Hook into the platform bus methods for suspend and resume and use the
runtime PM API to allow the OMAP runtime PM core (based on
omap_device) to automatically idle and enable the device on suspend
and resume.
This allows device drivers to get rid of direct management of their
clocks in their suspend/resume paths, and let omap_device do it for
them .
We currently use the _noirq (late suspend, early resume) versions of
the suspend/resume methods to ensure that the device is not disabled
too early for any drivers also using the _noirq methods.
NOTE: only works for devices with omap_hwmod support.
Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-omap2/pm_bus.c | 48 ++++++++++++++++++++++++++++++++++++++++++
1 files changed, 48 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/pm_bus.c b/arch/arm/mach-omap2/pm_bus.c
index 9719a9f..5e453dc 100644
--- a/arch/arm/mach-omap2/pm_bus.c
+++ b/arch/arm/mach-omap2/pm_bus.c
@@ -68,3 +68,51 @@ int platform_pm_runtime_idle(struct device *dev)
};
#endif /* CONFIG_PM_RUNTIME */
+#ifdef CONFIG_SUSPEND
+int platform_pm_suspend_noirq(struct device *dev)
+{
+ struct device_driver *drv = dev->driver;
+ int ret = 0;
+
+ if (!drv)
+ return 0;
+
+ if (drv->pm) {
+ if (drv->pm->suspend_noirq)
+ ret = drv->pm->suspend_noirq(dev);
+ }
+
+ /*
+ * The DPM core has done a 'get' to prevent runtime PM
+ * transitions during system PM. This put is to balance
+ * out that get so that this device can now be runtime
+ * suspended.
+ */
+ pm_runtime_put_sync(dev);
+
+ return ret;
+}
+
+int platform_pm_resume_noirq(struct device *dev)
+{
+ struct device_driver *drv = dev->driver;
+ int ret = 0;
+
+ /*
+ * This 'get' is to balance the 'put' in the above suspend_noirq
+ * method so that the runtime PM usage counting is in the same
+ * state it was when suspend was called.
+ */
+ pm_runtime_get_sync(dev);
+
+ if (!drv)
+ return 0;
+
+ if (drv->pm) {
+ if (drv->pm->resume_noirq)
+ ret = drv->pm->resume_noirq(dev);
+ }
+
+ return ret;
+}
+#endif /* CONFIG_SUSPEND */
--
1.7.0.2
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