Commit da544b61 authored by Viresh Kumar's avatar Viresh Kumar
Browse files

OPP: Populate OPPs from "required-opps" property 



An earlier commit populated the OPP tables from the "required-opps"
property, this commit populates the individual OPPs. This is repeated
for each OPP in the OPP table and these populated OPPs will be used by
later commits.

Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 5d6d106f

drivers/opp/core.c

+1 −0
Original line number Diff line number Diff line
@@ -976,6 +976,7 @@ static void _opp_kref_release(struct kref *kref) 
	 * frequency/voltage list.

	 */

	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp);

	_of_opp_free_required_opps(opp_table, opp);

	opp_debug_remove_one(opp);

	list_del(&opp->node);

	kfree(opp);

drivers/opp/of.c

+79 −2
Original line number Diff line number Diff line
@@ -259,6 +259,77 @@ void _of_clear_opp_table(struct opp_table *opp_table) 
	_opp_table_free_required_tables(opp_table);

}



/*

 * Release all resources previously acquired with a call to

 * _of_opp_alloc_required_opps().

 */

void _of_opp_free_required_opps(struct opp_table *opp_table,

				struct dev_pm_opp *opp)

{

	struct dev_pm_opp **required_opps = opp->required_opps;

	int i;



	if (!required_opps)

		return;



	for (i = 0; i < opp_table->required_opp_count; i++) {

		if (!required_opps[i])

			break;



		/* Put the reference back */

		dev_pm_opp_put(required_opps[i]);

	}



	kfree(required_opps);

	opp->required_opps = NULL;

}



/* Populate all required OPPs which are part of "required-opps" list */

static int _of_opp_alloc_required_opps(struct opp_table *opp_table,

				       struct dev_pm_opp *opp)

{

	struct dev_pm_opp **required_opps;

	struct opp_table *required_table;

	struct device_node *np;

	int i, ret, count = opp_table->required_opp_count;



	if (!count)

		return 0;



	required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);

	if (!required_opps)

		return -ENOMEM;



	opp->required_opps = required_opps;



	for (i = 0; i < count; i++) {

		required_table = opp_table->required_opp_tables[i];



		np = of_parse_required_opp(opp->np, i);

		if (unlikely(!np)) {

			ret = -ENODEV;

			goto free_required_opps;

		}



		required_opps[i] = _find_opp_of_np(required_table, np);

		of_node_put(np);



		if (!required_opps[i]) {

			pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",

			       __func__, opp->np, i);

			ret = -ENODEV;

			goto free_required_opps;

		}

	}



	return 0;



free_required_opps:

	_of_opp_free_required_opps(opp_table, opp);



	return ret;

}



static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,

			      struct device_node *np)

{
@@ -503,6 +574,10 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, 
	new_opp->dynamic = false;

	new_opp->available = true;



	ret = _of_opp_alloc_required_opps(opp_table, new_opp);

	if (ret)

		goto free_opp;



	if (!of_property_read_u32(np, "clock-latency-ns", &val))

		new_opp->clock_latency_ns = val;
@@ -510,14 +585,14 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, 


	ret = opp_parse_supplies(new_opp, dev, opp_table);

	if (ret)

		goto free_opp;

		goto free_required_opps;



	ret = _opp_add(dev, new_opp, opp_table, rate_not_available);

	if (ret) {

		/* Don't return error for duplicate OPPs */

		if (ret == -EBUSY)

			ret = 0;

		goto free_opp;

		goto free_required_opps;

	}



	/* OPP to select on device suspend */
@@ -547,6 +622,8 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, 
	blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);

	return new_opp;



free_required_opps:

	_of_opp_free_required_opps(opp_table, new_opp);

free_opp:

	_opp_free(new_opp);

drivers/opp/opp.h

+6 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ extern struct list_head opp_tables; 
 * @supplies:	Power supplies voltage/current values

 * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's

 *		frequency from any other OPP's frequency.

 * @required_opps: List of OPPs that are required by this OPP.

 * @opp_table:	points back to the opp_table struct this opp belongs to

 * @np:		OPP's device node.

 * @dentry:	debugfs dentry pointer (per opp)
@@ -84,6 +85,7 @@ struct dev_pm_opp { 


	unsigned long clock_latency_ns;



	struct dev_pm_opp **required_opps;

	struct opp_table *opp_table;



	struct device_node *np;
@@ -216,10 +218,14 @@ void _put_opp_list_kref(struct opp_table *opp_table); 
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index);

void _of_clear_opp_table(struct opp_table *opp_table);

struct opp_table *_managed_opp(struct device *dev, int index);

void _of_opp_free_required_opps(struct opp_table *opp_table,

				struct dev_pm_opp *opp);

#else

static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {}

static inline void _of_clear_opp_table(struct opp_table *opp_table) {}

static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; }

static inline void _of_opp_free_required_opps(struct opp_table *opp_table,

					      struct dev_pm_opp *opp) {}

#endif



#ifdef CONFIG_DEBUG_FS

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