Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754769AbaBSSgD (ORCPT ); Wed, 19 Feb 2014 13:36:03 -0500 Received: from mail-pb0-f50.google.com ([209.85.160.50]:34546 "EHLO mail-pb0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754486AbaBSSfx (ORCPT ); Wed, 19 Feb 2014 13:35:53 -0500 From: dirk.brandewie@gmail.com To: rjw@rjwysocki.net Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Dirk Brandewie Subject: [PATCH v2] intel_pstate: Use LFM bus ratio as min ratio/P state Date: Wed, 19 Feb 2014 10:35:25 -0800 Message-Id: <1392834925-21648-1-git-send-email-dirk.j.brandewie@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <5856987.3qKttR09W1@vostro.rjw.lan> References: <5856987.3qKttR09W1@vostro.rjw.lan> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dirk Brandewie LFM (max efficiency ratio) is the max frequency at minimum voltage supported by the processor. Using LFM as the minimum P state increases performmance without affecting power. By not using P states below LFM we avoid using P states that are less power efficient. 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 b80c03d..ff45ce1 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -356,7 +356,7 @@ static int byt_get_min_pstate(void) { u64 value; rdmsrl(BYT_RATIOS, value); - return value & 0xFF; + return (value >> 8) & 0xFF; } static int byt_get_max_pstate(void) -- 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/