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Subject[PATCH V2 4/9] OPP: Populate OPPs from "required-opps" property
Date
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.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/opp/core.c | 1 +
drivers/opp/of.c | 81 ++++++++++++++++++++++++++++++++++++++++++++--
drivers/opp/opp.h | 6 ++++
3 files changed, 86 insertions(+), 2 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 85174a5c4850..02a69a62dac8 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -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);
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index b5605196122a..ffaeefef98ce 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -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);

diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 024e1be23d37..24b340ad18d1 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -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
--
2.18.0.rc1.242.g61856ae69a2c
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