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FROMLIST: PM / devfreq: set min/max freq limit from freq table

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Set devfreq device min and max frequency limits when device
is added to devfreq, provided frequency table is supplied.
This helps governors to suggest target frequency with in
limits.

Change-Id: Iab24aef59bfeffcfb3c3118c12ba58e25cd9d479
Signed-off-by: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Patch-mainline: linux-pm @ 01/08/13, 05:50
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>
This commit is contained in:
Rajagopal Venkat 2013-06-11 16:42:27 -06:00 • committed by David Keitel
parent de6ff179a8
commit 4c5ca5ed5b
1 changed files with 24 additions and 0 deletions
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24
drivers/devfreq/devfreq.c
View file

@ -68,6 +68,29 @@ static struct devfreq *find_device_devfreq(struct device *dev)
return ERR_PTR(-ENODEV);
}
/**
* devfreq_set_freq_limits() - Set min and max frequency from freq_table
* @devfreq: the devfreq instance
*/
static void devfreq_set_freq_limits(struct devfreq *devfreq)
{
int idx;
unsigned long min = ~0, max = 0;
if (!devfreq->profile->freq_table)
return;
for (idx = 0; idx < devfreq->profile->max_state; idx++) {
if (min > devfreq->profile->freq_table[idx])
min = devfreq->profile->freq_table[idx];
if (max < devfreq->profile->freq_table[idx])
max = devfreq->profile->freq_table[idx];
}
devfreq->min_freq = min;
devfreq->max_freq = max;
}
/**
* devfreq_get_freq_level() - Lookup freq_table for the frequency
* @devfreq: the devfreq instance
@ -487,6 +510,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
devfreq->profile->max_state,
GFP_KERNEL);
devfreq->last_stat_updated = jiffies;
devfreq_set_freq_limits(devfreq);
dev_set_name(&devfreq->dev, "%s", dev_name(dev));
err = device_register(&devfreq->dev);