linux-kernel - [PATCH] arm64: dts: allwinner: orangepi-zero-plus: fix PHY mode

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Date:   Wed, 17 Nov 2021 10:47:01 +0100
From:   Robert Marko <robert.marko@...tura.hr>
To:     robh+dt@...nel.org, mripard@...nel.org, wens@...e.org,
        jernej.skrabec@...il.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Robert Marko <robert.marko@...tura.hr>,
        Ron Goossens <rgoossens@...il.com>
Subject: [PATCH] arm64: dts: allwinner: orangepi-zero-plus: fix PHY mode

Orange Pi Zero Plus uses a Realtek RTL8211E RGMII Gigabit PHY, but its
currently set to plain RGMII mode meaning that it doesn't introduce
delays.

With this setup, TX packets are completely lost and changing the mode to
RGMII-ID so the PHY will add delays internally fixes the issue.

Tested-by: Ron Goossens <rgoossens@...il.com>
Signed-off-by: Robert Marko <robert.marko@...tura.hr>
---
 arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus.dts b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus.dts
index d13980ed7a79..7ec5ac850a0d 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h5-orangepi-zero-plus.dts
@@ -69,7 +69,7 @@ &emac {
 	pinctrl-0 = <&emac_rgmii_pins>;
 	phy-supply = <&reg_gmac_3v3>;
 	phy-handle = <&ext_rgmii_phy>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	status = "okay";
 };
 
-- 
2.33.1