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Commit c03f007a authored by Kevin Hilman's avatar Kevin Hilman Committed by Rafael J. Wysocki
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OMAP: PM: omap_device: add system PM methods for PM domain handling 



In the omap_device PM domain callbacks, use omap_device idle/enable to
automatically manage device idle states during system suspend/resume.

If an omap_device has not already been runtime suspended, the
->suspend_noirq() method of the PM domain will use omap_device_idle()
to idle the HW after calling the driver's ->runtime_suspend()
callback.  Similarily, upon resume, if the device was suspended during
->suspend_noirq(), the ->resume_noirq() method of the PM domain will
use omap_device_enable() to enable the HW and then call the driver's
->runtime_resume() callback.

If a device has already been runtime suspended, the noirq methods of
the PM domain leave the device runtime suspended by default.

However, if a driver needs to runtime resume a device during suspend
(for example, to change its wakeup settings), it may do so using
pm_runtime_get* in it's ->suspend() callback.

Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 256a5435

arch/arm/plat-omap/include/plat/omap_device.h

+4 −0
Original line number Diff line number Diff line
@@ -44,6 +44,9 @@ extern struct device omap_device_parent; 
#define OMAP_DEVICE_STATE_IDLE		2

#define OMAP_DEVICE_STATE_SHUTDOWN	3



/* omap_device.flags values */

#define OMAP_DEVICE_SUSPENDED BIT(0)



/**

 * struct omap_device - omap_device wrapper for platform_devices

 * @pdev: platform_device
@@ -73,6 +76,7 @@ struct omap_device { 
	s8				pm_lat_level;

	u8				hwmods_cnt;

	u8				_state;

	u8                              flags;

};



/* Device driver interface (call via platform_data fn ptrs) */

arch/arm/plat-omap/omap_device.c

+36 −0
Original line number Diff line number Diff line
@@ -566,11 +566,47 @@ static int _od_runtime_resume(struct device *dev) 
}

#endif



#ifdef CONFIG_SUSPEND

static int _od_suspend_noirq(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct omap_device *od = to_omap_device(pdev);

	int ret;



	ret = pm_generic_suspend_noirq(dev);



	if (!ret && !pm_runtime_status_suspended(dev)) {

		if (pm_generic_runtime_suspend(dev) == 0) {

			omap_device_idle(pdev);

			od->flags |= OMAP_DEVICE_SUSPENDED;

		}

	}



	return ret;

}



static int _od_resume_noirq(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);

	struct omap_device *od = to_omap_device(pdev);



	if ((od->flags & OMAP_DEVICE_SUSPENDED) &&

	    !pm_runtime_status_suspended(dev)) {

		od->flags &= ~OMAP_DEVICE_SUSPENDED;

		omap_device_enable(pdev);

		pm_generic_runtime_resume(dev);

	}



	return pm_generic_resume_noirq(dev);

}

#endif



static struct dev_pm_domain omap_device_pm_domain = {

	.ops = {

		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,

				   _od_runtime_idle)

		USE_PLATFORM_PM_SLEEP_OPS

		SET_SYSTEM_SLEEP_PM_OPS(_od_suspend_noirq, _od_resume_noirq)

	}

};