[PATCH 2/4] PM / Domains: Save OPP table pointer in genpd

[Viresh Kumar]

We will need these going forward in hotpath, i.e. from within
dev_pm_genpd_set_performance_state().

Lets fetch and save them while the OPP tables are added.

Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
 drivers/base/power/domain.c | 23 +++++++++++++++++++++--
 include/linux/pm_domain.h   |  2 ++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 8e554e6a82a2..0d928359b880 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1907,12 +1907,21 @@ int of_genpd_add_provider_simple(struct device_node *np,
                                ret);
                        goto unlock;
                }
+
+               /*
+                * Save table for faster processing while setting performance
+                * state.
+                */
+               genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
+               WARN_ON(!genpd->opp_table);
        }
 
        ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
        if (ret) {
-               if (genpd->set_performance_state)
+               if (genpd->set_performance_state) {
+                       dev_pm_opp_put_opp_table(genpd->opp_table);
                        dev_pm_opp_of_remove_table(&genpd->dev);
+               }
 
                goto unlock;
        }
@@ -1965,6 +1974,13 @@ int of_genpd_add_provider_onecell(struct device_node *np,
                                        i, ret);
                                goto error;
                        }
+
+                       /*
+                        * Save table for faster processing while setting
+                        * performance state.
+                        */
+                       genpd->opp_table = 
dev_pm_opp_get_opp_table_indexed(&genpd->dev, i);
+                       WARN_ON(!genpd->opp_table);
                }
 
                genpd->provider = &np->fwnode;
@@ -1989,8 +2005,10 @@ int of_genpd_add_provider_onecell(struct device_node *np,
                genpd->provider = NULL;
                genpd->has_provider = false;
 
-               if (genpd->set_performance_state)
+               if (genpd->set_performance_state) {
+                       dev_pm_opp_put_opp_table(genpd->opp_table);
                        dev_pm_opp_of_remove_table(&genpd->dev);
+               }
        }
 
        mutex_unlock(&gpd_list_lock);
@@ -2024,6 +2042,7 @@ void of_genpd_del_provider(struct device_node *np)
                                        if (!gpd->set_performance_state)
                                                continue;
 
+                                       
dev_pm_opp_put_opp_table(gpd->opp_table);
                                        dev_pm_opp_of_remove_table(&gpd->dev);
                                }
                        }
diff --git a/include/linux/pm_domain.h b/include/linux/pm_domain.h
index 642036952553..9ad101362aef 100644
--- a/include/linux/pm_domain.h
+++ b/include/linux/pm_domain.h
@@ -73,6 +73,7 @@ struct genpd_power_state {
 
 struct genpd_lock_ops;
 struct dev_pm_opp;
+struct opp_table;
 
 struct generic_pm_domain {
        struct device dev;
@@ -94,6 +95,7 @@ struct generic_pm_domain {
        unsigned int performance_state; /* Aggregated max performance state */
        int (*power_off)(struct generic_pm_domain *domain);
        int (*power_on)(struct generic_pm_domain *domain);
+       struct opp_table *opp_table;    /* OPP table of the genpd */
        unsigned int (*opp_to_performance_state)(struct generic_pm_domain 
*genpd,
                                                 struct dev_pm_opp *opp);
        int (*set_performance_state)(struct generic_pm_domain *genpd,
-- 
2.19.1.568.g152ad8e3369a