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-rw-r--r--drivers/opp/of.c319
1 files changed, 278 insertions, 41 deletions
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index 6eb0198ab63d..06f0f632ec47 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -73,6 +73,167 @@ struct opp_table *_managed_opp(struct device *dev, int index)
return managed_table;
}
+/* The caller must call dev_pm_opp_put() after the OPP is used */
+static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
+ struct device_node *opp_np)
+{
+ struct dev_pm_opp *opp;
+
+ lockdep_assert_held(&opp_table_lock);
+
+ mutex_lock(&opp_table->lock);
+
+ list_for_each_entry(opp, &opp_table->opp_list, node) {
+ if (opp->np == opp_np) {
+ dev_pm_opp_get(opp);
+ mutex_unlock(&opp_table->lock);
+ return opp;
+ }
+ }
+
+ mutex_unlock(&opp_table->lock);
+
+ return NULL;
+}
+
+static struct device_node *of_parse_required_opp(struct device_node *np,
+ int index)
+{
+ struct device_node *required_np;
+
+ required_np = of_parse_phandle(np, "required-opps", index);
+ if (unlikely(!required_np)) {
+ pr_err("%s: Unable to parse required-opps: %pOF, index: %d\n",
+ __func__, np, index);
+ }
+
+ return required_np;
+}
+
+/* The caller must call dev_pm_opp_put_opp_table() after the table is used */
+static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
+{
+ struct opp_table *opp_table;
+ struct device_node *opp_table_np;
+
+ lockdep_assert_held(&opp_table_lock);
+
+ opp_table_np = of_get_parent(opp_np);
+ if (!opp_table_np)
+ goto err;
+
+ /* It is safe to put the node now as all we need now is its address */
+ of_node_put(opp_table_np);
+
+ list_for_each_entry(opp_table, &opp_tables, node) {
+ if (opp_table_np == opp_table->np) {
+ _get_opp_table_kref(opp_table);
+ return opp_table;
+ }
+ }
+
+err:
+ return ERR_PTR(-ENODEV);
+}
+
+/* Free resources previously acquired by _opp_table_alloc_required_tables() */
+static void _opp_table_free_required_tables(struct opp_table *opp_table)
+{
+ struct opp_table **required_opp_tables = opp_table->required_opp_tables;
+ struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
+ int i;
+
+ if (!required_opp_tables)
+ return;
+
+ for (i = 0; i < opp_table->required_opp_count; i++) {
+ if (IS_ERR_OR_NULL(required_opp_tables[i]))
+ break;
+
+ dev_pm_opp_put_opp_table(required_opp_tables[i]);
+ }
+
+ kfree(required_opp_tables);
+ kfree(genpd_virt_devs);
+
+ opp_table->required_opp_count = 0;
+ opp_table->genpd_virt_devs = NULL;
+ opp_table->required_opp_tables = NULL;
+}
+
+/*
+ * Populate all devices and opp tables which are part of "required-opps" list.
+ * Checking only the first OPP node should be enough.
+ */
+static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
+ struct device *dev,
+ struct device_node *opp_np)
+{
+ struct opp_table **required_opp_tables;
+ struct device **genpd_virt_devs = NULL;
+ struct device_node *required_np, *np;
+ int count, i;
+
+ /* Traversing the first OPP node is all we need */
+ np = of_get_next_available_child(opp_np, NULL);
+ if (!np) {
+ dev_err(dev, "Empty OPP table\n");
+ return;
+ }
+
+ count = of_count_phandle_with_args(np, "required-opps", NULL);
+ if (!count)
+ goto put_np;
+
+ if (count > 1) {
+ genpd_virt_devs = kcalloc(count, sizeof(*genpd_virt_devs),
+ GFP_KERNEL);
+ if (!genpd_virt_devs)
+ goto put_np;
+ }
+
+ required_opp_tables = kcalloc(count, sizeof(*required_opp_tables),
+ GFP_KERNEL);
+ if (!required_opp_tables) {
+ kfree(genpd_virt_devs);
+ goto put_np;
+ }
+
+ opp_table->genpd_virt_devs = genpd_virt_devs;
+ opp_table->required_opp_tables = required_opp_tables;
+ opp_table->required_opp_count = count;
+
+ for (i = 0; i < count; i++) {
+ required_np = of_parse_required_opp(np, i);
+ if (!required_np)
+ goto free_required_tables;
+
+ required_opp_tables[i] = _find_table_of_opp_np(required_np);
+ of_node_put(required_np);
+
+ if (IS_ERR(required_opp_tables[i]))
+ goto free_required_tables;
+
+ /*
+ * We only support genpd's OPPs in the "required-opps" for now,
+ * as we don't know how much about other cases. Error out if the
+ * required OPP doesn't belong to a genpd.
