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.
Signed-off-by: Rajagopal Venkat <rajagopal.ven...@linaro.org>
---
drivers/devfreq/devfreq.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a8f0173..5782c9b 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -69,6 +69,29 @@ static struct devfreq *find_device_devfreq(struct device
*dev)
}
/**
+ * 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
* @freq: the target frequency
@@ -476,6 +499,7 @@ 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, dev_name(dev));
err = device_register(&devfreq->dev);
--
1.7.10.4
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