Merge "PM / devfreq: Add new flag to do simple clock scaling" (00119d12) · Commits · e / devices / android_kernel_sony_msm8994

drivers/devfreq/governor_simpleondemand.c

+19 −6

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
		unsigned int dfso_downdifferential = DFSO_DOWNDIFFERENCTIAL;
		struct devfreq_simple_ondemand_data *data = df->data;
		unsigned long max = (df->max_freq) ? df->max_freq : UINT_MAX;
		unsigned long min = (df->min_freq) ? df->min_freq : 0;

		if (err)
		return err;
		@@ -43,18 +44,30 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
		dfso_upthreshold < dfso_downdifferential)
		return -EINVAL;

		/* Assume MAX if it is going to be divided by zero */
		if (stat.total_time == 0) {
		*freq = max;
		return 0;
		}

		/* Prevent overflow */
		if (stat.busy_time >= (1 << 24) \|\| stat.total_time >= (1 << 24)) {
		stat.busy_time >>= 7;
		stat.total_time >>= 7;
		}

		if (data && data->simple_scaling) {
		if (stat.busy_time * 100 >
		stat.total_time * dfso_upthreshold)
		*freq = max;
		else if (stat.busy_time * 100 <
		stat.total_time * dfso_downdifferential)
		*freq = min;
		else
		*freq = df->previous_freq;
		return 0;
		}

		/* Assume MAX if it is going to be divided by zero */
		if (stat.total_time == 0) {
		*freq = max;
		return 0;
		}

		/* Set MAX if it's busy enough */
		if (stat.busy_time * 100 >
		stat.total_time * dfso_upthreshold) {

+4 −0

Original line number	Diff line number	Diff line
		@@ -228,6 +228,9 @@ extern int devfreq_unregister_opp_notifier(struct device *dev,
		* the governor may consider slowing the frequency down.
		* Specify 0 to use the default. Valid value = 0 to 100.
		* downdifferential < upthreshold must hold.
		* @simple_scaling: Setting this flag will scale the clocks up only if the
		* load is above @upthreshold and will scale the clocks
		* down only if the load is below @downdifferential.
		*
		* If the fed devfreq_simple_ondemand_data pointer is NULL to the governor,
		* the governor uses the default values.
		@@ -235,6 +238,7 @@ extern int devfreq_unregister_opp_notifier(struct device *dev,
		struct devfreq_simple_ondemand_data {
		unsigned int upthreshold;
		unsigned int downdifferential;
		unsigned int simple_scaling;
		};
		#endif