iommu/arm-smmu: Add system PM support

With all our hardware state tracked in such a way that we can naturally
restore it as part of the necessary reset, resuming is trivial, and
there's nothing to do on suspend at all.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 0a5fa12..445f0ea 100644 (file)
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -2372,10 +2372,21 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
        arm_smmu_device_remove(pdev);
 }
 
+static int __maybe_unused arm_smmu_pm_resume(struct device *dev)
+{
+       struct arm_smmu_device *smmu = dev_get_drvdata(dev);
+
+       arm_smmu_device_reset(smmu);
+       return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(arm_smmu_pm_ops, NULL, arm_smmu_pm_resume);
+
 static struct platform_driver arm_smmu_driver = {
        .driver = {
                .name           = "arm-smmu",
                .of_match_table = of_match_ptr(arm_smmu_of_match),
+               .pm             = &arm_smmu_pm_ops,
        },
        .probe  = arm_smmu_device_probe,
        .remove = arm_smmu_device_remove,