+ */
+ if (!required_opp_tables[i]->is_genpd) {
+ dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
+ required_np);
+ goto free_required_tables;
+ }
+ }
+
+ goto put_np;
+
+free_required_tables:
+ _opp_table_free_required_tables(opp_table);
+put_np:
+ of_node_put(np);
+}
+
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
int index)
{
@@ -92,6 +253,9 @@ void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
of_property_read_u32(np, "voltage-tolerance",
&opp_table->voltage_tolerance_v1);
+ if (of_find_property(np, "#power-domain-cells", NULL))
+ opp_table->is_genpd = true;
+
/* Get OPP table node */
opp_np = _opp_of_get_opp_desc_node(np, index);
of_node_put(np);
@@ -106,9 +270,86 @@ void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
opp_table->np = opp_np;
+ _opp_table_alloc_required_tables(opp_table, dev, opp_np);
of_node_put(opp_np);
}
+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)
{
@@ -338,8 +579,7 @@ static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
ret = of_property_read_u64(np, "opp-hz", &rate);
if (ret < 0) {
/* "opp-hz" is optional for devices like power domains. */
- if (!of_find_property(dev->of_node, "#power-domain-cells",
- NULL)) {
+ if (!opp_table->is_genpd) {
dev_err(dev, "%s: opp-hz not found\n", __func__);
goto free_opp;
}
@@ -366,21 +606,26 @@ 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;
- new_opp->pstate = of_genpd_opp_to_performance_state(dev, np);
-
ret = opp_parse_supplies(new_opp, dev, opp_table);
if (ret)
- goto free_opp;
+ goto free_required_opps;
+
+ if (opp_table->is_genpd)
+ new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp);
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 */
@@ -410,6 +655,8 @@ 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);
@@ -739,58 +986,48 @@ put_cpu_node:
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
/**
- * of_dev_pm_opp_find_required_opp() - Search for required OPP.
- * @dev: The device whose OPP node is referenced by the 'np' DT node.
+ * of_get_required_opp_performance_state() - Search for required OPP and return its performance state.
* @np: Node that contains the "required-opps" property.
+ * @index: Index of the phandle to parse.
*
- * Returns the OPP of the device 'dev', whose phandle is present in the "np"
- * node. Although the "required-opps" property supports having multiple
- * phandles, this helper routine only parses the very first phandle in the list.
- *
- * Return: Matching opp, else returns ERR_PTR in case of error and should be
- * handled using IS_ERR.
+ * Returns the performance state of the OPP pointed out by the "required-opps"
+ * property at @index in @np.
*
- * The callers are required to call dev_pm_opp_put() for the returned OPP after
- * use.
+ * Return: Zero or positive performance state on success, otherwise negative
+ * value on errors.
*/
-struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev,
- struct device_node *np)
+int of_get_required_opp_performance_state(struct device_node *np, int index)
{
- struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ENODEV);
+ struct dev_pm_opp *opp;
struct device_node *required_np;
struct opp_table *opp_table;
+ int pstate = -EINVAL;
- opp_table = _find_opp_table(dev);
- if (IS_ERR(opp_table))
- return ERR_CAST(opp_table);
+ required_np = of_parse_required_opp(np, index);
+ if (!required_np)
+ return -EINVAL;
- required_np = of_parse_phandle(np, "required-opps", 0);
- if (unlikely(!required_np)) {
- dev_err(dev, "Unable to parse required-opps\n");
- goto put_opp_table;
+ opp_table = _find_table_of_opp_np(required_np);
+ if (IS_ERR(opp_table)) {
+ pr_err("%s: Failed to find required OPP table %pOF: %ld\n",
+ __func__, np, PTR_ERR(opp_table));
+ goto put_required_np;
}
- mutex_lock(&opp_table->lock);
-
- list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
- if (temp_opp->available && temp_opp->np == required_np) {
- opp = temp_opp;
-
- /* Increment the reference count of OPP */
- dev_pm_opp_get(opp);
- break;
- }
+ opp = _find_opp_of_np(opp_table, required_np);
+ if (opp) {
+ pstate = opp->pstate;
+ dev_pm_opp_put(opp);
}
- mutex_unlock(&opp_table->lock);
+ dev_pm_opp_put_opp_table(opp_table);
+put_required_np:
of_node_put(required_np);
-put_opp_table:
- dev_pm_opp_put_opp_table(opp_table);
- return opp;
+ return pstate;
}
-EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp);
+EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
/**
* dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp