--- zzzz-none-000/linux-4.1.38/lib/swiotlb.c	2017-01-18 18:48:06.000000000 +0000
+++ bcm63-7582-715/linux-4.1.38/lib/swiotlb.c	2020-11-25 10:06:48.000000000 +0000
@@ -215,6 +215,12 @@
 	unsigned char *vstart;
 	unsigned long bytes;
 
+#if defined CONFIG_BCM_KF_ARM64_BCM963XX
+#if defined CONFIG_ARM64
+	if(!swiotlb_force && (max_pfn <= (arm64_dma_phys_limit >> PAGE_SHIFT)))
+		return;
+#endif
+#endif
 	if (!io_tlb_nslabs) {
 		io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
 		io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
@@ -990,6 +996,12 @@
 int
 swiotlb_dma_supported(struct device *hwdev, u64 mask)
 {
+#if defined CONFIG_BCM_KF_ARM64_BCM963XX
+#if defined CONFIG_ARM64
+	if(!swiotlb_force && (max_pfn <= (arm64_dma_phys_limit >> PAGE_SHIFT)))
+		return 1;
+#endif
+#endif
 	return phys_to_dma(hwdev, io_tlb_end - 1) <= mask;
 }
 EXPORT_SYMBOL(swiotlb_dma_supported);