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Commit 416b46a2 authored by Chanwoo Choi's avatar Chanwoo Choi Committed by MyungJoo Ham
Browse files

PM / devfreq: Show the all available frequencies 



The commit a76caf55 ("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: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
parent ea572f81

drivers/devfreq/devfreq.c

+5 −11
Original line number Diff line number Diff line
@@ -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--;

include/linux/devfreq.h

+3 −2
Original line number Diff line number Diff line
@@ -84,7 +84,8 @@ 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.

 * @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 {