This IOMMU driver doesn't support default domain. Add the implementation
of set_platform_dma_ops callback so that the IOMMU core could return the
DMA control. With the set_platform_dma_ops implemented, there's no need
for detach_dev. Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/mtk_iommu_v1.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 69682ee068d2..78d0a84c704f 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -319,7 +319,7 @@ static int mtk_iommu_v1_attach_device(struct iommu_domain *domain, struct device
 	return 0;
 }
 
-static void mtk_iommu_v1_detach_device(struct iommu_domain *domain, struct device *dev)
+static void mtk_iommu_v1_set_platform_dma(struct device *dev)
 {
 	struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
 
@@ -585,10 +585,10 @@ static const struct iommu_ops mtk_iommu_v1_ops = {
 	.def_domain_type = mtk_iommu_v1_def_domain_type,
 	.device_group	= generic_device_group,
 	.pgsize_bitmap	= MT2701_IOMMU_PAGE_SIZE,
+	.set_platform_dma_ops = mtk_iommu_v1_set_platform_dma,
 	.owner          = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= mtk_iommu_v1_attach_device,
-		.detach_dev	= mtk_iommu_v1_detach_device,
 		.map_pages	= mtk_iommu_v1_map,
 		.unmap_pages	= mtk_iommu_v1_unmap,
 		.iova_to_phys	= mtk_iommu_v1_iova_to_phys,
-- 
2.34.1

On Wed, Jan 04, 2023 at 08:57:19PM +0800, Lu Baolu wrote:
> This IOMMU driver doesn't support default domain. Add the implementation
> of set_platform_dma_ops callback so that the IOMMU core could return the
> DMA control. With the set_platform_dma_ops implemented, there's no need
> for detach_dev. Remove it to avoid dead code.
> 
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
>  drivers/iommu/mtk_iommu_v1.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason