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Wysocki" , linux-kernel@vger.kernel.org, "MyungJoo Ham )" , Kyungmin Park , Chanwoo Choi , Saravana Kannan Subject: [PATCH v5 1/3] OPP: Add function to look up required OPP's for a given OPP Date: Wed, 3 Feb 2021 17:23:58 +0800 Message-Id: <20210203092400.1791884-2-hsinyi@chromium.org> X-Mailer: git-send-email 2.30.0.365.g02bc693789-goog In-Reply-To: <20210203092400.1791884-1-hsinyi@chromium.org> References: <20210203092400.1791884-1-hsinyi@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Saravana Kannan Add a function that allows looking up required OPPs given a source OPP table, destination OPP table and the source OPP. Signed-off-by: Saravana Kannan Signed-off-by: Hsin-Yi Wang --- drivers/opp/core.c | 58 ++++++++++++++++++++++++++++++++++++++++++ include/linux/pm_opp.h | 11 ++++++++ 2 files changed, 69 insertions(+) diff --git a/drivers/opp/core.c b/drivers/opp/core.c index dc95d29e94c1b..878f066b972cc 100644 --- a/drivers/opp/core.c +++ b/drivers/opp/core.c @@ -2398,6 +2398,64 @@ 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. + * + * This function returns the OPP (present in @dst_table) pointed out by the + * "required-opps" property of the OPP (present in @src_table). + * + * The callers are required to call dev_pm_opp_put() for the returned OPP after + * use. + * + * Return: destination table OPP on success, otherwise NULL on errors. + */ +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 = NULL; + int i; + + if (!src_table || !dst_table || !src_opp || + !src_table->required_opp_tables) + return NULL; + + /* required-opps not fully initialized yet */ + if (lazy_linking_pending(src_table)) + return NULL; + + for (i = 0; i < src_table->required_opp_count; i++) { + if (src_table->required_opp_tables[i] == dst_table) + break; + } + + if (unlikely(i == src_table->required_opp_count)) { + pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", + __func__, src_table, dst_table); + return NULL; + } + + 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); + goto unlock; + } + } + + pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, + dst_table); + +unlock: + mutex_unlock(&src_table->lock); + + return dest_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. diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index ab1d15ce559db..6f5f72a7f601c 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -156,6 +156,9 @@ 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 +370,14 @@ 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 NULL; +} + static inline int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate) { return -EOPNOTSUPP;