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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>
hifive-unleashed-5.1
Robin Murphy 2017-08-08 14:56:15 +01:00 committed by Will Deacon
parent 90df373cc6
commit a2d866f7d6
1 changed files with 11 additions and 0 deletions
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11
drivers/iommu/arm-smmu.c
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@ -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,