From patchwork Mon Jun 17 13:24:23 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Rui X-Patchwork-Id: 2733361 X-Patchwork-Delegate: rui.zhang@intel.com 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 8A7FFC0AB1 for ; Mon, 17 Jun 2013 13:24:52 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 73C9C20316 for ; Mon, 17 Jun 2013 13:24:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C28420333 for ; Mon, 17 Jun 2013 13:24:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756211Ab3FQNYm (ORCPT ); Mon, 17 Jun 2013 09:24:42 -0400 Received: from mga11.intel.com ([192.55.52.93]:50832 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756202Ab3FQNYl (ORCPT ); Mon, 17 Jun 2013 09:24:41 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP; 17 Jun 2013 06:25:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,881,1363158000"; d="scan'208";a="354717241" Received: from unknown (HELO rzhang1-mobl4.ccr.corp.intel.com) ([10.255.20.69]) by fmsmga002.fm.intel.com with ESMTP; 17 Jun 2013 06:24:35 -0700 From: Zhang Rui To: linux-pm@vger.kernel.org Cc: eduardo.valentin@ti.com, durgadoss.r@intel.com, shawn.guo@linaro.org, ruslan.ruslichenko@ti.com, Zhang Rui Subject: [RFC PATCH 1/6] thermal: step_wise: cdev only needs update on a new target state Date: Mon, 17 Jun 2013 21:24:23 +0800 Message-Id: <1371475468-5351-2-git-send-email-rui.zhang@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1371475468-5351-1-git-send-email-rui.zhang@intel.com> References: <1371475468-5351-1-git-send-email-rui.zhang@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-8.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 From: Shawn Guo The cooling device only needs update on a new target state. Since we already check old target in thermal_zone_trip_update(), we can do one more check to see if it's a new target state. If not, we can reasonably save some uncecesary code execution. Signed-off-by: Shawn Guo Acked-by: Eduardo Valentin Signed-off-by: Zhang Rui --- drivers/thermal/step_wise.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c index 4d4ddae..0afbd86 100644 --- a/drivers/thermal/step_wise.c +++ b/drivers/thermal/step_wise.c @@ -133,6 +133,9 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip) old_target = instance->target; instance->target = get_target_state(instance, trend, throttle); + if (old_target == instance->target) + continue; + /* Activate a passive thermal instance */ if (old_target == THERMAL_NO_TARGET && instance->target != THERMAL_NO_TARGET)