[PATCH v2] PM / OPP: optimize dev_pm_opp_set_rate() performance a bit

[Jisheng Zhang]

In dev_pm_opp_set_rate(), _find_opp_table() is called 4 times: once by
_get_opp_clk(), once by dev_pm_opp_set_rate() itself, and twice by
dev_pm_opp_find_freq_ceil(). If there are several opp_tables in the
system, three times of opp table finding is a big waste. This patch
reduced the call of _find_opp_table() to twice.

Signed-off-by: Jisheng Zhang <jszh...@marvell.com>
---
Since v1:
 - avoid opp_table pointer usage after the rcu_read_unlock() as pointed
   out by Viresh, thus we can only reduced the call of _find_opp_table
   to twice.

 drivers/base/power/opp/core.c | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 7c04c87..cde7514 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -402,6 +402,22 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct 
device *dev,
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact);
 
+static struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table,
+                                         unsigned long *freq)
+{
+       struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
+
+       list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
+               if (temp_opp->available && temp_opp->rate >= *freq) {
+                       opp = temp_opp;
+                       *freq = opp->rate;
+                       break;
+               }
+       }
+
+       return opp;
+}
+
 /**
  * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq
  * @dev:       device for which we do this operation
@@ -427,7 +443,6 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device 
*dev,
                                             unsigned long *freq)
 {
        struct opp_table *opp_table;
-       struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE);
 
        opp_rcu_lockdep_assert();
 
@@ -440,15 +455,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device 
*dev,
        if (IS_ERR(opp_table))
                return ERR_CAST(opp_table);
 
-       list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) {
-               if (temp_opp->available && temp_opp->rate >= *freq) {
-                       opp = temp_opp;
-                       *freq = opp->rate;
-                       break;
-               }
-       }
-
-       return opp;
+       return _find_freq_ceil(opp_table, freq);
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil);
 
@@ -612,7 +619,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long 
target_freq)
                return PTR_ERR(opp_table);
        }
 
-       old_opp = dev_pm_opp_find_freq_ceil(dev, &old_freq);
+       old_opp = _find_freq_ceil(opp_table, &old_freq);
        if (!IS_ERR(old_opp)) {
                ou_volt = old_opp->u_volt;
                ou_volt_min = old_opp->u_volt_min;
@@ -622,7 +629,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long 
target_freq)
                        __func__, old_freq, PTR_ERR(old_opp));
        }
 
-       opp = dev_pm_opp_find_freq_ceil(dev, &freq);
+       opp = _find_freq_ceil(opp_table, &freq);
        if (IS_ERR(opp)) {
                ret = PTR_ERR(opp);
                dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n",
-- 
2.8.1