From: Chen Liang <cl@rock-chips.com>
Date: Fri, 1 Jul 2016 07:47:14 +0000 (+0800)
Subject: ARM64: cpufreq_sched: implement event CPUFREQ_GOV_LIMIT for governor
X-Git-Tag: firefly_0821_release~2198
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=d94634b0ab1bd61cc4088de63608287938a8fec2;p=firefly-linux-kernel-4.4.55.git

ARM64: cpufreq_sched: implement event CPUFREQ_GOV_LIMIT for governor

If we do not limit the freqency immediately when the cpu is overheat,
thermal driver will lost the control of temperature. So implement event
CPUFREQ_GOV_LIMIT for governor to limit the freqency immediately.

Change-Id: Id709edd377226417ead92ead2ae3d3d19b3eeabf
Signed-off-by: Chen Liang <cl@rock-chips.com>
---

diff --git a/kernel/sched/cpufreq_sched.c b/kernel/sched/cpufreq_sched.c
index e1d208e101ed..c608a9265d6a 100644
--- a/kernel/sched/cpufreq_sched.c
+++ b/kernel/sched/cpufreq_sched.c
@@ -327,6 +327,20 @@ static int cpufreq_sched_stop(struct cpufreq_policy *policy)
 	return 0;
 }
 
+static int cpufreq_sched_limits(struct cpufreq_policy *policy)
+{
+	if (policy->max < policy->cur)
+		__cpufreq_driver_target(policy,
+					policy->max,
+					CPUFREQ_RELATION_H);
+	else if (policy->min > policy->cur)
+		__cpufreq_driver_target(policy,
+					policy->min,
+					CPUFREQ_RELATION_L);
+
+	return 0;
+}
+
 static int cpufreq_sched_setup(struct cpufreq_policy *policy,
 			       unsigned int event)
 {
@@ -340,7 +354,7 @@ static int cpufreq_sched_setup(struct cpufreq_policy *policy,
 	case CPUFREQ_GOV_STOP:
 		return cpufreq_sched_stop(policy);
 	case CPUFREQ_GOV_LIMITS:
-		break;
+		return cpufreq_sched_limits(policy);
 	}
 	return 0;
 }