linux-kernel - [PATCH v4 1/4] PM / Runtime: Add getter for quering the IRQ safe option

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Message-id: <1410857494-15936-2-git-send-email-k.kozlowski@samsung.com>
Date:	Tue, 16 Sep 2014 10:51:31 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Russell King <linux@....linux.org.uk>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Michal Simek <michal.simek@...inx.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-doc@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>
Subject: [PATCH v4 1/4] PM / Runtime: Add getter for quering the IRQ safe option

Add a simple getter pm_runtime_is_irq_safe() for quering whether runtime
PM IRQ safe was set or not.

Various bus drivers implementing runtime PM may use choose to suspend
differently based on IRQ safeness status of child driver (e.g. do not
unprepare the clock if IRQ safe is not set).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
---
 Documentation/power/runtime_pm.txt | 4 ++++
 include/linux/pm_runtime.h         | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/power/runtime_pm.txt b/Documentation/power/runtime_pm.txt
index f32ce5419573..397b81593142 100644
--- a/Documentation/power/runtime_pm.txt
+++ b/Documentation/power/runtime_pm.txt
@@ -468,6 +468,10 @@ drivers/base/power/runtime.c and include/linux/pm_runtime.h:
     - set the power.irq_safe flag for the device, causing the runtime-PM
       callbacks to be invoked with interrupts off
 
+  bool pm_runtime_is_irq_safe(struct device *dev);
+    - return true if power.irq_safe flag was set for the device, causing
+      the runtime-PM callbacks to be invoked with interrupts off
+
   void pm_runtime_mark_last_busy(struct device *dev);
     - set the power.last_busy field to the current time
 
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 367f49b9a1c9..44d74f0f182e 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -128,6 +128,11 @@ static inline void pm_runtime_mark_last_busy(struct device *dev)
 	ACCESS_ONCE(dev->power.last_busy) = jiffies;
 }
 
+static inline bool pm_runtime_is_irq_safe(struct device *dev)
+{
+	return dev->power.irq_safe;
+}
+
 #else /* !CONFIG_PM_RUNTIME */
 
 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
@@ -167,6 +172,7 @@ static inline bool pm_runtime_enabled(struct device *dev) { return false; }
 
 static inline void pm_runtime_no_callbacks(struct device *dev) {}
 static inline void pm_runtime_irq_safe(struct device *dev) {}
+static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
 
 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }
 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
-- 
1.9.1

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