summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorNiklas Cassel <niklas.cassel@linaro.org>2019-07-25 12:41:29 +0200
committerViresh Kumar <viresh.kumar@linaro.org>2019-07-26 13:24:59 +0530
commit71419d84c216cee8da3b19fb843b4242f112cde4 (patch)
tree8826c9954f665303de987231a2498b14324e0d27
parent17a8f868ae3e85a173843b1ac65e744e8585bc5a (diff)
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>
-rw-r--r--drivers/opp/core.c48
-rw-r--r--include/linux/pm_opp.h8
2 files changed, 56 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index bdb435822401..0ee8c0133d3e 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -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)
{
diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index 5bdceca5125d..b8197ab014f2 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -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)
{