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authorChanwoo Choi <cw00.choi@samsung.com>2017-10-23 10:32:10 +0900
committerMyungJoo Ham <myungjoo.ham@samsung.com>2017-10-26 17:08:40 +0900
commit416b46a2627ae8de1466f90787dede6f9c5a1bfa (patch)
treeafe1701ce9bc7b57af453c924e450fbc84acf23b
parentea572f816032bef9ff2641a439a45651a20eab73 (diff)
PM / devfreq: Show the all available frequencies
The commit a76caf55e5b35 ("thermal: Add devfreq cooling") allows the devfreq device to use the cooling device. When the cooling down are required, the devfreq_cooling.c disables the OPP entry with the dev_pm_opp_disable(). In result, 'available_frequencies'[1] sysfs node never came to show the all available frequencies. [1] /sys/class/devfreq/.../available_frequencies So, this patch uses the 'freq_table' in the 'struct devfreq_dev_profile' in order to show the all available frequencies. - If 'freq_table' is NULL, devfreq core initializes them by using OPP values. - If 'freq_table' is initialized, devfreq core just uses the 'freq_table'. And this patch adds some comment about the sort way of 'freq_table'. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
-rw-r--r--drivers/devfreq/devfreq.c16
-rw-r--r--include/linux/devfreq.h5
2 files changed, 8 insertions, 13 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index b2920cd2b78e..381f92e5e794 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1194,22 +1194,16 @@ static ssize_t available_frequencies_show(struct device *d,
char *buf)
{
struct devfreq *df = to_devfreq(d);
- struct device *dev = df->dev.parent;
- struct dev_pm_opp *opp;
ssize_t count = 0;
- unsigned long freq = 0;
+ int i;
- do {
- opp = dev_pm_opp_find_freq_ceil(dev, &freq);
- if (IS_ERR(opp))
- break;
+ mutex_lock(&df->lock);
- dev_pm_opp_put(opp);
+ for (i = 0; i < df->profile->max_state; i++)
count += scnprintf(&buf[count], (PAGE_SIZE - count - 2),
- "%lu ", freq);
- freq++;
- } while (1);
+ "%lu ", df->profile->freq_table[i]);
+ mutex_unlock(&df->lock);
/* Truncate the trailing space */
if (count)
count--;
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 997a9eb34191..19520625ea94 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -84,8 +84,9 @@ struct devfreq_dev_status {
* from devfreq_remove_device() call. If the user
* has registered devfreq->nb at a notifier-head,
* this is the time to unregister it.
- * @freq_table: Optional list of frequencies to support statistics.
- * @max_state: The size of freq_table.
+ * @freq_table: Optional list of frequencies to support statistics
+ * and freq_table must be generated in ascending order.
+ * @max_state: The size of freq_table.
*/
struct devfreq_dev_profile {
unsigned long initial_freq;

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