2 files changed, 27 insertions, 0 deletions

diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c
index 84d0418660bf..9377aafa8996 100644
--- a/drivers/media/platform/vsp1/vsp1_drm.c
+++ b/drivers/media/platform/vsp1/vsp1_drm.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/slab.h>
 
 #include <media/media-entity.h>
@@ -540,6 +541,29 @@ void vsp1_du_atomic_flush(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(vsp1_du_atomic_flush);
 
+int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt)
+{
+        struct vsp1_device *vsp1 = dev_get_drvdata(dev);
+
+        /*
+         * As all the buffers allocated by the DU driver are coherent, we can
+         * skip cache sync. This will need to be revisited when support for
+         * non-coherent buffers will be added to the DU driver.
+         */
+        return dma_map_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,
+                                DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
+}
+EXPORT_SYMBOL_GPL(vsp1_du_map_sg);
+
+void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt)
+{
+        struct vsp1_device *vsp1 = dev_get_drvdata(dev);
+
+        dma_unmap_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents,
+                           DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
+}
+EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);
+
 /* -----------------------------------------------------------------------------
  * Initialization
  */
diff --git a/include/media/vsp1.h b/include/media/vsp1.h
index c135c47b4641..c837383b2013 100644
--- a/include/media/vsp1.h
+++ b/include/media/vsp1.h
@@ -13,6 +13,7 @@
 #ifndef __MEDIA_VSP1_H__
 #define __MEDIA_VSP1_H__
 
+#include <linux/scatterlist.h>
 #include <linux/types.h>
 #include <linux/videodev2.h>
 
@@ -53,5 +54,7 @@ void vsp1_du_atomic_begin(struct device *dev);
 int vsp1_du_atomic_update(struct device *dev, unsigned int rpf,
                           const struct vsp1_du_atomic_config *cfg);
 void vsp1_du_atomic_flush(struct device *dev);
+int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt);
+void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt);
 
 #endif /* __MEDIA_VSP1_H__ */