opp: Add dev_pm_opp_find_level_exact()
Since the performance states in the OPP table are unique, implement a dev_pm_opp_find_level_exact() in order to be able to fetch a specific OPP. Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org> [ Viresh: Updated commit log ] Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
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@ -401,6 +401,54 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
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/**
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* dev_pm_opp_find_level_exact() - search for an exact level
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* @dev: device for which we do this operation
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* @level: level to search for
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*
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* Return: Searches for exact match in the opp table and returns pointer to the
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* matching opp if found, else returns ERR_PTR in case of error and should
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* be handled using IS_ERR. Error return values can be:
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* EINVAL: for bad pointer
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* ERANGE: no match found for search
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* ENODEV: if device not found in list of registered devices
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*
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* The callers are required to call dev_pm_opp_put() for the returned OPP after
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* use.
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*/
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struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
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unsigned int level)
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{
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struct opp_table *opp_table;
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struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
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opp_table = _find_opp_table(dev);
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if (IS_ERR(opp_table)) {
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int r = PTR_ERR(opp_table);
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dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
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return ERR_PTR(r);
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}
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mutex_lock(&opp_table->lock);
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list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
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if (temp_opp->level == level) {
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opp = temp_opp;
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/* Increment the reference count of OPP */
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dev_pm_opp_get(opp);
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break;
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}
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}
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mutex_unlock(&opp_table->lock);
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dev_pm_opp_put_opp_table(opp_table);
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return opp;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
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static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
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unsigned long *freq)
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{
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@ -96,6 +96,8 @@ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
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struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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unsigned long freq,
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bool available);
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struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
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unsigned int level);
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struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq);
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@ -200,6 +202,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
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unsigned int level)
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{
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return ERR_PTR(-ENOTSUPP);
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}
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static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
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unsigned long *freq)
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{
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