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Commit e19f0d6b authored by Sujit Reddy Thumma's avatar Sujit Reddy Thumma Committed by Stephen Boyd
Browse files

ata: ahci_platform: Enable runtime power management 



Provide runtime power management callbacks for AHCI device.
The runtime power management will be disabled by default
due to regressions in hot plug functionality, but userspace
can enable it by echo'ing into following sysfs entry:

echo auto > /sys/devices/platform/ahci.X/power/control

Change-Id: I8421fc1369b45eb76dd0773a512984fd4fee99b4
Signed-off-by: default avatarSujit Reddy Thumma <sthumma@codeaurora.org>
parent bd314dc5

drivers/ata/ahci_platform.c

+31 −2
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/platform_device.h>

#include <linux/libata.h>

#include <linux/ahci_platform.h>

#include <linux/pm_runtime.h>

#include "ahci.h"



static void ahci_host_stop(struct ata_host *host);
@@ -216,6 +217,14 @@ static int ahci_probe(struct platform_device *pdev) 
	if (rc)

		goto pdata_exit;



	rc = pm_runtime_set_active(dev);

	if (rc) {

		dev_warn(dev, "Unable to set runtime pm active err=%d\n", rc);

	} else {

		pm_runtime_enable(dev);

		pm_runtime_forbid(dev);

	}



	return 0;

pdata_exit:

	if (pdata && pdata->exit)
@@ -254,6 +263,9 @@ static int ahci_suspend(struct device *dev) 
	u32 ctl;

	int rc;



	if (pm_runtime_suspended(dev))

		return 0;



	if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {

		dev_err(dev, "firmware update required for suspend/resume\n");

		return -EIO;
@@ -282,7 +294,7 @@ static int ahci_suspend(struct device *dev) 
	return 0;

}



static int ahci_resume(struct device *dev)

static int ahci_resume_common(struct device *dev)

{

	struct ahci_platform_data *pdata = dev_get_platdata(dev);

	struct ata_host *host = dev_get_drvdata(dev);
@@ -321,9 +333,26 @@ disable_unprepare_clk: 


	return rc;

}



static int ahci_resume(struct device *dev)

{

	int rc;



	rc = ahci_resume_common(dev);

	if (!rc) {

		pm_runtime_disable(dev);

		pm_runtime_set_active(dev);

		pm_runtime_enable(dev);

	}



	return rc;

}

#endif



static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);

static const struct dev_pm_ops ahci_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(ahci_suspend, ahci_resume)

	SET_RUNTIME_PM_OPS(ahci_suspend, ahci_resume_common, NULL)

};



static const struct of_device_id ahci_of_match[] = {

	{ .compatible = "snps,spear-ahci", },