* [PATCH] arm64: dts: allwinner: sun50i-a64-olinuxino: Add RX delay
@ 2026-08-15 0:53 Roman Riabenko
2026-08-16 18:59 ` Jernej Škrabec
0 siblings, 1 reply; 2+ messages in thread
From: Roman Riabenko @ 2026-08-15 0:53 UTC (permalink / raw)
To: wens, jernej.skrabec, samuel
Cc: andre.przywara, robh, krzk+dt, conor+dt, devicetree,
linux-arm-kernel, linux-sunxi, Roman Riabenko
The Ethernet on Olimex A64-OlinuXino computers requires an RX delay
greater than 0. If the value is not set or is 0, packet loss in the
downlink direction is severe enough to interfere with downloads and
disrupt software installation.
The range of acceptable values is wide. The vendor has been applying
200 ps in its downstream DTs since 2021. This patch matches that
common practice.
Signed-off-by: Roman Riabenko <roman@riabenko.com>
---
arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
index fd3794678c33..6c8b79c257b9 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-olinuxino.dts
@@ -106,6 +106,7 @@ &emac {
phy-handle = <&ext_rgmii_phy>;
phy-supply = <®_dcdc1>;
allwinner,tx-delay-ps = <600>;
+ allwinner,rx-delay-ps = <200>;
status = "okay";
};
--
2.54.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] arm64: dts: allwinner: sun50i-a64-olinuxino: Add RX delay
2026-08-15 0:53 [PATCH] arm64: dts: allwinner: sun50i-a64-olinuxino: Add RX delay Roman Riabenko
@ 2026-08-16 18:59 ` Jernej Škrabec
0 siblings, 0 replies; 2+ messages in thread
From: Jernej Škrabec @ 2026-08-16 18:59 UTC (permalink / raw)
To: wens, samuel, Roman Riabenko
Cc: andre.przywara, robh, krzk+dt, conor+dt, devicetree,
linux-arm-kernel, linux-sunxi, Roman Riabenko
Dne sobota, 15. avgust 2026 ob 02:53:16 Srednjeevropski poletni čas je Roman Riabenko napisal(a):
> The Ethernet on Olimex A64-OlinuXino computers requires an RX delay
> greater than 0. If the value is not set or is 0, packet loss in the
> downlink direction is severe enough to interfere with downloads and
> disrupt software installation.
>
> The range of acceptable values is wide. The vendor has been applying
> 200 ps in its downstream DTs since 2021. This patch matches that
> common practice.
>
> Signed-off-by: Roman Riabenko <roman@riabenko.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Best regards,
Jernej
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-08-15 0:53 [PATCH] arm64: dts: allwinner: sun50i-a64-olinuxino: Add RX delay Roman Riabenko
2026-08-16 18:59 ` Jernej Škrabec
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