diff options
| author | MyungJoo Ham <myungjoo.ham@samsung.com> | 2011-12-09 11:42:19 +0400 |
|---|---|---|
| committer | MyungJoo Ham <myungjoo.ham@samsung.com> | 2012-01-20 05:12:38 +0400 |
| commit | 6530b9dea1b7f33eaf79ba625e3a99f2455f3eb1 (patch) | |
| tree | 70beddf04779d5941ba6ef851b30e02c7fa0c86c /drivers/devfreq/governor_simpleondemand.c | |
| parent | a95e1f5dbca385908aa4087bb98470b0e0ac58d8 (diff) | |
| download | linux-6530b9dea1b7f33eaf79ba625e3a99f2455f3eb1.tar.xz | |
PM / devfreq: add min/max_freq limit requested by users.
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>
Diffstat (limited to 'drivers/devfreq/governor_simpleondemand.c')
| -rw-r--r-- | drivers/devfreq/governor_simpleondemand.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/devfreq/governor_simpleondemand.c b/drivers/devfreq/governor_simpleondemand.c index efad8dcf9028..a2e3eae79011 100644 --- a/drivers/devfreq/governor_simpleondemand.c +++ b/drivers/devfreq/governor_simpleondemand.c @@ -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; } |