--- zzzz-none-000/linux-4.4.60/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c	2017-04-08 07:53:53.000000000 +0000
+++ scorpion-7490-727/linux-4.4.60/drivers/net/ethernet/stmicro/stmmac/dwmac-ipq806x.c	2021-02-04 17:41:59.000000000 +0000
@@ -259,6 +259,7 @@
 {
 	struct plat_stmmacenet_data *plat_dat;
 	struct stmmac_resources stmmac_res;
+	struct stmmac_dma_cfg *dma_cfg;
 	struct device *dev = &pdev->dev;
 	struct ipq806x_gmac *gmac;
 	int val;
@@ -348,6 +349,17 @@
 	plat_dat->bsp_priv = gmac;
 	plat_dat->fix_mac_speed = ipq806x_gmac_fix_mac_speed;
 
+	dma_cfg = devm_kzalloc(&pdev->dev, sizeof(*dma_cfg),
+			       GFP_KERNEL);
+
+	dma_cfg->pbl = 32;
+	dma_cfg->aal = 1;
+	dma_cfg->burst_len = DMA_AXI_BLEN_16 |
+		(7 << DMA_AXI_RD_OSR_LMT_SHIFT) |
+		(7 << DMA_AXI_WR_OSR_LMT_SHIFT);
+
+	plat_dat->dma_cfg = dma_cfg;
+
 	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
 }