From 622015e407b0824805bb07416b8d9cdfbdc00182 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 19 May 2015 15:20:35 +0200 Subject: [PATCH] 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: Marek Szyprowski Tested-by: Javier Martinez Canillas Signed-off-by: Joerg Roedel --- drivers/iommu/exynos-iommu.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index c65826847819..5d2033b5a5b3 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -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, } }; -- 2.34.1