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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>
This commit is contained in:
Niklas Cassel 2019-07-25 12:41:29 +02:00 committed by Viresh Kumar
parent 17a8f868ae
commit 71419d84c2
2 changed files with 56 additions and 0 deletions
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48
drivers/opp/core.c
View File

@ -401,6 +401,54 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
/**
* dev_pm_opp_find_level_exact() - search for an exact level
* @dev: device for which we do this operation
* @level: level to search for
*
* Return: Searches for exact match in the opp table and returns pointer to the
* matching opp if found, else returns ERR_PTR in case of error and should
* be handled using IS_ERR. Error return values can be:
* EINVAL: for bad pointer
* ERANGE: no match found for search
* ENODEV: if device not found in list of registered devices
*
* The callers are required to call dev_pm_opp_put() for the returned OPP after
* use.
*/
struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
unsigned int level)
{
struct opp_table *opp_table;
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
opp_table = _find_opp_table(dev);
if (IS_ERR(opp_table)) {
int r = PTR_ERR(opp_table);
dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r);
return ERR_PTR(r);
}
mutex_lock(&opp_table->lock);
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
if (temp_opp->level == level) {
opp = temp_opp;
/* Increment the reference count of OPP */
dev_pm_opp_get(opp);
break;
}
}
mutex_unlock(&opp_table->lock);
dev_pm_opp_put_opp_table(opp_table);
return opp;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact);
static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
unsigned long *freq)
{

8
include/linux/pm_opp.h
View File

@ -96,6 +96,8 @@ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev);
struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
unsigned long freq,
bool available);
struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
unsigned int level);
struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
unsigned long *freq);
@ -200,6 +202,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
return ERR_PTR(-ENOTSUPP);
}
static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev,
unsigned int level)
{
return ERR_PTR(-ENOTSUPP);
}
static inline struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev,
unsigned long *freq)
{