summaryrefslogtreecommitdiffstats
path: root/drivers/pmdomain/core.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pmdomain/core.c')
-rw-r--r--drivers/pmdomain/core.c151
1 files changed, 96 insertions, 55 deletions
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c
index 18e232b5ed..c40eda92a8 100644
--- a/drivers/pmdomain/core.c
+++ b/drivers/pmdomain/core.c
@@ -184,6 +184,16 @@ static struct generic_pm_domain *dev_to_genpd(struct device *dev)
return pd_to_genpd(dev->pm_domain);
}
+struct device *dev_to_genpd_dev(struct device *dev)
+{
+ struct generic_pm_domain *genpd = dev_to_genpd(dev);
+
+ if (IS_ERR(genpd))
+ return ERR_CAST(genpd);
+
+ return &genpd->dev;
+}
+
static int genpd_stop_dev(const struct generic_pm_domain *genpd,
struct device *dev)
{
@@ -311,72 +321,102 @@ static int genpd_xlate_performance_state(struct generic_pm_domain *genpd,
}
static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
- unsigned int state, int depth)
+ unsigned int state, int depth);
+
+static void _genpd_rollback_parent_state(struct gpd_link *link, int depth)
{
- struct generic_pm_domain *parent;
- struct gpd_link *link;
- int parent_state, ret;
+ struct generic_pm_domain *parent = link->parent;
+ int parent_state;
- if (state == genpd->performance_state)
- return 0;
+ genpd_lock_nested(parent, depth + 1);
- /* Propagate to parents of genpd */
- list_for_each_entry(link, &genpd->child_links, child_node) {
- parent = link->parent;
+ parent_state = link->prev_performance_state;
+ link->performance_state = parent_state;
- /* Find parent's performance state */
- ret = genpd_xlate_performance_state(genpd, parent, state);
- if (unlikely(ret < 0))
- goto err;
+ parent_state = _genpd_reeval_performance_state(parent, parent_state);
+ if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
+ pr_err("%s: Failed to roll back to %d performance state\n",
+ parent->name, parent_state);
+ }
- parent_state = ret;
+ genpd_unlock(parent);
+}
- genpd_lock_nested(parent, depth + 1);
+static int _genpd_set_parent_state(struct generic_pm_domain *genpd,
+ struct gpd_link *link,
+ unsigned int state, int depth)
+{
+ struct generic_pm_domain *parent = link->parent;
+ int parent_state, ret;
- link->prev_performance_state = link->performance_state;
- link->performance_state = parent_state;
- parent_state = _genpd_reeval_performance_state(parent,
- parent_state);
- ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
- if (ret)
- link->performance_state = link->prev_performance_state;
+ /* Find parent's performance state */
+ ret = genpd_xlate_performance_state(genpd, parent, state);
+ if (unlikely(ret < 0))
+ return ret;
- genpd_unlock(parent);
+ parent_state = ret;
- if (ret)
- goto err;
- }
+ genpd_lock_nested(parent, depth + 1);
- if (genpd->set_performance_state) {
- ret = genpd->set_performance_state(genpd, state);
- if (ret)
- goto err;
- }
+ link->prev_performance_state = link->performance_state;
+ link->performance_state = parent_state;
- genpd->performance_state = state;
- return 0;
+ parent_state = _genpd_reeval_performance_state(parent, parent_state);
+ ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
+ if (ret)
+ link->performance_state = link->prev_performance_state;
-err:
- /* Encountered an error, lets rollback */
- list_for_each_entry_continue_reverse(link, &genpd->child_links,
- child_node) {
- parent = link->parent;
+ genpd_unlock(parent);
- genpd_lock_nested(parent, depth + 1);
+ return ret;
+}
- parent_state = link->prev_performance_state;
- link->performance_state = parent_state;
+static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
+ unsigned int state, int depth)
+{
+ struct gpd_link *link = NULL;
+ int ret;
+
+ if (state == genpd->performance_state)
+ return 0;
- parent_state = _genpd_reeval_performance_state(parent,
