This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: net-mediatek-setup-proper-state-for-disabled-gmac-on-the-default.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Feb 28 16:13:29 CET 2018

From: Sean Wang sean.wang@mediatek.com Date: Mon, 18 Dec 2017 17:00:17 +0800 Subject: net: mediatek: setup proper state for disabled GMAC on the default

From: Sean Wang sean.wang@mediatek.com

[ Upstream commit 7352e252b5bf40d59342494a70354a2d436fd0cd ]

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 --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -1842,11 +1842,12 @@ static int mtk_hw_init(struct mtk_eth *e /* 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);

Patches currently in stable-queue which might be from sean.wang@mediatek.com are

queue-4.9/net-mediatek-setup-proper-state-for-disabled-gmac-on-the-default.patch