diff options
| -rw-r--r-- | drivers/opp/core.c | 55 | ||||
| -rw-r--r-- | include/linux/pm_opp.h | 7 |
2 files changed, 62 insertions, 0 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c index dc95d29e94c1..c3f3d9249cc5 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2399,6 +2399,61 @@ devm_pm_opp_attach_genpd(struct device *dev, const char **names, EXPORT_SYMBOL_GPL(devm_pm_opp_attach_genpd); /** + * dev_pm_opp_xlate_required_opp() - Find required OPP for @src_table OPP. + * @src_table: OPP table which has @dst_table as one of its required OPP table. + * @dst_table: Required OPP table of the @src_table. + * @src_opp: OPP from the @src_table. + * + * This function returns the OPP (present in @dst_table) pointed out by the + * "required-opps" property of the @src_opp (present in @src_table). + * + * The callers are required to call dev_pm_opp_put() for the returned OPP after + * use. + * + * Return: pointer to 'struct dev_pm_opp' on success and errorno otherwise. + */ +struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table, + struct opp_table *dst_table, + struct dev_pm_opp *src_opp) +{ + struct dev_pm_opp *opp, *dest_opp = ERR_PTR(-ENODEV); + int i; + + if (!src_table || !dst_table || !src_opp || + !src_table->required_opp_tables) + return ERR_PTR(-EINVAL); + + /* required-opps not fully initialized yet */ + if (lazy_linking_pending(src_table)) + return ERR_PTR(-EBUSY); + + for (i = 0; i < src_table->required_opp_count; i++) { + if (src_table->required_opp_tables[i] == dst_table) { + mutex_lock(&src_table->lock); + + list_for_each_entry(opp, &src_table->opp_list, node) { + if (opp == src_opp) { + dest_opp = opp->required_opps[i]; + dev_pm_opp_get(dest_opp); + break; + } + } + + mutex_unlock(&src_table->lock); + break; + } + } + + if (IS_ERR(dest_opp)) { + pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, + src_table, dst_table); + } + + return dest_opp; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_xlate_required_opp); + +/** * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. * @src_table: OPP table which has dst_table as one of its required OPP table. * @dst_table: Required OPP table of the src_table. diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index ab1d15ce559d..c0371efa4a0f 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -156,6 +156,7 @@ struct opp_table *devm_pm_opp_register_set_opp_helper(struct device *dev, int (* struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs); void dev_pm_opp_detach_genpd(struct opp_table *opp_table); struct opp_table *devm_pm_opp_attach_genpd(struct device *dev, const char **names, struct device ***virt_devs); +struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table, struct opp_table *dst_table, struct dev_pm_opp *src_opp); int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate); int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq); int dev_pm_opp_set_opp(struct device *dev, struct dev_pm_opp *opp); @@ -367,6 +368,12 @@ static inline struct opp_table *devm_pm_opp_attach_genpd(struct device *dev, return ERR_PTR(-EOPNOTSUPP); } +static inline struct dev_pm_opp *dev_pm_opp_xlate_required_opp(struct opp_table *src_table, + struct opp_table *dst_table, struct dev_pm_opp *src_opp) +{ + return ERR_PTR(-EOPNOTSUPP); +} + static inline int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate) { return -EOPNOTSUPP; |