- parent_state);
- if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
- pr_err("%s: Failed to roll back to %d performance state\n",
- parent->name, parent_state);
+ /* When scaling up, propagate to parents first in normal order */
+ if (state > genpd->performance_state) {
+ list_for_each_entry(link, &genpd->child_links, child_node) {
+ ret = _genpd_set_parent_state(genpd, link, state, depth);
+ if (ret)
+ goto rollback_parents_up;
}
+ }
- genpd_unlock(parent);
+ if (genpd->set_performance_state) {
+ ret = genpd->set_performance_state(genpd, state);
+ if (ret) {
+ if (link)
+ goto rollback_parents_up;
+ return ret;
+ }
}
+ /* When scaling down, propagate to parents last in reverse order */
+ if (state < genpd->performance_state) {
+ list_for_each_entry_reverse(link, &genpd->child_links, child_node) {
+ ret = _genpd_set_parent_state(genpd, link, state, depth);
+ if (ret)
+ goto rollback_parents_down;
+ }
+ }
+
+ genpd->performance_state = state;
+ return 0;
+
+rollback_parents_up:
+ list_for_each_entry_continue_reverse(link, &genpd->child_links, child_node)
+ _genpd_rollback_parent_state(link, depth);
+ return ret;
+rollback_parents_down:
+ list_for_each_entry_continue(link, &genpd->child_links, child_node)
+ _genpd_rollback_parent_state(link, depth);
return ret;
}
@@ -1100,6 +1140,7 @@ static int __init genpd_power_off_unused(void)
return 0;
}
+ pr_info("genpd: Disabling unused power domains\n");
mutex_lock(&gpd_list_lock);
list_for_each_entry(genpd, &gpd_list, gpd_list_node)
@@ -2235,7 +2276,7 @@ static DEFINE_MUTEX(of_genpd_mutex);
* to be a valid pointer to struct generic_pm_domain.
*/
static struct generic_pm_domain *genpd_xlate_simple(
- struct of_phandle_args *genpdspec,
+ const struct of_phandle_args *genpdspec,
void *data)
{
return data;
@@ -2252,7 +2293,7 @@ static struct generic_pm_domain *genpd_xlate_simple(
* the genpd_onecell_data struct when registering the provider.
*/
static struct generic_pm_domain *genpd_xlate_onecell(
- struct of_phandle_args *genpdspec,
+ const struct of_phandle_args *genpdspec,
void *data)
{
struct genpd_onecell_data *genpd_data = data;
@@ -2495,7 +2536,7 @@ EXPORT_SYMBOL_GPL(of_genpd_del_provider);
* on failure.
*/
static struct generic_pm_domain *genpd_get_from_provider(
- struct of_phandle_args *genpdspec)
+ const struct of_phandle_args *genpdspec)
{
struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
struct of_genpd_provider *provider;
@@ -2526,7 +2567,7 @@ static struct generic_pm_domain *genpd_get_from_provider(
* Looks-up an I/O PM domain based upon phandle args provided and adds
* the device to the PM domain. Returns a negative error code on failure.
*/
-int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
+int of_genpd_add_device(const struct of_phandle_args *genpdspec, struct device *dev)
{
struct generic_pm_domain *genpd;
int ret;
@@ -2560,8 +2601,8 @@ EXPORT_SYMBOL_GPL(of_genpd_add_device);
* provided and adds the subdomain to the parent PM domain. Returns a
* negative error code on failure.
*/
-int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
- struct of_phandle_args *subdomain_spec)
+int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
+ const struct of_phandle_args *subdomain_spec)
{
struct generic_pm_domain *parent, *subdomain;
int ret;
@@ -2598,8 +2639,8 @@ EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
* provided and removes the subdomain from the parent PM domain. Returns a
* negative error code on failure.
*/
-int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,
- struct of_phandle_args *subdomain_spec)
+int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
+ const struct of_phandle_args *subdomain_spec)
{
struct generic_pm_domain *parent, *subdomain;
int ret;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 11:26:40 +0000