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path: root/drivers/devfreq/devfreq.c
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Diffstat (limited to 'drivers/devfreq/devfreq.c')
-rw-r--r--drivers/devfreq/devfreq.c112
1 files changed, 108 insertions, 4 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index c189b82f5ec..70c31d43fff 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -83,6 +83,7 @@ int update_devfreq(struct devfreq *devfreq)
{
unsigned long freq;
int err = 0;
+ u32 flags = 0;
if (!mutex_is_locked(&devfreq->lock)) {
WARN(true, "devfreq->lock must be locked by the caller.\n");
@@ -94,7 +95,24 @@ int update_devfreq(struct devfreq *devfreq)
if (err)
return err;
- err = devfreq->profile->target(devfreq->dev.parent, &freq);
+ /*
+ * Adjust the freuqency with user freq and QoS.
+ *
+ * List from the highest proiority
+ * max_freq (probably called by thermal when it's too hot)
+ * min_freq
+ */
+
+ if (devfreq->min_freq && freq < devfreq->min_freq) {
+ freq = devfreq->min_freq;
+ flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */
+ }
+ if (devfreq->max_freq && freq > devfreq->max_freq) {
+ freq = devfreq->max_freq;
+ flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
+ }
+
+ err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
if (err)
return err;
@@ -501,12 +519,82 @@ static ssize_t show_central_polling(struct device *dev,
!to_devfreq(dev)->governor->no_central_polling);
}
+static ssize_t store_min_freq(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct devfreq *df = to_devfreq(dev);
+ unsigned long value;
+ int ret;
+ unsigned long max;
+
+ ret = sscanf(buf, "%lu", &value);
+ if (ret != 1)
+ goto out;
+
+ mutex_lock(&df->lock);
+ max = df->max_freq;
+ if (value && max && value > max) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ df->min_freq = value;
+ update_devfreq(df);
+ ret = count;
+unlock:
+ mutex_unlock(&df->lock);
+out:
+ return ret;
+}
+
+static ssize_t show_min_freq(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%lu\n", to_devfreq(dev)->min_freq);
+}
+
+static ssize_t store_max_freq(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct devfreq *df = to_devfreq(dev);
+ unsigned long value;
+ int ret;
+ unsigned long min;
+
+ ret = sscanf(buf, "%lu", &value);
+ if (ret != 1)
+ goto out;
+
+ mutex_lock(&df->lock);
+ min = df->min_freq;
+ if (value && min && value < min) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ df->max_freq = value;
+ update_devfreq(df);
+ ret = count;
+unlock:
+ mutex_unlock(&df->lock);
+out:
+ return ret;
+}
+
+static ssize_t show_max_freq(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%lu\n", to_devfreq(dev)->max_freq);
+}
+
static struct device_attribute devfreq_attrs[] = {
__ATTR(governor, S_IRUGO, show_governor, NULL),
__ATTR(cur_freq, S_IRUGO, show_freq, NULL),
__ATTR(central_polling, S_IRUGO, show_central_polling, NULL),
__ATTR(polling_interval, S_IRUGO | S_IWUSR, show_polling_interval,
store_polling_interval),
+ __ATTR(min_freq, S_IRUGO | S_IWUSR, show_min_freq, store_min_freq),
+ __ATTR(max_freq, S_IRUGO | S_IWUSR, show_max_freq, store_max_freq),
{ },
};
@@ -555,14 +643,30 @@ module_exit(devfreq_exit);
* freq value given to target callback.
* @dev The devfreq user device. (parent of devfreq)
* @freq The frequency given to target function
+ * @flags Flags handed from devfreq framework.
*
*/
-struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq)
+struct opp *devfreq_recommended_opp(struct device *dev, unsigned long *freq,
+ u32 flags)
{
- struct opp *opp = opp_find_freq_ceil(dev, freq);
+ struct opp *opp;
- if (opp == ERR_PTR(-ENODEV))
+ if (flags & DEVFREQ_FLAG_LEAST_UPPER_BOUND) {
+ /* The freq is an upper bound. opp should be lower */
opp = opp_find_freq_floor(dev, freq);
+
+ /* If not available, use the closest opp */
+ if (opp == ERR_PTR(-ENODEV))
+ opp = opp_find_freq_ceil(dev, freq);
+ } else {
+ /* The freq is an lower bound. opp should be higher */
+ opp = opp_find_freq_ceil(dev, freq);
+
+ /* If not available, use the closest opp */
+ if (opp == ERR_PTR(-ENODEV))
+ opp = opp_find_freq_floor(dev, freq);
+ }
+
return opp;
}