From 00ce3873f730fb24c657854ec04374358e711838 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Wed, 4 May 2022 10:17:32 +0200 Subject: opp: Add apis to retrieve opps with interconnect bandwidth Add dev_pm_opp_find_bw_ceil and dev_pm_opp_find_bw_floor to retrieve opps based on interconnect associated with the opp and bandwidth. The index variable is the index of the interconnect as specified in the opp table in Devicetree. Co-developed-by: Thara Gopinath Signed-off-by: Thara Gopinath Signed-off-by: Krzysztof Kozlowski Signed-off-by: Viresh Kumar --- drivers/opp/core.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 120 insertions(+) (limited to 'drivers/opp') diff --git a/drivers/opp/core.c b/drivers/opp/core.c index 6725ff27c35e..48606f52759d 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -729,6 +729,126 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); +/** + * dev_pm_opp_find_bw_ceil() - Search for a rounded ceil bandwidth + * @dev: device for which we do this operation + * @freq: start bandwidth + * @index: which bandwidth to compare, in case of OPPs with several values + * + * Search for the matching floor *available* OPP from a starting bandwidth + * for a device. + * + * Return: matching *opp and refreshes *bw accordingly, 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_bw_ceil(struct device *dev, + unsigned int *bw, int index) +{ + struct opp_table *opp_table; + struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); + + if (!dev || !bw) { + dev_err(dev, "%s: Invalid argument bw=%p\n", __func__, bw); + return ERR_PTR(-EINVAL); + } + + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) + return ERR_CAST(opp_table); + + if (index >= opp_table->path_count) + return ERR_PTR(-EINVAL); + + mutex_lock(&opp_table->lock); + + list_for_each_entry(temp_opp, &opp_table->opp_list, node) { + if (temp_opp->available && temp_opp->bandwidth) { + if (temp_opp->bandwidth[index].peak >= *bw) { + opp = temp_opp; + *bw = opp->bandwidth[index].peak; + + /* 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_bw_ceil); + +/** + * dev_pm_opp_find_bw_floor() - Search for a rounded floor bandwidth + * @dev: device for which we do this operation + * @freq: start bandwidth + * @index: which bandwidth to compare, in case of OPPs with several values + * + * Search for the matching floor *available* OPP from a starting bandwidth + * for a device. + * + * Return: matching *opp and refreshes *bw accordingly, 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_bw_floor(struct device *dev, + unsigned int *bw, int index) +{ + struct opp_table *opp_table; + struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); + + if (!dev || !bw) { + dev_err(dev, "%s: Invalid argument bw=%p\n", __func__, bw); + return ERR_PTR(-EINVAL); + } + + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) + return ERR_CAST(opp_table); + + if (index >= opp_table->path_count) + return ERR_PTR(-EINVAL); + + mutex_lock(&opp_table->lock); + + list_for_each_entry(temp_opp, &opp_table->opp_list, node) { + if (temp_opp->available && temp_opp->bandwidth) { + /* go to the next node, before choosing prev */ + if (temp_opp->bandwidth[index].peak > *bw) + break; + opp = temp_opp; + } + } + + /* Increment the reference count of OPP */ + if (!IS_ERR(opp)) + dev_pm_opp_get(opp); + mutex_unlock(&opp_table->lock); + dev_pm_opp_put_opp_table(opp_table); + + if (!IS_ERR(opp)) + *bw = opp->bandwidth[index].peak; + + return opp; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_find_bw_floor); + static int _set_opp_voltage(struct device *dev, struct regulator *reg, struct dev_pm_opp_supply *supply) { -- cgit v1.2.3