Do not sync to device, looks like it is not required

dma/nwl_engine.c

@@ -292,7 +292,8 @@ int dma_nwl_stream_read(pcilib_dma_context_t *vctx, pcilib_dma_engine_t dma, uin
 	pcilib_kmem_sync_block(ctx->pcilib, info->pages, PCILIB_KMEM_SYNC_FROMDEVICE, bufnum);
         void *buf = pcilib_kmem_get_block_ua(ctx->pcilib, info->pages, bufnum);
 	ret = cb(cbattr, eop?PCILIB_DMA_FLAG_EOP:0, bufsize, buf);
-	pcilib_kmem_sync_block(ctx->pcilib, info->pages, PCILIB_KMEM_SYNC_TODEVICE, bufnum);
+//	DS: Fixme, it looks like we can avoid calling this for the sake of performance
+//	pcilib_kmem_sync_block(ctx->pcilib, info->pages, PCILIB_KMEM_SYNC_TODEVICE, bufnum);
 	dma_nwl_return_buffer(ctx, info);