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Diffstat (limited to 'drivers/opp')
-rw-r--r--drivers/opp/core.c88
-rw-r--r--drivers/opp/of.c16
-rw-r--r--drivers/opp/opp.h4
3 files changed, 107 insertions, 1 deletions
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 02a69a62dac8..cef2ccda355d 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -823,6 +823,7 @@ static struct opp_table *_allocate_opp_table(struct device *dev, int index)
return NULL;
mutex_init(&opp_table->lock);
+ mutex_init(&opp_table->genpd_virt_dev_lock);
INIT_LIST_HEAD(&opp_table->dev_list);
opp_dev = _add_opp_dev(dev, opp_table);
@@ -920,6 +921,7 @@ static void _opp_table_kref_release(struct kref *kref)
_remove_opp_dev(opp_dev, opp_table);
}
+ mutex_destroy(&opp_table->genpd_virt_dev_lock);
mutex_destroy(&opp_table->lock);
list_del(&opp_table->node);
kfree(opp_table);
@@ -1603,6 +1605,92 @@ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table)
EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper);
/**
+ * dev_pm_opp_set_genpd_virt_dev - Set virtual genpd device for an index
+ * @dev: Consumer device for which the genpd device is getting set.
+ * @virt_dev: virtual genpd device.
+ * @index: index.
+ *
+ * Multiple generic power domains for a device are supported with the help of
+ * virtual genpd devices, which are created for each consumer device - genpd
+ * pair. These are the device structures which are attached to the power domain
+ * and are required by the OPP core to set the performance state of the genpd.
+ *
+ * This helper will normally be called by the consumer driver of the device
+ * "dev", as only that has details of the genpd devices.
+ *
+ * This helper needs to be called once for each of those virtual devices, but
+ * only if multiple domains are available for a device. Otherwise the original
+ * device structure will be used instead by the OPP core.
+ */
+struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev,
+ struct device *virt_dev,
+ int index)
+{
+ struct opp_table *opp_table;
+
+ opp_table = dev_pm_opp_get_opp_table(dev);
+ if (!opp_table)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&opp_table->genpd_virt_dev_lock);
+
+ if (unlikely(!opp_table->genpd_virt_devs ||
+ index >= opp_table->required_opp_count ||
+ opp_table->genpd_virt_devs[index])) {
+
+ dev_err(dev, "Invalid request to set required device\n");
+ dev_pm_opp_put_opp_table(opp_table);
+ mutex_unlock(&opp_table->genpd_virt_dev_lock);
+
+ return ERR_PTR(-EINVAL);
+ }
+
+ opp_table->genpd_virt_devs[index] = virt_dev;
+ mutex_unlock(&opp_table->genpd_virt_dev_lock);
+
+ return opp_table;
+}
+
+/**
+ * dev_pm_opp_put_genpd_virt_dev() - Releases resources blocked for genpd device.
+ * @opp_table: OPP table returned by dev_pm_opp_set_genpd_virt_dev().
+ * @virt_dev: virtual genpd device.
+ *
+ * This releases the resource previously acquired with a call to
+ * dev_pm_opp_set_genpd_virt_dev(). The consumer driver shall call this helper
+ * if it doesn't want OPP core to update performance state of a power domain
+ * anymore.
+ */
+void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table,
+ struct device *virt_dev)
+{
+ int i;
+
+ /*
+ * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting
+ * used in parallel.
+ */
+ mutex_lock(&opp_table->genpd_virt_dev_lock);
+
+ for (i = 0; i < opp_table->required_opp_count; i++) {
+ if (opp_table->genpd_virt_devs[i] != virt_dev)
+ continue;
+
+ opp_table->genpd_virt_devs[i] = NULL;
+ dev_pm_opp_put_opp_table(opp_table);
+
+ /* Drop the vote */
+ dev_pm_genpd_set_performance_state(virt_dev, 0);
+ break;
+ }
+
+ mutex_unlock(&opp_table->genpd_virt_dev_lock);
+
+ if (unlikely(i == opp_table->required_opp_count))
+ dev_err(virt_dev, "Failed to find required device entry\n");
+}
+
+/**
* dev_pm_opp_add() - Add an OPP table from a table definitions
* @dev: device for which we do this operation
* @freq: Frequency in Hz for this OPP
diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index ffaeefef98ce..71aef28953c2 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -134,6 +134,7 @@ static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
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)
@@ -147,8 +148,10 @@ static void _opp_table_free_required_tables(struct opp_table *opp_table)
}
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;
}
@@ -161,6 +164,7 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
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;
@@ -175,11 +179,21 @@ static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
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)
+ 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;
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 24b340ad18d1..8aec38792cae 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -135,6 +135,8 @@ enum opp_table_access {
* @parsed_static_opps: True if OPPs are initialized from DT.
* @shared_opp: OPP is shared between multiple devices.
* @suspend_opp: Pointer to OPP to be used during device suspend.
+ * @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers.
+ * @genpd_virt_devs: List of virtual devices for multiple genpd support.
* @required_opp_tables: List of device OPP tables that are required by OPPs in
* this table.
* @required_opp_count: Number of required devices.
@@ -177,6 +179,8 @@ struct opp_table {
enum opp_table_access shared_opp;
struct dev_pm_opp *suspend_opp;
+ struct mutex genpd_virt_dev_lock;
+ struct device **genpd_virt_devs;
struct opp_table **required_opp_tables;
unsigned int required_opp_count;