[PATCH 4.9 019/102] net: ethernet: mediatek: Use NET_IP_ALIGN to judge if HW RX_2BYTE_OFFSET is enabled

[Greg Kroah-Hartman]

[ Upstream commit 880c2d4b2fdfd580ebcd6bb7240a8027a1d34751 ]

Should only enable HW RX_2BYTE_OFFSET function in the case NET_IP_ALIGN
equals to 2.

Signed-off-by: Mark Lee <mark-mc.lee@xxxxxxxxxxxx>
Signed-off-by: Sean Wang <sean.wang@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 03b599109619..d10c8a8156bc 100644
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1700,6 +1700,7 @@ static void mtk_poll_controller(struct net_device *dev)
 
 static int mtk_start_dma(struct mtk_eth *eth)
 {
+	u32 rx_2b_offset = (NET_IP_ALIGN == 2) ? MTK_RX_2B_OFFSET : 0;
 	int err;
 
 	err = mtk_dma_init(eth);
@@ -1714,7 +1715,7 @@ static int mtk_start_dma(struct mtk_eth *eth)
 		MTK_QDMA_GLO_CFG);
 
 	mtk_w32(eth,
-		MTK_RX_DMA_EN | MTK_RX_2B_OFFSET |
+		MTK_RX_DMA_EN | rx_2b_offset |
 		MTK_RX_BT_32DWORDS | MTK_MULTI_EN,
 		MTK_PDMA_GLO_CFG);
 
-- 
2.20.1