diff mbox

[v4,6/7] cpufreq: Enable software boost only when up to one busy core is running

Message ID 1371661969-7660-7-git-send-email-l.majewski@samsung.com (mailing list archive)
State Changes Requested, archived
Headers show

Commit Message

Lukasz Majewski June 19, 2013, 5:12 p.m. UTC 
This patch adds protection from accidental enable of boost at systems,
which supports software boosting.

Boost software mode can be only enabled when up to one busy (with heavy
load) core is available on the system. Such approach brings extra
protection from over heating.

Moreover the boost is automatically disabled, when cpufreq core detects
more busy cores.

Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>

Changes for v4:
- New patch
---
 drivers/cpufreq/cpufreq.c          |    9 +++++++--
 drivers/cpufreq/cpufreq_governor.c |    3 +++
 2 files changed, 10 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f785273..59d2cac 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -1932,12 +1932,17 @@  static struct notifier_block __refdata cpufreq_cpu_notifier = {
 /*********************************************************************
  *               BOOST						     *
  *********************************************************************/
-static int cpufreq_boost_trigger_state_sw(void)
+static int cpufreq_boost_trigger_state_sw(int state)
 {
 	struct cpufreq_frequency_table *freq_table;
 	struct cpufreq_policy *policy;
 	int ret = -EINVAL;
 
+	if (state && cpufreq_num_busy_cpu() > 1) {
+		boost_enabled = 0;
+		return 0;
+	}
+
 	list_for_each_entry(policy, &cpufreq_policy_list, policy_list) {
 		freq_table = cpufreq_frequency_get_table(policy->cpu);
 		if (freq_table)
@@ -1959,7 +1964,7 @@  int cpufreq_boost_trigger_state(int state)
 		if (cpufreq_driver->enable_boost)
 			ret = cpufreq_driver->enable_boost(state);
 		else
-			ret = cpufreq_boost_trigger_state_sw();
+			ret = cpufreq_boost_trigger_state_sw(state);
 
 		if (ret) {
 			boost_enabled = 0;
diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c
index 3402533..9383ab9 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -162,6 +162,9 @@  void dbs_check_cpu(struct dbs_data *dbs_data, int cpu)
 			max_load = load;
 	}
 
+	if (cpufreq_boost_supported() && cpufreq_num_busy_cpu() > 1)
+		cpufreq_boost_trigger_state(0);
+
 	dbs_data->cdata->gov_check_cpu(cpu, max_load);
 }
 EXPORT_SYMBOL_GPL(dbs_check_cpu);