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PM / devfreq: Use the available min/max frequency

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The commit a76caf55e5 ("thermal: Add devfreq cooling") is able
to disable OPP as a cooling device. In result, both update_devfreq()
and {min|max}_freq_show() have to consider the 'opp->available'
status of each OPP.

So, this patch adds the 'scaling_{min|max}_freq' to struct devfreq
in order to indicate the available mininum and maximum frequency
by adjusting OPP interface such as dev_pm_opp_{disable|enable}().
The 'scaling_{min|max}_freq' are used for on both update_devfreq()
and {min|max}_freq_show().

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Chanwoo Choi 2017-10-23 10:32:08 +09:00 committed by MyungJoo Ham
parent 1051e2c304
commit f1d981eaec
2 changed files with 36 additions and 8 deletions
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40
drivers/devfreq/devfreq.c
View file

@ -28,6 +28,9 @@
#include <linux/of.h>
#include "governor.h"
#define MAX(a,b) ((a > b) ? a : b)
#define MIN(a,b) ((a < b) ? a : b)
static struct class *devfreq_class;
/*
@ -255,7 +258,7 @@ static int devfreq_notify_transition(struct devfreq *devfreq,
int update_devfreq(struct devfreq *devfreq)
{
struct devfreq_freqs freqs;
unsigned long freq, cur_freq;
unsigned long freq, cur_freq, min_freq, max_freq;
int err = 0;
u32 flags = 0;
@ -273,19 +276,21 @@ int update_devfreq(struct devfreq *devfreq)
return err;
/*
* Adjust the frequency with user freq and QoS.
* Adjust the frequency with user freq, QoS and available freq.
*
* List from the highest priority
* max_freq
* min_freq
*/
max_freq = MIN(devfreq->scaling_max_freq, devfreq->max_freq);
min_freq = MAX(devfreq->scaling_min_freq, devfreq->min_freq);
if (devfreq->min_freq && freq < devfreq->min_freq) {
freq = devfreq->min_freq;
if (min_freq && freq < min_freq) {
freq = min_freq;
flags &= ~DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use GLB */
}
if (devfreq->max_freq && freq > devfreq->max_freq) {
freq = devfreq->max_freq;
if (max_freq && freq > max_freq) {
freq = max_freq;
flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
}
@ -494,6 +499,19 @@ static int devfreq_notifier_call(struct notifier_block *nb, unsigned long type,
int ret;
mutex_lock(&devfreq->lock);
devfreq->scaling_min_freq = find_available_min_freq(devfreq);
if (!devfreq->scaling_min_freq) {
mutex_unlock(&devfreq->lock);
return -EINVAL;
}
devfreq->scaling_max_freq = find_available_max_freq(devfreq);
if (!devfreq->scaling_max_freq) {
mutex_unlock(&devfreq->lock);
return -EINVAL;
}
ret = update_devfreq(devfreq);
mutex_unlock(&devfreq->lock);
@ -593,6 +611,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
err = -EINVAL;
goto err_dev;
}
devfreq->scaling_min_freq = devfreq->min_freq;
devfreq->max_freq = find_available_max_freq(devfreq);
if (!devfreq->max_freq) {
@ -600,6 +619,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
err = -EINVAL;
goto err_dev;
}
devfreq->scaling_max_freq = devfreq->max_freq;
dev_set_name(&devfreq->dev, "devfreq%d",
atomic_inc_return(&devfreq_no));
@ -1127,7 +1147,9 @@ static ssize_t min_freq_store(struct device *dev, struct device_attribute *attr,
static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", to_devfreq(dev)->min_freq);
struct devfreq *df = to_devfreq(dev);
return sprintf(buf, "%lu\n", MAX(df->scaling_min_freq, df->min_freq));
}
static ssize_t max_freq_store(struct device *dev, struct device_attribute *attr,
@ -1161,7 +1183,9 @@ static DEVICE_ATTR_RW(min_freq);
static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%lu\n", to_devfreq(dev)->max_freq);
struct devfreq *df = to_devfreq(dev);
return sprintf(buf, "%lu\n", MIN(df->scaling_max_freq, df->max_freq));
}
static DEVICE_ATTR_RW(max_freq);

4
include/linux/devfreq.h
View file

@ -120,6 +120,8 @@ struct devfreq_dev_profile {
* touch this.
* @min_freq: Limit minimum frequency requested by user (0: none)
* @max_freq: Limit maximum frequency requested by user (0: none)
* @scaling_min_freq: Limit minimum frequency requested by OPP interface
* @scaling_max_freq: Limit maximum frequency requested by OPP interface
* @stop_polling: devfreq polling status of a device.
* @total_trans: Number of devfreq transitions
* @trans_table: Statistics of devfreq transitions
@ -153,6 +155,8 @@ struct devfreq {
unsigned long min_freq;
unsigned long max_freq;
unsigned long scaling_min_freq;
unsigned long scaling_max_freq;
bool stop_polling;
/* information for device frequency transition */