linux-kernel - [PATCH 64/70] cpufreq: interactive: prevents the frequency to directly raise above the hispeed

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Message-Id: <1445967059-6897-64-git-send-email-czoborbalint@gmail.com>
Date:	Tue, 27 Oct 2015 18:30:52 +0100
From:	Bálint Czobor <czoborbalint@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Ruchi Kandoi <kandoiruchi@...gle.com>,
	Bálint Czobor <czoborbalint@...il.com>
Subject: [PATCH 64/70] cpufreq: interactive: prevents the frequency to directly raise above the hispeed_freq from a lower frequency.

From: Ruchi Kandoi <kandoiruchi@...gle.com>

When the load was below go_hispeed_load, there is a possibility that
choose_freq() would return a frequency which would be higher than the
hispeed_freq. According to the policy we should first jump to the
hispeed_freq, stay there for above_hispeed_delay and then be allowed to
raise higher than that.

Added a check to prevent the frequency to be directly raised to
something higher than the hispeed_freq.

Change-Id: Icda5d848dd9beadcc18835082ddf269732c75bd0
Signed-off-by: Ruchi Kandoi <kandoiruchi@...gle.com>
Signed-off-by: Bálint Czobor <czoborbalint@...il.com>
---
 drivers/cpufreq/cpufreq_interactive.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpufreq/cpufreq_interactive.c b/drivers/cpufreq/cpufreq_interactive.c
index 6c4b6a8..f0e6fe2 100644
--- a/drivers/cpufreq/cpufreq_interactive.c
+++ b/drivers/cpufreq/cpufreq_interactive.c
@@ -377,6 +377,9 @@ static void cpufreq_interactive_timer(unsigned long data)
 		}
 	} else {
 		new_freq = choose_freq(pcpu, loadadjfreq);
+		if (new_freq > tunables->hispeed_freq &&
+				pcpu->target_freq < tunables->hispeed_freq)
+			new_freq = tunables->hispeed_freq;
 	}
 
 	if (pcpu->target_freq >= tunables->hispeed_freq &&
-- 
1.7.9.5

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