PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier
This patch adds the new DEVFREQ_TRANSITION_NOTIFIER notifier to send the notification when the frequency of device is changed. This notifier has two state as following: - DEVFREQ_PRECHANGE : Notify it before chaning the frequency of device - DEVFREQ_POSTCHANGE : Notify it after changed the frequency of device And this patch adds the resourced-managed function to release the resource automatically when error happen. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> [m.reichl and linux.amoon: Tested it on exynos4412-odroidu3 board] Tested-by: Markus Reichl <m.reichl@fivetechno.de> Tested-by: Anand Moon <linux.amoon@gmail.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
This commit is contained in:
Chanwoo Choi
MyungJoo Ham
Родитель
8f510aeb22
Коммит
0fe3a66410
|
|
@ -189,6 +189,29 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
|
|||
return ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
static int devfreq_notify_transition(struct devfreq *devfreq,
|
||||
struct devfreq_freqs *freqs, unsigned int state)
|
||||
{
|
||||
if (!devfreq)
|
||||
return -EINVAL;
|
||||
|
||||
switch (state) {
|
||||
case DEVFREQ_PRECHANGE:
|
||||
srcu_notifier_call_chain(&devfreq->transition_notifier_list,
|
||||
DEVFREQ_PRECHANGE, freqs);
|
||||
break;
|
||||
|
||||
case DEVFREQ_POSTCHANGE:
|
||||
srcu_notifier_call_chain(&devfreq->transition_notifier_list,
|
||||
DEVFREQ_POSTCHANGE, freqs);
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Load monitoring helper functions for governors use */
|
||||
|
||||
/**
|
||||
|
|
@ -200,7 +223,8 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
|
|||
*/
|
||||
int update_devfreq(struct devfreq *devfreq)
|
||||
{
|
||||
unsigned long freq;
|
||||
struct devfreq_freqs freqs;
|
||||
unsigned long freq, cur_freq;
|
||||
int err = 0;
|
||||
u32 flags = 0;
|
||||
|
||||
|
|
@ -234,10 +258,22 @@ int update_devfreq(struct devfreq *devfreq)
|
|||
flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
|
||||
}
|
||||
|
||||
if (devfreq->profile->get_cur_freq)
|
||||
devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
|
||||
else
|
||||
cur_freq = devfreq->previous_freq;
|
||||
|
||||
freqs.old = cur_freq;
|
||||
freqs.new = freq;
|
||||
devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
|
||||
|
||||
err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
freqs.new = freq;
|
||||
devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
|
||||
|
||||
if (devfreq->profile->freq_table)
|
||||
if (devfreq_update_status(devfreq, freq))
|
||||
dev_err(&devfreq->dev,
|
||||
|
|
@ -542,6 +578,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
|
|||
goto err_out;
|
||||
}
|
||||
|
||||
srcu_init_notifier_head(&devfreq->transition_notifier_list);
|
||||
|
||||
mutex_unlock(&devfreq->lock);
|
||||
|
||||
mutex_lock(&devfreq_list_lock);
|
||||
|
|
@ -1310,6 +1348,129 @@ void devm_devfreq_unregister_opp_notifier(struct device *dev,
|
|||
}
|
||||
EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
|
||||
|
||||
/**
|
||||
* devfreq_register_notifier() - Register a driver with devfreq
|
||||
* @devfreq: The devfreq object.
|
||||
* @nb: The notifier block to register.
|
||||
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
||||
*/
|
||||
int devfreq_register_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (!devfreq)
|
||||
return -EINVAL;
|
||||
|
||||
switch (list) {
|
||||
case DEVFREQ_TRANSITION_NOTIFIER:
|
||||
ret = srcu_notifier_chain_register(
|
||||
&devfreq->transition_notifier_list, nb);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(devfreq_register_notifier);
|
||||
|
||||
/*
|
||||
* devfreq_unregister_notifier() - Unregister a driver with devfreq
|
||||
* @devfreq: The devfreq object.
|
||||
* @nb: The notifier block to be unregistered.
