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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
parent
8f510aeb22
commit
0fe3a66410
2 changed files with 220 additions and 2 deletions
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@ -189,6 +189,29 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
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return ERR_PTR(-ENODEV);
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}
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static int devfreq_notify_transition(struct devfreq *devfreq,
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struct devfreq_freqs *freqs, unsigned int state)
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{
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if (!devfreq)
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return -EINVAL;
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switch (state) {
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case DEVFREQ_PRECHANGE:
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srcu_notifier_call_chain(&devfreq->transition_notifier_list,
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DEVFREQ_PRECHANGE, freqs);
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break;
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case DEVFREQ_POSTCHANGE:
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srcu_notifier_call_chain(&devfreq->transition_notifier_list,
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DEVFREQ_POSTCHANGE, freqs);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/* Load monitoring helper functions for governors use */
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/**
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@ -200,7 +223,8 @@ static struct devfreq_governor *find_devfreq_governor(const char *name)
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*/
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int update_devfreq(struct devfreq *devfreq)
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{
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unsigned long freq;
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struct devfreq_freqs freqs;
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unsigned long freq, cur_freq;
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int err = 0;
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u32 flags = 0;
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@ -234,10 +258,22 @@ int update_devfreq(struct devfreq *devfreq)
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flags |= DEVFREQ_FLAG_LEAST_UPPER_BOUND; /* Use LUB */
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}
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if (devfreq->profile->get_cur_freq)
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devfreq->profile->get_cur_freq(devfreq->dev.parent, &cur_freq);
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else
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cur_freq = devfreq->previous_freq;
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freqs.old = cur_freq;
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freqs.new = freq;
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_PRECHANGE);
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err = devfreq->profile->target(devfreq->dev.parent, &freq, flags);
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if (err)
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return err;
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freqs.new = freq;
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devfreq_notify_transition(devfreq, &freqs, DEVFREQ_POSTCHANGE);
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if (devfreq->profile->freq_table)
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if (devfreq_update_status(devfreq, freq))
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dev_err(&devfreq->dev,
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@ -542,6 +578,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
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goto err_out;
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}
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srcu_init_notifier_head(&devfreq->transition_notifier_list);
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mutex_unlock(&devfreq->lock);
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mutex_lock(&devfreq_list_lock);
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@ -1310,6 +1348,129 @@ void devm_devfreq_unregister_opp_notifier(struct device *dev,
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}
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EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
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/**
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* devfreq_register_notifier() - Register a driver with devfreq
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* @devfreq: The devfreq object.
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* @nb: The notifier block to register.
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* @list: DEVFREQ_TRANSITION_NOTIFIER.
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*/
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int devfreq_register_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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int ret = 0;
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if (!devfreq)
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return -EINVAL;
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switch (list) {
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case DEVFREQ_TRANSITION_NOTIFIER:
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ret = srcu_notifier_chain_register(
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&devfreq->transition_notifier_list, nb);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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EXPORT_SYMBOL(devfreq_register_notifier);
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/*
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* devfreq_unregister_notifier() - Unregister a driver with devfreq
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* @devfreq: The devfreq object.
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* @nb: The notifier block to be unregistered.
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* @list: DEVFREQ_TRANSITION_NOTIFIER.
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*/
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int devfreq_unregister_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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int ret = 0;
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if (!devfreq)
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return -EINVAL;
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switch (list) {
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case DEVFREQ_TRANSITION_NOTIFIER:
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ret = srcu_notifier_chain_unregister(
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&devfreq->transition_notifier_list, nb);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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EXPORT_SYMBOL(devfreq_unregister_notifier);
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struct devfreq_notifier_devres {
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struct devfreq *devfreq;
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struct notifier_block *nb;
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unsigned int list;
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};
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static void devm_devfreq_notifier_release(struct device *dev, void *res)
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{
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struct devfreq_notifier_devres *this = res;
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devfreq_unregister_notifier(this->devfreq, this->nb, this->list);
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}
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/**
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* devm_devfreq_register_notifier()
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- Resource-managed devfreq_register_notifier()
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* @dev: The devfreq user device. (parent of devfreq)
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* @devfreq: The devfreq object.
