Commit 7d8658ef authored by Saravana Kannan's avatar Saravana Kannan Committed by Viresh Kumar
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OPP: Add function to look up required OPP's for a given OPP 



Add a function that allows looking up required OPPs given a source OPP
table, destination OPP table and the source OPP.

Signed-off-by: default avatarSaravana Kannan <saravanak@google.com>
Signed-off-by: default avatarHsin-Yi Wang <hsinyi@chromium.org>
[ Viresh: Rearranged code, fixed return errors ]
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 1d614920

drivers/opp/core.c

+55 −0
Original line number Diff line number Diff line
@@ -2398,6 +2398,61 @@ 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.

include/linux/pm_opp.h

+7 −0
Original line number Diff line number Diff line
@@ -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;