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Commit 622015e4 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Joerg Roedel
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iommu/exynos: Add system suspend/resume support 



When system goes into suspend state, iommu should save it's state and
restore after system resume. This is handled by 'late' pm ops to ensure
that sysmmu will be suspended after its master devices and restored
before them.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Tested-by: default avatarJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent ce70ca56

drivers/iommu/exynos-iommu.c

+31 −0
Original line number Diff line number Diff line
@@ -601,6 +601,36 @@ static int __init exynos_sysmmu_probe(struct platform_device *pdev) 
	return 0;

}



#ifdef CONFIG_PM_SLEEP

static int exynos_sysmmu_suspend(struct device *dev)

{

	struct sysmmu_drvdata *data = dev_get_drvdata(dev);



	dev_dbg(dev, "suspend\n");

	if (is_sysmmu_active(data)) {

		__sysmmu_disable_nocount(data);

		pm_runtime_put(dev);

	}

	return 0;

}



static int exynos_sysmmu_resume(struct device *dev)

{

	struct sysmmu_drvdata *data = dev_get_drvdata(dev);



	dev_dbg(dev, "resume\n");

	if (is_sysmmu_active(data)) {

		pm_runtime_get_sync(dev);

		__sysmmu_enable_nocount(data);

	}

	return 0;

}

#endif



static const struct dev_pm_ops sysmmu_pm_ops = {

	SET_LATE_SYSTEM_SLEEP_PM_OPS(exynos_sysmmu_suspend, exynos_sysmmu_resume)

};



static const struct of_device_id sysmmu_of_match[] __initconst = {

	{ .compatible	= "samsung,exynos-sysmmu", },

	{ },
@@ -611,6 +641,7 @@ static struct platform_driver exynos_sysmmu_driver __refdata = { 
	.driver	= {

		.name		= "exynos-sysmmu",

		.of_match_table	= sysmmu_of_match,

		.pm		= &sysmmu_pm_ops,

	}

};