This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma callback so that the IOMMU core could return the
DMA control.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/tegra-smmu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 5b1af40221ec..a36e163e5cc1 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -527,6 +527,14 @@ static void tegra_smmu_detach_dev(struct iommu_domain *domain, struct device *de
 	}
 }
 
+static void tegra_smmu_set_platform_dma(struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+	if (domain)
+		tegra_smmu_detach_dev(domain, dev);
+}
+
 static void tegra_smmu_set_pde(struct tegra_smmu_as *as, unsigned long iova,
 			       u32 value)
 {
@@ -965,6 +973,7 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.domain_alloc = tegra_smmu_domain_alloc,
 	.probe_device = tegra_smmu_probe_device,
 	.device_group = tegra_smmu_device_group,
+	.set_platform_dma = tegra_smmu_set_platform_dma,
 	.of_xlate = tegra_smmu_of_xlate,
 	.pgsize_bitmap = SZ_4K,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-- 
2.34.1