linux-kernel - [PATCH V2 2/3] PM / Runtime: Implement the pm_generic_runtime functions for CONFIG

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Message-Id: <1386682662-17633-3-git-send-email-ulf.hansson@linaro.org>
Date:	Tue, 10 Dec 2013 14:37:41 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	linux-pm@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Kevin Hilman <khilman@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH V2 2/3] PM / Runtime: Implement the pm_generic_runtime functions for CONFIG_PM

The pm_generic_runtime_suspend|resume functions were implemented within
CONFIG_PM_RUNTIME.

As we also may use runtime PM callbacks during system suspend, to put
devices into low power state, we need to move the implementation of
pm_generic_runtime_suspend|resume to CONFIG_PM.

This change gives a power domain provision to invoke a platform
driver's runtime PM callback from a power domain's system PM callback.
This were earlier prevented by the platform bus, since it uses the
pm_generic_runtime_suspend|resume functions as runtime PM callbacks.

Cc: Kevin Hilman <khilman@...aro.org>
Cc: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/base/power/generic_ops.c |    4 ++--
 include/linux/pm_runtime.h       |   12 ++++++++----
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c
index 5ee030a..a2e55bf 100644
--- a/drivers/base/power/generic_ops.c
+++ b/drivers/base/power/generic_ops.c
@@ -10,7 +10,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/export.h>
 
-#ifdef CONFIG_PM_RUNTIME
+#ifdef CONFIG_PM
 /**
  * pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
  * @dev: Device to suspend.
@@ -48,7 +48,7 @@ int pm_generic_runtime_resume(struct device *dev)
 	return ret;
 }
 EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
-#endif /* CONFIG_PM_RUNTIME */
+#endif /* CONFIG_PM */
 
 #ifdef CONFIG_PM_SLEEP
 /**
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 6fa7cea..16c9a62 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -23,6 +23,14 @@
 					    usage_count */
 #define RPM_AUTO		0x08	/* Use autosuspend_delay */
 
+#ifdef CONFIG_PM
+extern int pm_generic_runtime_suspend(struct device *dev);
+extern int pm_generic_runtime_resume(struct device *dev);
+#else
+static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
+static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
+#endif
+
 #ifdef CONFIG_PM_RUNTIME
 
 extern struct workqueue_struct *pm_wq;
@@ -37,8 +45,6 @@ extern void pm_runtime_enable(struct device *dev);
 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
 extern void pm_runtime_allow(struct device *dev);
 extern void pm_runtime_forbid(struct device *dev);
-extern int pm_generic_runtime_suspend(struct device *dev);
-extern int pm_generic_runtime_resume(struct device *dev);
 extern void pm_runtime_no_callbacks(struct device *dev);
 extern void pm_runtime_irq_safe(struct device *dev);
 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
@@ -142,8 +148,6 @@ static inline bool pm_runtime_active(struct device *dev) { return true; }
 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
 
-static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
-static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
 static inline void pm_runtime_no_callbacks(struct device *dev) {}
 static inline void pm_runtime_irq_safe(struct device *dev) {}
 
-- 
1.7.9.5

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