@@ -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",
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 <jszhang@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(-)