From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934510Ab3FSIz2 (ORCPT ); Wed, 19 Jun 2013 04:55:28 -0400 Received: from mail-pb0-f48.google.com ([209.85.160.48]:58922 "EHLO mail-pb0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934459Ab3FSIzW (ORCPT ); Wed, 19 Jun 2013 04:55:22 -0400 From: Viresh Kumar To: rjw@sisk.pl Cc: linaro-kernel@lists.linaro.org, patches@linaro.org, cpufreq@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, robin.randhawa@arm.com, Steve.Bannister@arm.com, Liviu.Dudau@arm.com, charles.garcia-tobin@arm.com, arvind.chauhan@arm.com, dave.martin@arm.com, Viresh Kumar , Santosh Shilimkar Subject: [PATCH 08/13] cpufreq: omap: call CPUFREQ_POSTCHANGE notfier in error cases Date: Wed, 19 Jun 2013 14:23:02 +0530 Message-Id: <957838f1065ccc20b0252e0a6d37b61f6b173970.1371630975.git.viresh.kumar@linaro.org> X-Mailer: git-send-email 1.7.12.rc2.18.g61b472e In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PRECHANGE and POSTCHANGE notifiers must be called in groups, i.e either both should be called or both shouldn't be. In case we have started PRECHANGE notifier and found an error, we must call POSTCHANGE notifier with freqs.new = freqs.old to guarantee that sequence of calling notifiers is complete. Omap driver was taking care of it well, but wasn't restoring freqs.new to freqs.old in some cases. I wasn't required to add code for it as moving PRECHANGE notifier down was a better option, so that we call it just before starting frequency transition. Cc: Santosh Shilimkar Signed-off-by: Viresh Kumar --- drivers/cpufreq/omap-cpufreq.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 0279d18..29468a5 100644 --- a/drivers/cpufreq/omap-cpufreq.c +++ b/drivers/cpufreq/omap-cpufreq.c @@ -93,9 +93,6 @@ static int omap_target(struct cpufreq_policy *policy, if (freqs.old == freqs.new && policy->cur == freqs.new) return ret; - /* notifiers */ - cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); - freq = freqs.new * 1000; ret = clk_round_rate(mpu_clk, freq); if (IS_ERR_VALUE(ret)) { @@ -125,6 +122,9 @@ static int omap_target(struct cpufreq_policy *policy, freqs.old / 1000, volt_old ? volt_old / 1000 : -1, freqs.new / 1000, volt ? volt / 1000 : -1); + /* notifiers */ + cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); + /* scaling up? scale voltage before frequency */ if (mpu_reg && (freqs.new > freqs.old)) { r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol); -- 1.7.12.rc2.18.g61b472e