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

net: stmmac: enable EEE in MII, GMII or RGMII only

to the 4.14-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-stmmac-enable-eee-in-mii-gmii-or-rgmii-only.patch and it can be found in the queue-4.14 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 Sat Jan 13 10:51:05 CET 2018

From: Jerome Brunet jbrunet@baylibre.com Date: Wed, 3 Jan 2018 16:46:29 +0100 Subject: net: stmmac: enable EEE in MII, GMII or RGMII only

From: Jerome Brunet jbrunet@baylibre.com

[ Upstream commit 879626e3a52630316d817cbda7cec9a5446d1d82 ]

Note in the databook - Section 4.4 - EEE : " The EEE feature is not supported when the MAC is configured to use the TBI, RTBI, SMII, RMII or SGMII single PHY interface. Even if the MAC supports multiple PHY interfaces, you should activate the EEE mode only when the MAC is operating with GMII, MII, or RGMII interface."

Applying this restriction solves a stability issue observed on Amlogic gxl platforms operating with RMII interface and the internal PHY.

Fixes: 83bf79b6bb64 ("stmmac: disable at run-time the EEE if not supported") Signed-off-by: Jerome Brunet jbrunet@baylibre.com Tested-by: Arnaud Patard arnaud.patard@rtp-net.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++++++ 1 file changed, 6 insertions(+)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -364,9 +364,15 @@ static void stmmac_eee_ctrl_timer(unsign bool stmmac_eee_init(struct stmmac_priv *priv) { struct net_device *ndev = priv->dev; + int interface = priv->plat->interface; unsigned long flags; bool ret = false;

+ if ((interface != PHY_INTERFACE_MODE_MII) && + (interface != PHY_INTERFACE_MODE_GMII) && + !phy_interface_mode_is_rgmii(interface)) + goto out; + /* Using PCS we cannot dial with the phy registers at this stage * so we do not support extra feature like EEE. */

Patches currently in stable-queue which might be from jbrunet@baylibre.com are

queue-4.14/net-stmmac-enable-eee-in-mii-gmii-or-rgmii-only.patch