net: mediatek: setup proper state for disabled GMAC on the default

The current solution would setup fixed and force link of 1Gbps to the both
GMAC on the default. However, The GMAC should always be put to link down
state when the GMAC is disabled on certain target boards. Otherwise,
the driver possibly receives unexpected data from the floating hardware
connection through the unused GMAC. Although the driver had been added
certain protection in RX path to get rid of such kind of unexpected data
sent to the upper stack.

Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
index 54adfd96785846f9e60a2ded11ab96bc0c196c7e..fc67e35b253e4e59c12227c3e24da9c0f5bae311 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -1961,11 +1961,12 @@ static int mtk_hw_init(struct mtk_eth *eth)
        /* set GE2 TUNE */
        regmap_write(eth->pctl, GPIO_BIAS_CTRL, 0x0);
 
-       /* GE1, Force 1000M/FD, FC ON */
-       mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(0));
-
-       /* GE2, Force 1000M/FD, FC ON */
-       mtk_w32(eth, MAC_MCR_FIXED_LINK, MTK_MAC_MCR(1));
+       /* Set linkdown as the default for each GMAC. Its own MCR would be set
+        * up with the more appropriate value when mtk_phy_link_adjust call is
+        * being invoked.
+        */
+       for (i = 0; i < MTK_MAC_COUNT; i++)
+               mtk_w32(eth, 0, MTK_MAC_MCR(i));
 
        /* Indicates CDM to parse the MTK special tag from CPU
         * which also is working out for untag packets.