Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753530AbaBLSBk (ORCPT ); Wed, 12 Feb 2014 13:01:40 -0500 Received: from mail-pa0-f47.google.com ([209.85.220.47]:33775 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752707AbaBLSBf (ORCPT ); Wed, 12 Feb 2014 13:01:35 -0500 From: dirk.brandewie@gmail.com To: linux-pm@vger.kernel.org, rjw@rjwysocki.net Cc: linux-kernel@vger.kernel.org, Dirk Brandewie Subject: [PATCH 3/5] intel_pstate: fix pid_reset to use fixed point values Date: Wed, 12 Feb 2014 10:01:05 -0800 Message-Id: <1392228067-14817-4-git-send-email-dirk.j.brandewie@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1392228067-14817-1-git-send-email-dirk.j.brandewie@intel.com> References: <1392228067-14817-1-git-send-email-dirk.j.brandewie@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dirk Brandewie commit d253d2a526 Improve accuracy by not truncating until final result, changed internal variables of the PID to be fixed point numbers. Update the pid_reset() to reflect this change. Signed-off-by: Dirk Brandewie --- drivers/cpufreq/intel_pstate.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index d692b10..b80c03d 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -150,7 +150,7 @@ static inline void pid_reset(struct _pid *pid, int setpoint, int busy, pid->setpoint = setpoint; pid->deadband = deadband; pid->integral = int_tofp(integral); - pid->last_err = setpoint - busy; + pid->last_err = int_tofp(setpoint) - int_tofp(busy); } static inline void pid_p_gain_set(struct _pid *pid, int percent) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/