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

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[ Upstream commit 7352e252b5 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Wang
2017-12-18 17:00:17 +08:00
committed by Greg Kroah-Hartman
parent 1ec97b2a44
commit 757677d0da
1 changed files with 6 additions and 5 deletions
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11
drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -1842,11 +1842,12 @@ 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));
/* Enable RX VLan Offloading */
mtk_w32(eth, 1, MTK_CDMP_EG_CTRL);