--- zzzz-none-000/linux-4.4.271/drivers/video/fbdev/core/fb_defio.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/video/fbdev/core/fb_defio.c	2023-04-19 10:22:30.000000000 +0000
@@ -170,6 +170,10 @@
 	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
 	if (!(info->flags & FBINFO_VIRTFB))
 		vma->vm_flags |= VM_IO;
+
+	if (info->flags & FBINFO_DMAFB)
+		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
 	vma->vm_private_data = info;
 	return 0;
 }