From patchwork Tue Mar 8 09:31:14 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: plongepe X-Patchwork-Id: 8530981 X-Patchwork-Delegate: rjw@sisk.pl Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id C924E9F8A8 for ; Tue, 8 Mar 2016 09:30:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 081532017E for ; Tue, 8 Mar 2016 09:30:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E75DB2010B for ; Tue, 8 Mar 2016 09:30:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932253AbcCHJaP (ORCPT ); Tue, 8 Mar 2016 04:30:15 -0500 Received: from mga01.intel.com ([192.55.52.88]:48091 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932227AbcCHJaP (ORCPT ); Tue, 8 Mar 2016 04:30:15 -0500 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 08 Mar 2016 01:30:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.22,556,1449561600"; d="scan'208";a="665708898" Received: from tllab185.tl.intel.com ([10.102.161.63]) by FMSMGA003.fm.intel.com with ESMTP; 08 Mar 2016 01:30:12 -0800 From: Philippe Longepe To: linux-pm@vger.kernel.org Cc: srinivas.pandruvada@linux.intel.com, rafael@kernel.org Subject: [PATCH V6 1/4] intel_pstate: Remove extra conversions in pid calculation Date: Tue, 8 Mar 2016 10:31:14 +0100 Message-Id: <1457429481-13283-3-git-send-email-philippe.longepe@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1457429481-13283-1-git-send-email-philippe.longepe@linux.intel.com> References: <1457429481-13283-1-git-send-email-philippe.longepe@linux.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=-6.9 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 pid->setpoint and pid->deadband can be initialized in fixed point, so we can avoid the int_tofp in pid_calc. Signed-off-by: Philippe Longepe --- drivers/cpufreq/intel_pstate.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index eb0aef0..114e4e0 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -198,8 +198,8 @@ static struct perf_limits *limits = &powersave_limits; static inline void pid_reset(struct _pid *pid, int setpoint, int busy, int deadband, int integral) { - pid->setpoint = setpoint; - pid->deadband = deadband; + pid->setpoint = int_tofp(setpoint); + pid->deadband = int_tofp(deadband); pid->integral = int_tofp(integral); pid->last_err = int_tofp(setpoint) - int_tofp(busy); } @@ -225,9 +225,9 @@ static signed int pid_calc(struct _pid *pid, int32_t busy) int32_t pterm, dterm, fp_error; int32_t integral_limit; - fp_error = int_tofp(pid->setpoint) - busy; + fp_error = pid->setpoint - busy; - if (abs(fp_error) <= int_tofp(pid->deadband)) + if (abs(fp_error) <= pid->deadband) return 0; pterm = mul_fp(pid->p_gain, fp_error);