thu, 27 Jun 2019 13:34:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 77EDE28B3D; Thu, 27 Jun 2019 13:34:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C6463288C4 for ; Thu, 27 Jun 2019 13:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726841AbfF0Nen (ORCPT ); Thu, 27 Jun 2019 09:34:43 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:37228 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726370AbfF0Nen (ORCPT ); Thu, 27 Jun 2019 09:34:43 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 5415C607CA; Thu, 27 Jun 2019 13:34:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1561642482; bh=sNGHRg/AVqvcuTMuiO6jtsnX89/WYPc7sjQ6Yr/5IKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZUuCCPGw9JYEnIf5r5uZ6Ml24cepvZKH7TEkucJs1K18mzh+U/8A6s+2duGLLWMri k1HearZJT1LRD9CXYp3eU1VZqo1xRmZ6PVbQWS9AvyFUh0DPF0Pj59VZyjw8C3duCT RsaWZo0gmP7J5UFZcBRBoTAJgSCzP1lxJ8Lut2Rk= Received: from blr-ubuntu-87.qualcomm.com (blr-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.18.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sibis@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7FE5660A33; Thu, 27 Jun 2019 13:34:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1561642481; bh=sNGHRg/AVqvcuTMuiO6jtsnX89/WYPc7sjQ6Yr/5IKE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eYD501kMzkX4BCy96Ew+uubjgWIYzLGl5EemTcDgTLvPhhWWmScA0/Rqvkw37gRtv WdsP1jPSr78oHs2AnlWC+Wm2eXkD0MpD022/iCIdfdZTkWfjC0B1UJ9sDlnEKkcY3t zzlGe43dO43hxM57Ete04ly9v8xcPODoUYKGHzVg= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7FE5660A33 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sibis@codeaurora.org From: Sibi Sankar To: viresh.kumar@linaro.org, nm@ti.com, sboyd@kernel.org, georgi.djakov@linaro.org Cc: agross@kernel.org, david.brown@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, rjw@rjwysocki.net, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, saravanak@google.com, Sibi Sankar Subject: [PATCH RFC 1/4] OPP: Add and export helper to update voltage Date: Thu, 27 Jun 2019 19:04:21 +0530 Message-Id: <20190627133424.4980-2-sibis@codeaurora.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190627133424.4980-1-sibis@codeaurora.org> References: <20190627133424.4980-1-sibis@codeaurora.org> 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 X-Virus-Scanned: ClamAV using ClamSMTP Add and export 'dev_pm_opp_update_voltage' to find and update voltage of an opp for a given frequency. This will be useful to update the opps with voltages read back from firmware. Signed-off-by: Sibi Sankar --- drivers/opp/core.c | 52 ++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 10 ++++++++ 2 files changed, 62 insertions(+) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 68551d6366e6b..c85c04dc2c7de 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2197,6 +2197,58 @@ int dev_pm_opp_disable(struct device *dev, unsigned long freq) } EXPORT_SYMBOL_GPL(dev_pm_opp_disable); +/** + * dev_pm_opp_update_voltage() - Find and update voltage + * @dev: device for which we do this operation + * @freq: OPP frequency to update voltage + * @u_volt: voltage requested for this opp + * + * Find and update voltage of a disabled opp corresponding to the given + * frequency. This is useful only for devices with single power supply. + * + * Return: 0 if no modification was done OR modification was + * successful or a negative error value. + */ +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt) +{ + struct dev_pm_opp *opp = ERR_PTR(-ENODEV); + struct opp_table *opp_table; + unsigned long tol; + int ret = 0; + + opp = dev_pm_opp_find_freq_exact(dev, freq, false); + if (IS_ERR(opp)) + return PTR_ERR(opp); + + /* Find the opp_table */ + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) { + ret = PTR_ERR(opp_table); + dev_err(dev, "%s: OPP table not found (%d)\n", __func__, ret); + goto put_opp; + } + + mutex_lock(&opp_table->lock); + + /* update only if the opp is disabled */ + if (opp->available) + goto unlock; + + tol = u_volt * opp_table->voltage_tolerance_v1 / 100; + opp->supplies[0].u_volt_min = u_volt - tol; + opp->supplies[0].u_volt = u_volt; + opp->supplies[0].u_volt_min = u_volt + tol; + +unlock: + mutex_unlock(&opp_table->lock); + dev_pm_opp_put_opp_table(opp_table); +put_opp: + dev_pm_opp_put(opp); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_update_voltage); + /** * dev_pm_opp_register_notifier() - Register OPP notifier for the device * @dev: Device for which notifier needs to be registered diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 87fa09d93d8c2..a17c462974851 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -130,6 +130,9 @@ int dev_pm_opp_enable(struct device *dev, unsigned long freq); int dev_pm_opp_disable(struct device *dev, unsigned long freq); +int dev_pm_opp_update_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt); + int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb); int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb); @@ -261,6 +264,13 @@ static inline int dev_pm_opp_disable(struct device *dev, unsigned long freq) return 0; } +static inline int dev_pm_opp_update_voltage(struct device *dev, + unsigned long freq, + unsigned long u_volt) +{ + return 0; +} + static inline int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) { return -ENOTSUPP;