|
||||
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
||||
*/
|
||||
int devfreq_unregister_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
if (!devfreq)
|
||||
return -EINVAL;
|
||||
|
||||
switch (list) {
|
||||
case DEVFREQ_TRANSITION_NOTIFIER:
|
||||
ret = srcu_notifier_chain_unregister(
|
||||
&devfreq->transition_notifier_list, nb);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL(devfreq_unregister_notifier);
|
||||
|
||||
struct devfreq_notifier_devres {
|
||||
struct devfreq *devfreq;
|
||||
struct notifier_block *nb;
|
||||
unsigned int list;
|
||||
};
|
||||
|
||||
static void devm_devfreq_notifier_release(struct device *dev, void *res)
|
||||
{
|
||||
struct devfreq_notifier_devres *this = res;
|
||||
|
||||
devfreq_unregister_notifier(this->devfreq, this->nb, this->list);
|
||||
}
|
||||
|
||||
/**
|
||||
* devm_devfreq_register_notifier()
|
||||
- Resource-managed devfreq_register_notifier()
|
||||
* @dev: The devfreq user device. (parent of devfreq)
|
||||
* @devfreq: The devfreq object.
|
||||
* @nb: The notifier block to be unregistered.
|
||||
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
||||
*/
|
||||
int devm_devfreq_register_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
struct devfreq_notifier_devres *ptr;
|
||||
int ret;
|
||||
|
||||
ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr),
|
||||
GFP_KERNEL);
|
||||
if (!ptr)
|
||||
return -ENOMEM;
|
||||
|
||||
ret = devfreq_register_notifier(devfreq, nb, list);
|
||||
if (ret) {
|
||||
devres_free(ptr);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ptr->devfreq = devfreq;
|
||||
ptr->nb = nb;
|
||||
ptr->list = list;
|
||||
devres_add(dev, ptr);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(devm_devfreq_register_notifier);
|
||||
|
||||
/**
|
||||
* devm_devfreq_unregister_notifier()
|
||||
- Resource-managed devfreq_unregister_notifier()
|
||||
* @dev: The devfreq user device. (parent of devfreq)
|
||||
* @devfreq: The devfreq object.
|
||||
* @nb: The notifier block to be unregistered.
|
||||
* @list: DEVFREQ_TRANSITION_NOTIFIER.
|
||||
*/
|
||||
void devm_devfreq_unregister_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
|
||||
devm_devfreq_dev_match, devfreq));
|
||||
}
|
||||
EXPORT_SYMBOL(devm_devfreq_unregister_notifier);
|
||||
|
||||
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
|
||||
MODULE_DESCRIPTION("devfreq class support");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
|
|||
|
|
@ -19,6 +19,13 @@
|
|||
|
||||
#define DEVFREQ_NAME_LEN 16
|
||||
|
||||
/* DEVFREQ notifier interface */
|
||||
#define DEVFREQ_TRANSITION_NOTIFIER (0)
|
||||
|
||||
/* Transition notifiers of DEVFREQ_TRANSITION_NOTIFIER */
|
||||
#define DEVFREQ_PRECHANGE (0)
|
||||
#define DEVFREQ_POSTCHANGE (1)
|
||||
|
||||
struct devfreq;
|
||||
|
||||
/**
|
||||
|
|
@ -143,6 +150,7 @@ struct devfreq_governor {
|
|||
* @trans_table: Statistics of devfreq transitions
|
||||
* @time_in_state: Statistics of devfreq states
|
||||
* @last_stat_updated: The last time stat updated
|
||||
* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
|
||||
*
|
||||
* This structure stores the devfreq information for a give device.
|
||||
*
|
||||
|
|
@ -177,6 +185,13 @@ struct devfreq {
|
|||
unsigned int *trans_table;
|
||||
unsigned long *time_in_state;
|
||||
unsigned long last_stat_updated;
|
||||
|
||||
struct srcu_notifier_head transition_notifier_list;
|
||||
};
|
||||
|
||||
struct devfreq_freqs {
|
||||
unsigned long old;
|
||||
unsigned long new;
|
||||
};
|
||||
|
||||
#if defined(CONFIG_PM_DEVFREQ)
|
||||
|
|
@ -207,7 +222,20 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
|
|||
struct devfreq *devfreq);
|
||||
extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
|
||||
struct devfreq *devfreq);
|
||||
|
||||
extern int devfreq_register_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list);
|
||||
extern int devfreq_unregister_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list);
|
||||
extern int devm_devfreq_register_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list);
|
||||
extern void devm_devfreq_unregister_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list);
|
||||
extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
|
||||
int index);
|
||||
|
||||
|
|
@ -310,6 +338,35 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
|
|||
{
|
||||
}
|
||||
|
||||
static inline int devfreq_register_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int devfreq_unregister_notifier(struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int devm_devfreq_register_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void devm_devfreq_unregister_notifier(struct device *dev,
|
||||
struct devfreq *devfreq,
|
||||
struct notifier_block *nb,
|
||||
unsigned int list)
|
||||
{
|
||||
}
|
||||
|
||||
static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
|
||||
int index)
|
||||
{
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче