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Commit 9160b7c7 authored by David Lin's avatar David Lin Committed by Greg Kroah-Hartman
Browse files

greybus: arche-platform: Power-off unipro subsystem upon suspend 



Switch off APBs/SVC/Switch in the suspend call notifier. Note that
this is an interim solution to enable fishfooding.

Testing done:
 - Passed QA sanity test on EVT1.5
 - Suspend current measured at ~70mW

Signed-off-by: default avatarDavid Lin <dtwlin@google.com>
Signed-off-by: default avatarVaibhav Hiremath <vaibhav.hiremath@linaro.org>
[vaibhav.hiremath@linaro.org: Updated commit description]
Tested-by: default avatarSandeep Patil <sspatil@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent 777471a4

drivers/staging/greybus/arche-platform.c

+35 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/pm.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/suspend.h>

#include <linux/time.h>

#include "arche_platform.h"
@@ -56,6 +57,7 @@ struct arche_platform_drvdata { 
	int wake_detect_irq;

	spinlock_t lock;

	unsigned long wake_detect_start;

	struct notifier_block pm_notifier;



	struct device *dev;

};
@@ -339,6 +341,31 @@ static ssize_t state_show(struct device *dev, 


static DEVICE_ATTR_RW(state);



static int arche_platform_pm_notifier(struct notifier_block *notifier,

				      unsigned long pm_event, void *unused)

{

	struct arche_platform_drvdata *arche_pdata =

		container_of(notifier, struct arche_platform_drvdata,

			     pm_notifier);



	switch (pm_event) {

	case PM_SUSPEND_PREPARE:

		if (arche_pdata->state != ARCHE_PLATFORM_STATE_ACTIVE)

			return NOTIFY_STOP;

		device_for_each_child(arche_pdata->dev, NULL, apb_poweroff);

		arche_platform_poweroff_seq(arche_pdata);

		break;

	case PM_POST_SUSPEND:

		arche_platform_coldboot_seq(arche_pdata);

		assert_wakedetect(arche_pdata);

		break;

	default:

		break;

	}



	return NOTIFY_DONE;

}



static int arche_platform_probe(struct platform_device *pdev)

{

	struct arche_platform_drvdata *arche_pdata;
@@ -474,6 +501,13 @@ static int arche_platform_probe(struct platform_device *pdev) 


	assert_wakedetect(arche_pdata);



	arche_pdata->pm_notifier.notifier_call = arche_platform_pm_notifier;

	ret = register_pm_notifier(&arche_pdata->pm_notifier);

	if (ret) {

		dev_err(dev, "failed to register pm notifier %d\n", ret);

		goto err_populate;

	}



	dev_info(dev, "Device registered successfully\n");

	return 0;
@@ -497,6 +531,7 @@ static int arche_platform_remove(struct platform_device *pdev) 
{

	struct arche_platform_drvdata *arche_pdata = platform_get_drvdata(pdev);



	unregister_pm_notifier(&arche_pdata->pm_notifier);

	device_remove_file(&pdev->dev, &dev_attr_state);

	device_for_each_child(&pdev->dev, NULL, arche_remove_child);

	arche_platform_poweroff_seq(arche_pdata);