diff options
| -rw-r--r-- | drivers/pmdomain/core.c | 124 |
1 files changed, 77 insertions, 47 deletions
diff --git a/drivers/pmdomain/core.c b/drivers/pmdomain/core.c index 18e232b5ed53..8c28d5e50500 100644 --- a/drivers/pmdomain/core.c +++ b/drivers/pmdomain/core.c @@ -311,72 +311,102 @@ 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; +} + +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 = link->prev_performance_state; - link->performance_state = 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; + } + } - 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); + if (genpd->set_performance_state) { + ret = genpd->set_performance_state(genpd, state); + if (ret) { + if (link) + goto rollback_parents_up; + return ret; } + } - genpd_unlock(parent); + /* 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; } |