From 6be4cb0755b900fac5322b9ab8b32e6c7c504e8d Mon Sep 17 00:00:00 2001
From: Saravana Kannan <skannan@codeaurora.org>
Date: Thu, 7 Aug 2014 20:04:45 -0700
Subject: [PATCH] PM / devfreq: devbw: Add suspend/resume APIs

Absence of traffic is guaranteed when the device sitting behind a devbw
device is suspended. In such cases, it is a waste of power to make non-zero
bandwidth votes or to scale the devbw device. So, provide APIs to
suspend/resume the devbw device as needed.

Change-Id: Id58072aec7a9710eb917f248d9b9bd08d3a1ec6a
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
---
 drivers/devfreq/devfreq_devbw.c  | 22 +++++++++++++++++-----
 include/soc/qcom/devfreq_devbw.h | 10 ++++++++++
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/devfreq/devfreq_devbw.c b/drivers/devfreq/devfreq_devbw.c
index 091238f253e1..b6b87fc29255 100644
--- a/drivers/devfreq/devfreq_devbw.c
+++ b/drivers/devfreq/devfreq_devbw.c
@@ -214,11 +214,6 @@ int devfreq_add_devbw(struct device *dev)
 	return 0;
 }
 
-static int devfreq_devbw_probe(struct platform_device *pdev)
-{
-	return devfreq_add_devbw(&pdev->dev);
-}
-
 int devfreq_remove_devbw(struct device *dev)
 {
 	struct dev_data *d = dev_get_drvdata(dev);
@@ -227,6 +222,23 @@ int devfreq_remove_devbw(struct device *dev)
 	return 0;
 }
 
+int devfreq_suspend_devbw(struct device *dev)
+{
+	struct dev_data *d = dev_get_drvdata(dev);
+	return devfreq_suspend_device(d->df);
+}
+
+int devfreq_resume_devbw(struct device *dev)
+{
+	struct dev_data *d = dev_get_drvdata(dev);
+	return devfreq_resume_device(d->df);
+}
+
+static int devfreq_devbw_probe(struct platform_device *pdev)
+{
+	return devfreq_add_devbw(&pdev->dev);
+}
+
 static int devfreq_devbw_remove(struct platform_device *pdev)
 {
 	return devfreq_remove_devbw(&pdev->dev);
diff --git a/include/soc/qcom/devfreq_devbw.h b/include/soc/qcom/devfreq_devbw.h
index 77f816cddf6b..7edb2abba487 100644
--- a/include/soc/qcom/devfreq_devbw.h
+++ b/include/soc/qcom/devfreq_devbw.h
@@ -19,6 +19,8 @@
 #ifdef CONFIG_MSM_DEVFREQ_DEVBW
 int devfreq_add_devbw(struct device *dev);
 int devfreq_remove_devbw(struct device *dev);
+int devfreq_suspend_devbw(struct device *dev);
+int devfreq_resume_devbw(struct device *dev);
 #else
 static inline int devfreq_add_devbw(struct device *dev)
 {
@@ -28,6 +30,14 @@ static inline int devfreq_remove_devbw(struct device *dev)
 {
 	return 0;
 }
+static inline int devfreq_suspend_devbw(struct device *dev)
+{
+	return 0;
+}
+static inline int devfreq_resume_devbw(struct device *dev)
+{
+	return 0;
+}
 #endif
 
 #endif /* _DEVFREQ_DEVBW_H */