Piteball
/
android_kernel_samsung_msm8226
mirror of https://github.com/S3NEO/android_kernel_samsung_msm8226.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

PM / devfreq: Add new flag to do simple clock scaling 

Add new flag "simple_scaling" to on demand governor so that
the clocks can be scaled up only when the load is more than
up threshold and can be scaled down only when the load is less
than down differential data as provided within
struct devfreq_simple_ondemand_data.

Change-Id: Ibc6ab6297c1b64b6e6eaaa76d735d0b9ae0f6477
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
This commit is contained in:
Sahitya Tummala 2013-10-21 11:27:13 +05:30 committed by Bryan Huntsman
parent 39808dcbce
commit d2380c6581
2 changed files with 23 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/devfreq/governor_simpleondemand.c
View File

@ -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
include/linux/devfreq.h
View File

@ -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