From patchwork Wed Nov 26 05:52:58 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Viresh Kumar X-Patchwork-Id: 5384161 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DBEF5C11AC for ; Wed, 26 Nov 2014 05:53:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 11CA6201F4 for ; Wed, 26 Nov 2014 05:53:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3194D20160 for ; Wed, 26 Nov 2014 05:53:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752218AbaKZFxa (ORCPT ); Wed, 26 Nov 2014 00:53:30 -0500 Received: from mail-pd0-f171.google.com ([209.85.192.171]:37949 "EHLO mail-pd0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752211AbaKZFxa (ORCPT ); Wed, 26 Nov 2014 00:53:30 -0500 Received: by mail-pd0-f171.google.com with SMTP id y13so2111487pdi.16 for ; Tue, 25 Nov 2014 21:53:29 -0800 (PST) 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=Wr7vrA/QLSTc4F6nzMUrYp1gcrM4tcy53H9y6K7DXhY=; b=L0Cuio3Julf+QuiSIoXiWza3FsacLBt9fezWdNFUc43CAicm+iswfX94V+Zwi2ov5k uqo+a1uPN/HAU02N5iFtnTP07l4fpdOyBPOCvKqDFXeZ1Dv3O3efzt94LYEG/kpW4C1E sCqjZ8Nx6zfQciAVmlqXzt7K+4MXJl514mnclV/jHdXFXHWU5Y4T9lohqH5p5n27GVjB AAl1dvNaGnlYMEwKdcpHIX1HKT/HED/NC+RML2MM6/hqDm5gYPLDrEFZkqA6nXdKUVJ7 AwNozI19ZjDgE9NoaGPieQanO44VJVQwu1l75TA9GjP9Fldob5ukDHESxDblu+/gfIyO /+PA== X-Gm-Message-State: ALoCoQl0iby7Mti32mTn0NyHoxKmol6/NxS5jxlfJTp5lQQsNP/cYCmVPzsNsK2l1dx2pkGiFQrs X-Received: by 10.70.43.68 with SMTP id u4mr51073579pdl.6.1416981209762; Tue, 25 Nov 2014 21:53:29 -0800 (PST) Received: from localhost ([122.167.111.40]) by mx.google.com with ESMTPSA id ir2sm3101804pbc.57.2014.11.25.21.53.28 for (version=TLSv1.2 cipher=RC4-SHA bits=128/128); Tue, 25 Nov 2014 21:53:29 -0800 (PST) From: Viresh Kumar To: Rafael Wysocki , edubezval@gmail.com Cc: linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org, l.majewski@samsung.com, Viresh Kumar Subject: [PATCH 3/7] cpufreq: Introduce ->usable() callback for cpufreq drivers Date: Wed, 26 Nov 2014 11:22:58 +0530 Message-Id: <95b84bb8af3d4d9667a79db520cfa37d9444d75b.1416980448.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 2.0.3.693.g996b0fd 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 X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently there is no callback for cpufreq drivers which is called once the policy is ready to be used. There are some requirements where such a callback is required. One of them is registering a cooling device with the help of of_cpufreq_cooling_register(). This routine tries to get 'struct cpufreq_policy' for CPUs which isn't yet initialed at the time ->init() is called and so we face issues while registering the cooling device. Because we can't register cooling device from ->init(), we need a callback that is called after the policy is ready to be used and hence we introduce ->usable() callback. Signed-off-by: Viresh Kumar Reviewed-by: Eduardo Valentin Tested-by: Eduardo Valentin --- drivers/cpufreq/cpufreq.c | 5 +++++ include/linux/cpufreq.h | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index de2c3e1..4fb95b9 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -1285,8 +1285,13 @@ static int __cpufreq_add_dev(struct device *dev, struct subsys_interface *sif) up_write(&policy->rwsem); kobject_uevent(&policy->kobj, KOBJ_ADD); + up_read(&cpufreq_rwsem); + /* Callback for handling stuff after policy is ready */ + if (cpufreq_driver->usable) + cpufreq_driver->usable(policy); + pr_debug("initialization complete\n"); return 0; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index db3c130..4795c0b 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -267,6 +267,10 @@ struct cpufreq_driver { void (*stop_cpu)(struct cpufreq_policy *policy); int (*suspend)(struct cpufreq_policy *policy); int (*resume)(struct cpufreq_policy *policy); + + /* Will be called after the driver is fully initialized */ + void (*usable)(struct cpufreq_policy *policy); + struct freq_attr **attr; /* platform specific boost support code */