Commit 45f0a85c authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

PM / Runtime: Rework the "runtime idle" helper routine 



The "runtime idle" helper routine, rpm_idle(), currently ignores
return values from .runtime_idle() callbacks executed by it.
However, it turns out that many subsystems use
pm_generic_runtime_idle() which checks the return value of the
driver's callback and executes pm_runtime_suspend() for the device
unless that value is not 0.  If that logic is moved to rpm_idle()
instead, pm_generic_runtime_idle() can be dropped and its users
will not need any .runtime_idle() callbacks any more.

Moreover, the PCI, SCSI, and SATA subsystems' .runtime_idle()
routines, pci_pm_runtime_idle(), scsi_runtime_idle(), and
ata_port_runtime_idle(), respectively, as well as a few drivers'
ones may be simplified if rpm_idle() calls rpm_suspend() after 0 has
been returned by the .runtime_idle() callback executed by it.

To reduce overall code bloat, make the changes described above.

Tested-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: default avatarKevin Hilman <khilman@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: default avatarKevin Hilman <khilman@linaro.org>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
parent cd38ca85

Documentation/power/runtime_pm.txt

+0 −5
Original line number Diff line number Diff line
@@ -660,11 +660,6 @@ Subsystems may wish to conserve code space by using the set of generic power 
management callbacks provided by the PM core, defined in

driver/base/power/generic_ops.c:



  int pm_generic_runtime_idle(struct device *dev);

    - invoke the ->runtime_idle() callback provided by the driver of this

      device, if defined, and call pm_runtime_suspend() for this device if the

      return value is 0 or the callback is not defined



  int pm_generic_runtime_suspend(struct device *dev);

    - invoke the ->runtime_suspend() callback provided by the driver of this

      device and return its result, or return -EINVAL if not defined

arch/arm/mach-omap2/omap_device.c

+1 −6
Original line number Diff line number Diff line
@@ -591,11 +591,6 @@ static int _od_runtime_suspend(struct device *dev) 
	return ret;

}



static int _od_runtime_idle(struct device *dev)

{

	return pm_generic_runtime_idle(dev);

}



static int _od_runtime_resume(struct device *dev)

{

	struct platform_device *pdev = to_platform_device(dev);
@@ -653,7 +648,7 @@ static int _od_resume_noirq(struct device *dev) 
struct dev_pm_domain omap_device_pm_domain = {

	.ops = {

		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,

				   _od_runtime_idle)

				   NULL)

		USE_PLATFORM_PM_SLEEP_OPS

		.suspend_noirq = _od_suspend_noirq,

		.resume_noirq = _od_resume_noirq,

drivers/acpi/device_pm.c

+0 −1
Original line number Diff line number Diff line
@@ -886,7 +886,6 @@ static struct dev_pm_domain acpi_general_pm_domain = { 
#ifdef CONFIG_PM_RUNTIME

		.runtime_suspend = acpi_subsys_runtime_suspend,

		.runtime_resume = acpi_subsys_runtime_resume,

		.runtime_idle = pm_generic_runtime_idle,

#endif

#ifdef CONFIG_PM_SLEEP

		.prepare = acpi_subsys_prepare,

drivers/amba/bus.c

+1 −1
Original line number Diff line number Diff line
@@ -284,7 +284,7 @@ static const struct dev_pm_ops amba_pm = { 
	SET_RUNTIME_PM_OPS(

		amba_pm_runtime_suspend,

		amba_pm_runtime_resume,

		pm_generic_runtime_idle

		NULL

	)

};

drivers/ata/libata-core.c

+1 −1
Original line number Diff line number Diff line
@@ -5430,7 +5430,7 @@ static int ata_port_runtime_idle(struct device *dev) 
				return -EBUSY;

	}



	return pm_runtime_suspend(dev);

	return 0;

}



static int ata_port_runtime_suspend(struct device *dev)

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