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* @nb: The notifier block to be unregistered.
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* @list: DEVFREQ_TRANSITION_NOTIFIER.
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*/
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int devm_devfreq_register_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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struct devfreq_notifier_devres *ptr;
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int ret;
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ptr = devres_alloc(devm_devfreq_notifier_release, sizeof(*ptr),
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GFP_KERNEL);
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if (!ptr)
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return -ENOMEM;
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ret = devfreq_register_notifier(devfreq, nb, list);
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if (ret) {
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devres_free(ptr);
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return ret;
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}
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ptr->devfreq = devfreq;
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ptr->nb = nb;
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ptr->list = list;
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devres_add(dev, ptr);
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return 0;
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}
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EXPORT_SYMBOL(devm_devfreq_register_notifier);
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/**
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* devm_devfreq_unregister_notifier()
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- Resource-managed devfreq_unregister_notifier()
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* @dev: The devfreq user device. (parent of devfreq)
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* @devfreq: The devfreq object.
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* @nb: The notifier block to be unregistered.
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* @list: DEVFREQ_TRANSITION_NOTIFIER.
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*/
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void devm_devfreq_unregister_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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WARN_ON(devres_release(dev, devm_devfreq_notifier_release,
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devm_devfreq_dev_match, devfreq));
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}
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EXPORT_SYMBOL(devm_devfreq_unregister_notifier);
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MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
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MODULE_DESCRIPTION("devfreq class support");
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MODULE_LICENSE("GPL");
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@ -19,6 +19,13 @@
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#define DEVFREQ_NAME_LEN 16
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/* DEVFREQ notifier interface */
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#define DEVFREQ_TRANSITION_NOTIFIER (0)
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/* Transition notifiers of DEVFREQ_TRANSITION_NOTIFIER */
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#define DEVFREQ_PRECHANGE (0)
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#define DEVFREQ_POSTCHANGE (1)
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struct devfreq;
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/**
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@ -143,6 +150,7 @@ struct devfreq_governor {
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* @trans_table: Statistics of devfreq transitions
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* @time_in_state: Statistics of devfreq states
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* @last_stat_updated: The last time stat updated
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* @transition_notifier_list: list head of DEVFREQ_TRANSITION_NOTIFIER notifier
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*
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* This structure stores the devfreq information for a give device.
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*
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@ -177,6 +185,13 @@ struct devfreq {
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unsigned int *trans_table;
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unsigned long *time_in_state;
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unsigned long last_stat_updated;
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struct srcu_notifier_head transition_notifier_list;
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};
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struct devfreq_freqs {
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unsigned long old;
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unsigned long new;
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};
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#if defined(CONFIG_PM_DEVFREQ)
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@ -207,7 +222,20 @@ extern int devm_devfreq_register_opp_notifier(struct device *dev,
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struct devfreq *devfreq);
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extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
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struct devfreq *devfreq);
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extern int devfreq_register_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list);
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extern int devfreq_unregister_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list);
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extern int devm_devfreq_register_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list);
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extern void devm_devfreq_unregister_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list);
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extern struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
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int index);
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@ -310,6 +338,35 @@ static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
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{
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}
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static inline int devfreq_register_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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return 0;
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}
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static inline int devfreq_unregister_notifier(struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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return 0;
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}
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static inline int devm_devfreq_register_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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return 0;
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}
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static inline void devm_devfreq_unregister_notifier(struct device *dev,
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struct devfreq *devfreq,
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struct notifier_block *nb,
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unsigned int list)
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{
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}
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static inline struct devfreq *devfreq_get_devfreq_by_phandle(struct device *dev,
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int index)
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{
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