Respect device driver requirement for device DMA not to be implicitly
backed with IOMMU by skipping the backing setup for drivers that do not
want that.
Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
drivers/of/device.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 33d85511d790..e70b7a886875 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -163,6 +163,13 @@ int of_dma_configure(struct device *dev, struct
device_node *np, bool force_dma)
dev_dbg(dev, "device is%sbehind an iommu\n",
iommu ? " " : " not ");
+ /*
+ * Respect device driver requirement for device DMA not to be
+ * implicitly backed with IOMMU.
+ */
+ if (iommu && dev->driver->no_implicit_iommu)
+ iommu = NULL;
+
arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
return 0;
--
2.18.0
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