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Commit aece27a2 authored by Samuel Morris's avatar Samuel Morris Committed by Tejun Heo
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ata: ahci_platform: allow disabling of hotplug to save power 



A number of resources remain powered to support hotplug. On platforms
I've worked with, allowing the ahci_platform to suspend saves about
150mW. This patch enables rpm and allows the device to be auto-suspended
through sysfs.

Signed-off-by: default avatarSamuel Morris <samorris@lexmark.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 332c42a9

drivers/ata/ahci_platform.c

+9 −2
Original line number Diff line number Diff line
@@ -68,8 +68,13 @@ static int ahci_probe(struct platform_device *pdev) 
	return rc;

}



static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,

			 ahci_platform_resume);

#ifdef CONFIG_PM_SLEEP

static const struct dev_pm_ops ahci_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(ahci_platform_suspend, ahci_platform_resume)

	SET_RUNTIME_PM_OPS(ahci_platform_runtime_suspend,

			ahci_platform_runtime_resume, NULL)

};

#endif



static const struct of_device_id ahci_of_match[] = {

	{ .compatible = "generic-ahci", },
@@ -98,7 +103,9 @@ static struct platform_driver ahci_driver = { 
		.name = DRV_NAME,

		.of_match_table = ahci_of_match,

		.acpi_match_table = ahci_acpi_match,

#ifdef CONFIG_PM_SLEEP

		.pm = &ahci_pm_ops,

#endif

	},

};

module_platform_driver(ahci_driver);

drivers/ata/libahci_platform.c

+65 −17
Original line number Diff line number Diff line
@@ -257,7 +257,7 @@ static void ahci_platform_put_resources(struct device *dev, void *res) 
	int c;



	if (hpriv->got_runtime_pm) {

		pm_runtime_put_sync(dev);

		pm_runtime_allow(dev);

		pm_runtime_disable(dev);

	}
@@ -475,8 +475,10 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev) 
		if (rc == -EPROBE_DEFER)

			goto err_out;

	}



	pm_runtime_set_active(dev);

	pm_runtime_enable(dev);

	pm_runtime_get_sync(dev);

	pm_runtime_forbid(dev);

	hpriv->got_runtime_pm = true;



	devres_remove_group(dev, NULL);
@@ -705,6 +707,21 @@ int ahci_platform_resume_host(struct device *dev) 
}

EXPORT_SYMBOL_GPL(ahci_platform_resume_host);



static int _ahci_platform_suspend(struct device *dev)

{

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;

	int rc;



	rc = ahci_platform_suspend_host(dev);

	if (rc)

		return rc;



	ahci_platform_disable_resources(hpriv);



	return 0;

}



/**

 * ahci_platform_suspend - Suspend an ahci-platform device

 * @dev: the platform device to suspend
@@ -716,20 +733,45 @@ EXPORT_SYMBOL_GPL(ahci_platform_resume_host); 
 * 0 on success otherwise a negative error code

 */

int ahci_platform_suspend(struct device *dev)

{

	return _ahci_platform_suspend(dev);

}

EXPORT_SYMBOL_GPL(ahci_platform_suspend);



/**

 * ahci_platform_runtime_suspend - Runtime suspend an ahci-platform device

 * @dev: the platform device to suspend

 *

 * This function suspends the host associated with the device, followed by

 * disabling all the resources of the device.

 *

 * RETURNS:

 * 0 on success otherwise a negative error code

 */

int ahci_platform_runtime_suspend(struct device *dev)

{

	return _ahci_platform_suspend(dev);

}

EXPORT_SYMBOL_GPL(ahci_platform_runtime_suspend);



static int _ahci_platform_resume(struct device *dev)

{

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;

	int rc;



	rc = ahci_platform_suspend_host(dev);

	rc = ahci_platform_enable_resources(hpriv);

	if (rc)

		return rc;



	rc = ahci_platform_resume_host(dev);

	if (rc) {

		ahci_platform_disable_resources(hpriv);

		return rc;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(ahci_platform_suspend);



/**

 * ahci_platform_resume - Resume an ahci-platform device
@@ -743,31 +785,37 @@ EXPORT_SYMBOL_GPL(ahci_platform_suspend); 
 */

int ahci_platform_resume(struct device *dev)

{

	struct ata_host *host = dev_get_drvdata(dev);

	struct ahci_host_priv *hpriv = host->private_data;

	int rc;



	rc = ahci_platform_enable_resources(hpriv);

	rc = _ahci_platform_resume(dev);

	if (rc)

		return rc;



	rc = ahci_platform_resume_host(dev);

	if (rc)

		goto disable_resources;



	/* We resumed so update PM runtime state */

	pm_runtime_disable(dev);

	pm_runtime_set_active(dev);

	pm_runtime_enable(dev);



	return 0;



disable_resources:

	ahci_platform_disable_resources(hpriv);



	return rc;

}

EXPORT_SYMBOL_GPL(ahci_platform_resume);



/**

 * ahci_platform_runtime_resume - Runtime resume an ahci-platform device

 * @dev: the platform device to resume

 *

 * This function enables all the resources of the device followed by

 * resuming the host associated with the device.

 *

 * RETURNS:

 * 0 on success otherwise a negative error code

 */

int ahci_platform_runtime_resume(struct device *dev)

{

	return _ahci_platform_resume(dev);

}

EXPORT_SYMBOL_GPL(ahci_platform_runtime_resume);



#endif



MODULE_DESCRIPTION("AHCI SATA platform library");

include/linux/ahci_platform.h

+2 −0
Original line number Diff line number Diff line
@@ -42,5 +42,7 @@ int ahci_platform_suspend_host(struct device *dev); 
int ahci_platform_resume_host(struct device *dev);

int ahci_platform_suspend(struct device *dev);

int ahci_platform_resume(struct device *dev);

int ahci_platform_runtime_suspend(struct device *dev);

int ahci_platform_runtime_resume(struct device *dev);



#endif /* _AHCI_PLATFORM_H */