From 8dd5cada393f6f4e825833a6ff05b1f51f36a791 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Mon, 18 Jan 2021 03:55:18 +0300 Subject: 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 Tested-by: Nicolas Chauvet Tested-by: Matt Merhar Signed-off-by: Dmitry Osipenko Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'drivers') diff --git a/drivers/opp/core.c b/drivers/opp/core.c index dc7a298f3611..b29f31146770 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) { -- cgit v1.2.3-59-g8ed1b