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author | Niklas Cassel <niklas.cassel@linaro.org> | 2019-07-25 12:41:29 +0200 |
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committer | Viresh Kumar <viresh.kumar@linaro.org> | 2019-07-26 13:24:59 +0530 |
commit | 71419d84c216cee8da3b19fb843b4242f112cde4 (patch) | |
tree | 8826c9954f665303de987231a2498b14324e0d27 /drivers | |
parent | 17a8f868ae3e85a173843b1ac65e744e8585bc5a (diff) | |
download | linux-71419d84c216cee8da3b19fb843b4242f112cde4.tar.gz linux-71419d84c216cee8da3b19fb843b4242f112cde4.tar.bz2 linux-71419d84c216cee8da3b19fb843b4242f112cde4.zip |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/opp/core.c | 48 |
1 files changed, 48 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) { |