linux-kernel - [PATCH 4.9 059/172] ARM64: dts: meson-gxbb-odroidc2: fix GbE tx link breakage

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Date:   Mon,  3 Jul 2017 15:33:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jerome Brunet <jbrunet@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Arnd Bergmann <arnd@...db.de>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 059/172] ARM64: dts: meson-gxbb-odroidc2: fix GbE tx link breakage

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jerome Brunet <jbrunet@...libre.com>


[ Upstream commit feb3cbea0946c67060e2d5bcb7499b0a6f6700fe ]

OdroidC2 GbE link breaks under heavy tx transfer. This happens even if the
MAC does not enable Energy Efficient Ethernet (No Low Power state Idle on
the Tx path). The problem seems to come from the phy Rx path, entering the
LPI state.

Disabling EEE advertisement on the phy prevent this feature to be
negociated with the link partner and solve the issue.

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
Signed-off-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-odroidc2.dts
@@ -85,6 +85,18 @@
 	status = "okay";
 	pinctrl-0 = <&eth_pins>;
 	pinctrl-names = "default";
+	phy-handle = <&eth_phy0>;
+
+	mdio {
+		compatible = "snps,dwmac-mdio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		eth_phy0: ethernet-phy@0 {
+			reg = <0>;
+			eee-broken-1000t;
+		};
+	};
 };
 
 &ir {