Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756770AbaF3Q7u (ORCPT ); Mon, 30 Jun 2014 12:59:50 -0400 Received: from sema.semaphore.gr ([78.46.194.137]:53447 "EHLO sema.semaphore.gr" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754658AbaF3Q7q (ORCPT ); Mon, 30 Jun 2014 12:59:46 -0400 From: Stratos Karafotis To: rjw@rjwysocki.net, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] cpufreq: Introduce new relation for freq selection Date: Mon, 30 Jun 2014 19:59:33 +0300 Message-Id: <1404147574-17422-2-git-send-email-stratosk@semaphore.gr> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1404147574-17422-1-git-send-email-stratosk@semaphore.gr> References: <1404147574-17422-1-git-send-email-stratosk@semaphore.gr> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce CPUFREQ_RELATION_C for frequency selection. It selects the frequency with the minimum euclidean distance to target. In case of equal distance between 2 frequencies, it will select the greater frequency. Signed-off-by: Stratos Karafotis --- drivers/cpufreq/freq_table.c | 12 +++++++++++- include/linux/cpufreq.h | 1 + 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c index 1632981..df14766 100644 --- a/drivers/cpufreq/freq_table.c +++ b/drivers/cpufreq/freq_table.c @@ -117,7 +117,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy, .frequency = 0, }; struct cpufreq_frequency_table *pos; - unsigned int freq, i = 0; + unsigned int freq, diff, i = 0; pr_debug("request for target %u kHz (relation: %u) for cpu %u\n", target_freq, relation, policy->cpu); @@ -127,6 +127,7 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy, suboptimal.frequency = ~0; break; case CPUFREQ_RELATION_L: + case CPUFREQ_RELATION_C: optimal.frequency = ~0; break; } @@ -168,6 +169,15 @@ int cpufreq_frequency_table_target(struct cpufreq_policy *policy, } } break; + case CPUFREQ_RELATION_C: + diff = abs(freq - target_freq); + if (diff < optimal.frequency || + (diff == optimal.frequency && + freq > table[optimal.driver_data].frequency)) { + optimal.frequency = diff; + optimal.driver_data = i; + } + break; } } if (optimal.driver_data > i) { diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index ec4112d..00fad91 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -176,6 +176,7 @@ static inline void disable_cpufreq(void) { } #define CPUFREQ_RELATION_L 0 /* lowest frequency at or above target */ #define CPUFREQ_RELATION_H 1 /* highest frequency below or at target */ +#define CPUFREQ_RELATION_C 2 /* closest frequency to target */ struct freq_attr { struct attribute attr; -- 1.9.3 -- 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/