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ata: ahci_platform: allow disabling of hotplug to save power

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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: Samuel Morris <samorris@lexmark.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Samuel Morris
2018-05-29 10:06:12 +00:00
committed by Tejun Heo
parent 332c42a9ff
commit aece27a2f0
3 changed files with 84 additions and 27 deletions
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98
drivers/ata/libahci_platform.c
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@@ -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);
@@ -705,17 +707,7 @@ int ahci_platform_resume_host(struct device *dev)
}
EXPORT_SYMBOL_GPL(ahci_platform_resume_host);
/**
* ahci_platform_suspend - 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_suspend(struct device *dev)
static int _ahci_platform_suspend(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct ahci_host_priv *hpriv = host->private_data;
@@ -729,8 +721,58 @@ int ahci_platform_suspend(struct device *dev)
return 0;
}
/**
* ahci_platform_suspend - 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_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_enable_resources(hpriv);
if (rc)
return rc;
rc = ahci_platform_resume_host(dev);
if (rc) {
ahci_platform_disable_resources(hpriv);
return rc;
}
return 0;
}
/**
* ahci_platform_resume - Resume an ahci-platform device
* @dev: the platform device to resume
@@ -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");