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-gart.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index ed53279d1106..f56e40b5c47a 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -141,6 +141,14 @@ static void gart_iommu_detach_dev(struct iommu_domain *domain,
 	spin_unlock(&gart->dom_lock);
 }
 
+static void gart_iommu_set_platform_dma(struct device *dev)
+{
+	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+
+	if (domain)
+		gart_iommu_detach_dev(domain, dev);
+}
+
 static struct iommu_domain *gart_iommu_domain_alloc(unsigned type)
 {
 	struct iommu_domain *domain;
@@ -270,6 +278,7 @@ static const struct iommu_ops gart_iommu_ops = {
 	.domain_alloc	= gart_iommu_domain_alloc,
 	.probe_device	= gart_iommu_probe_device,
 	.device_group	= generic_device_group,
+	.set_platform_dma = gart_iommu_set_platform_dma,
 	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
 	.of_xlate	= gart_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
-- 
2.34.1