diff --git a/sys/arm64/arm64/busdma_bounce.c b/sys/arm64/arm64/busdma_bounce.c
--- a/sys/arm64/arm64/busdma_bounce.c
+++ b/sys/arm64/arm64/busdma_bounce.c
@@ -66,7 +66,6 @@
 	BF_KMEM_ALLOC_PAGES	= 0x04,
 	BF_KMEM_ALLOC_CONTIG	= 0x08,
 	BF_KMEM_ALLOC		= BF_KMEM_ALLOC_PAGES | BF_KMEM_ALLOC_CONTIG,
-	BF_COHERENT		= 0x10,
 };
 
 struct bounce_page;
@@ -188,7 +187,7 @@
 
 #define	DMAMAP_CACHELINE_FLAGS						\
     (DMAMAP_FROM_DMAMEM | DMAMAP_COHERENT | DMAMAP_MBUF)
-	if ((dmat->bounce_flags & BF_COHERENT) != 0)
+	if ((dmat->common.flags & BUS_DMA_COHERENT) != 0)
 		return (false);
 	if (map != NULL && (map->flags & DMAMAP_CACHELINE_FLAGS) != 0)
 		return (false);
@@ -266,19 +265,12 @@
 	newtag->map_count = 0;
 	newtag->segments = NULL;
 
-	if ((flags & BUS_DMA_COHERENT) != 0) {
-		newtag->bounce_flags |= BF_COHERENT;
-	}
-
 	if (parent != NULL) {
 		if ((parent->bounce_flags & BF_COULD_BOUNCE) != 0)
 			newtag->bounce_flags |= BF_COULD_BOUNCE;
-
-		/* Copy some flags from the parent */
-		newtag->bounce_flags |= parent->bounce_flags & BF_COHERENT;
 	}
 
-	if ((newtag->bounce_flags & BF_COHERENT) != 0) {
+	if ((newtag->common.flags & BUS_DMA_COHERENT) != 0) {
 		newtag->alloc_alignment = newtag->common.alignment;
 		newtag->alloc_size = newtag->common.maxsize;
 	} else {
@@ -449,7 +441,7 @@
 
 	if (error == 0) {
 		dmat->map_count++;
-		if ((dmat->bounce_flags & BF_COHERENT) != 0)
+		if ((dmat->common.flags & BUS_DMA_COHERENT) != 0)
 			(*mapp)->flags |= DMAMAP_COHERENT;
 	} else {
 		free(*mapp, M_DEVBUF);
@@ -515,7 +507,7 @@
 	if (flags & BUS_DMA_NOCACHE)
 		attr = VM_MEMATTR_UNCACHEABLE;
 	else if ((flags & BUS_DMA_COHERENT) != 0 &&
-	    (dmat->bounce_flags & BF_COHERENT) == 0)
+	    (dmat->common.flags & BUS_DMA_COHERENT) == 0)
 		/*
 		 * If we have a non-coherent tag, and are trying to allocate
 		 * a coherent block of memory it needs to be uncached.
@@ -540,7 +532,7 @@
 	 * tag was already marked as coherent.
 	 */
 	if (attr == VM_MEMATTR_UNCACHEABLE ||
-	    (dmat->bounce_flags & BF_COHERENT) != 0)
+	    (dmat->common.flags & BUS_DMA_COHERENT) != 0)
 		(*mapp)->flags |= DMAMAP_COHERENT;
 
 	(*mapp)->flags |= DMAMAP_FROM_DMAMEM;
diff --git a/sys/arm64/arm64/busdma_machdep.c b/sys/arm64/arm64/busdma_machdep.c
--- a/sys/arm64/arm64/busdma_machdep.c
+++ b/sys/arm64/arm64/busdma_machdep.c
@@ -85,6 +85,10 @@
 	common->nsegments = nsegments;
 	common->maxsegsz = maxsegsz;
 	common->flags = flags;
+	/* Copy the coherent flags from the parent */
+	if (parent != NULL)
+		common->flags |= parent->flags & BUS_DMA_COHERENT;
+
 	if (lockfunc != NULL) {
 		common->lockfunc = lockfunc;
 		common->lockfuncarg = lockfuncarg;