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

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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>
[venkatg@codeaurora.org: dereference stat variables]
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
Bug: 153569404
(cherry picked from commit 4b185480e88596db66e186534ce4cfc43597e7b9)
Signed-off-by: Saravana Kannan <saravanak@google.com>
This commit is contained in:
Sahitya Tummala 2013-10-21 11:27:13 +05:30 committed by Saravana Kannan
parent 5a23994ca3
commit 5e68c49cb6
2 changed files with 23 additions and 6 deletions
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25
drivers/devfreq/governor_simpleondemand.c
View File

@ -28,6 +28,7 @@ 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;
err = devfreq_update_stats(df);
if (err)
@ -45,18 +46,30 @@ 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

@ -238,6 +238,9 @@ extern struct devfreq *devfreq_get_devfreq_by_phandle(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.
@ -245,6 +248,7 @@ extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
struct devfreq_simple_ondemand_data {
unsigned int upthreshold;
unsigned int downdifferential;
unsigned int simple_scaling;
};
#endif