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Date: Mon, 18 Jan 2021 03:55:18 +0300 From: Dmitry Osipenko <digetx@...il.com> To: Thierry Reding <thierry.reding@...il.com>, Jonathan Hunter <jonathanh@...dia.com>, Mark Brown <broonie@...nel.org>, Liam Girdwood <lgirdwood@...il.com>, Ulf Hansson <ulf.hansson@...aro.org>, Peter Geis <pgwipeout@...il.com>, Nicolas Chauvet <kwizart@...il.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Kevin Hilman <khilman@...nel.org>, Peter De Schrijver <pdeschrijver@...dia.com>, Viresh Kumar <vireshk@...nel.org>, Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>, Yangtao Li <tiny.windzz@...il.com>, Matt Merhar <mattmerhar@...tonmail.com> Cc: linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org Subject: [PATCH v3 06/12] opp: Add dev_pm_opp_find_level_ceil() Add a ceil version of the dev_pm_opp_find_level(). It's handy to have if levels don't start from 0 in OPP table and zero usually means a minimal level. Tested-by: Peter Geis <pgwipeout@...il.com> Tested-by: Nicolas Chauvet <kwizart@...il.com> Tested-by: Matt Merhar <mattmerhar@...tonmail.com> Signed-off-by: Dmitry Osipenko <digetx@...il.com> --- drivers/opp/core.c | 49 ++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 8 +++++++ 2 files changed, 57 insertions(+) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 341484d58e6c..df0969002555 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -449,6 +449,55 @@ struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, } EXPORT_SYMBOL_GPL(dev_pm_opp_find_level_exact); +/** + * dev_pm_opp_find_level_ceil() - search for an rounded up level + * @dev: device for which we do this operation + * @level: level to search for + * + * Return: Searches for rounded up 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_ceil(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->available && temp_opp->level >= *level) { + opp = temp_opp; + *level = opp->level; + + /* 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_ceil); + 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 f344be844bde..b7dc993487c7 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -111,6 +111,8 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, 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_level_ceil(struct device *dev, + unsigned int *level); struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, unsigned long *freq); @@ -234,6 +236,12 @@ static inline struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, return ERR_PTR(-ENOTSUPP); } +static inline struct dev_pm_opp *dev_pm_opp_find_level_ceil(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) { -- 2.29.2
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