linux-kernel - [PATCH v4 1/4] PM / devfreq: Export devfreq_get_freq

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Message-Id: <20220511093554.17535-2-cw00.choi@samsung.com>
Date:   Wed, 11 May 2022 18:35:51 +0900
From:   Chanwoo Choi <cwchoi00@...il.com>
To:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     johnson.wang@...iatek.com, mka@...omium.org, wenst@...omium.org,
        jia-wei.chang@...iatek.com, andrew-sh.cheng@...iatek.com,
        hsinyi@...omium.org, saravanak@...gle.com, cw00.choi@...sung.com,
        myungjoo.ham@...sung.com, kyungmin.park@...sung.com
Subject: [PATCH v4 1/4] PM / devfreq: Export devfreq_get_freq_range symbol within devfreq

In order to get frequency range within devfreq governors,
export devfreq_get_freq_range symbol within devfreq.

Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
Tested-by: Chen-Yu Tsai <wenst@...omium.org>
Tested-by: Johnson Wang <johnson.wang@...iatek.com>
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/devfreq/devfreq.c  | 20 ++++++++++++--------
 drivers/devfreq/governor.h |  2 ++
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index a525a609dfc6..01474daf4548 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -112,16 +112,16 @@ static unsigned long find_available_max_freq(struct devfreq *devfreq)
 }
 
 /**
- * get_freq_range() - Get the current freq range
+ * devfreq_get_freq_range() - Get the current freq range
  * @devfreq:	the devfreq instance
  * @min_freq:	the min frequency
  * @max_freq:	the max frequency
  *
  * This takes into consideration all constraints.
  */
-static void get_freq_range(struct devfreq *devfreq,
-			   unsigned long *min_freq,
-			   unsigned long *max_freq)
+void devfreq_get_freq_range(struct devfreq *devfreq,
+			    unsigned long *min_freq,
+			    unsigned long *max_freq)
 {
 	unsigned long *freq_table = devfreq->profile->freq_table;
 	s32 qos_min_freq, qos_max_freq;
@@ -158,6 +158,7 @@ static void get_freq_range(struct devfreq *devfreq,
 	if (*min_freq > *max_freq)
 		*min_freq = *max_freq;
 }
+EXPORT_SYMBOL(devfreq_get_freq_range);
 
 /**
  * devfreq_get_freq_level() - Lookup freq_table for the frequency
@@ -418,7 +419,7 @@ int devfreq_update_target(struct devfreq *devfreq, unsigned long freq)
 	err = devfreq->governor->get_target_freq(devfreq, &freq);
 	if (err)
 		return err;
-	get_freq_range(devfreq, &min_freq, &max_freq);
+	devfreq_get_freq_range(devfreq, &min_freq, &max_freq);
 
 	if (freq < min_freq) {
 		freq = min_freq;
@@ -785,6 +786,7 @@ struct devfreq *devfreq_add_device(struct device *dev,
 {
 	struct devfreq *devfreq;
 	struct devfreq_governor *governor;
+	unsigned long min_freq, max_freq;
 	int err = 0;
 
 	if (!dev || !profile || !governor_name) {
@@ -849,6 +851,8 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		goto err_dev;
 	}
 
+	devfreq_get_freq_range(devfreq, &min_freq, &max_freq);
+
 	devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev);
 	devfreq->opp_table = dev_pm_opp_get_opp_table(dev);
 	if (IS_ERR(devfreq->opp_table))
@@ -1587,7 +1591,7 @@ static ssize_t min_freq_show(struct device *dev, struct device_attribute *attr,
 	unsigned long min_freq, max_freq;
 
 	mutex_lock(&df->lock);
-	get_freq_range(df, &min_freq, &max_freq);
+	devfreq_get_freq_range(df, &min_freq, &max_freq);
 	mutex_unlock(&df->lock);
 
 	return sprintf(buf, "%lu\n", min_freq);
@@ -1641,7 +1645,7 @@ static ssize_t max_freq_show(struct device *dev, struct device_attribute *attr,
 	unsigned long min_freq, max_freq;
 
 	mutex_lock(&df->lock);
-	get_freq_range(df, &min_freq, &max_freq);
+	devfreq_get_freq_range(df, &min_freq, &max_freq);
 	mutex_unlock(&df->lock);
 
 	return sprintf(buf, "%lu\n", max_freq);
@@ -1955,7 +1959,7 @@ static int devfreq_summary_show(struct seq_file *s, void *data)
 
 		mutex_lock(&devfreq->lock);
 		cur_freq = devfreq->previous_freq;
-		get_freq_range(devfreq, &min_freq, &max_freq);
+		devfreq_get_freq_range(devfreq, &min_freq, &max_freq);
 		timer = devfreq->profile->timer;
 
 		if (IS_SUPPORTED_ATTR(devfreq->governor->attrs, POLLING_INTERVAL))
diff --git a/drivers/devfreq/governor.h b/drivers/devfreq/governor.h
index 002a7d67e39d..b0dbfee8bbf2 100644
--- a/drivers/devfreq/governor.h
+++ b/drivers/devfreq/governor.h
@@ -89,6 +89,8 @@ int devm_devfreq_add_governor(struct device *dev,
 
 int devfreq_update_status(struct devfreq *devfreq, unsigned long freq);
 int devfreq_update_target(struct devfreq *devfreq, unsigned long freq);
+void devfreq_get_freq_range(struct devfreq *devfreq, unsigned long *min_freq,
+			    unsigned long *max_freq);
 
 static inline int devfreq_update_stats(struct devfreq *df)
 {
-- 
2.25.1