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PM / devfreq: add min/max_freq limit requested by users.

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The frequency requested to devfreq device driver from devfreq governors
is restricted by min_freq and max_freq input.

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
MyungJoo Ham
2011-12-09 16:42:19 +09:00
parent a95e1f5dbc
commit 6530b9dea1
6 changed files with 101 additions and 8 deletions
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12
drivers/devfreq/governor_simpleondemand.c
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@@ -25,6 +25,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
unsigned int dfso_upthreshold = DFSO_UPTHRESHOLD;
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;
if (err)
return err;
@@ -41,7 +42,7 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
/* Assume MAX if it is going to be divided by zero */
if (stat.total_time == 0) {
*freq = UINT_MAX;
*freq = max;
return 0;
}
@@ -54,13 +55,13 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
/* Set MAX if it's busy enough */
if (stat.busy_time * 100 >
stat.total_time * dfso_upthreshold) {
*freq = UINT_MAX;
*freq = max;
return 0;
}
/* Set MAX if we do not know the initial frequency */
if (stat.current_frequency == 0) {
*freq = UINT_MAX;
*freq = max;
return 0;
}
@@ -79,6 +80,11 @@ static int devfreq_simple_ondemand_func(struct devfreq *df,
b = div_u64(b, (dfso_upthreshold - dfso_downdifferential / 2));
*freq = (unsigned long) b;
if (df->min_freq && *freq < df->min_freq)
*freq = df->min_freq;
if (df->max_freq && *freq > df->max_freq)
*freq = df->max_freq;
return 0;
}