From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Muckle Subject: [PATCH v3 3/3] cpufreq: acpi-cpufreq: use cached frequency mapping when possible Date: Wed, 13 Jul 2016 13:25:27 -0700 Message-ID: <1468441527-23534-4-git-send-email-smuckle@linaro.org> References: <1468441527-23534-1-git-send-email-smuckle@linaro.org> Return-path: Received: from mail-pa0-f54.google.com ([209.85.220.54]:36791 "EHLO mail-pa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750996AbcGMUZq (ORCPT ); Wed, 13 Jul 2016 16:25:46 -0400 Received: by mail-pa0-f54.google.com with SMTP id pp5so14118334pac.3 for ; Wed, 13 Jul 2016 13:25:45 -0700 (PDT) In-Reply-To: <1468441527-23534-1-git-send-email-smuckle@linaro.org> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Peter Zijlstra , Ingo Molnar , "Rafael J . Wysocki" , Viresh Kumar Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Vincent Guittot , Morten Rasmussen , Dietmar Eggemann , Juri Lelli , Patrick Bellasi , Steve Muckle A call to cpufreq_driver_resolve_freq will cache the mapping from the desired target frequency to the frequency table index. If there is a mapping for the desired target frequency then use it instead of looking up the mapping again. Signed-off-by: Steve Muckle --- drivers/cpufreq/acpi-cpufreq.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 11c9a078e0fd..297e9128fe9f 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -473,7 +473,10 @@ unsigned int acpi_cpufreq_fast_switch(struct cpufreq_policy *policy, /* * Find the closest frequency above target_freq. */ - index = cpufreq_table_find_index_dl(policy, target_freq); + if (policy->cached_target_freq == target_freq) + index = policy->cached_resolved_idx; + else + index = cpufreq_table_find_index_dl(policy, target_freq); entry = &policy->freq_table[index]; next_freq = entry->frequency; -- 2.7.3