From mboxrd@z Thu Jan 1 00:00:00 1970 From: amit.daniel@samsung.com (Amit Daniel Kachhap) Date: Wed, 7 Aug 2013 16:46:11 +0530 Subject: [PATCH] cpufreq: exynos5440: Fix to skip when new frequency same as current Message-ID: <1375874171-16951-1-git-send-email-amit.daniel@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch fixes the issue of un-necessary setting the clock controller when the new target frequency is same as the current one. This case usually occurs with governors like ondemand which passes the target frequency as the percentage of average frequency. This check is present in most of the cpufreq driver. Cc: Viresh Kumar Cc: Rafael J. Wysocki Cc: Kukjin Kim Signed-off-by: Amit Daniel Kachhap --- drivers/cpufreq/exynos5440-cpufreq.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c index 0c74018..d514c15 100644 --- a/drivers/cpufreq/exynos5440-cpufreq.c +++ b/drivers/cpufreq/exynos5440-cpufreq.c @@ -238,6 +238,9 @@ static int exynos_target(struct cpufreq_policy *policy, freqs.old = dvfs_info->cur_frequency; freqs.new = freq_table[index].frequency; + if (freqs.old == freqs.new) + goto out; + cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); /* Set the target frequency in all C0_3_PSTATE register */ -- 1.7.1