linux-kernel - [PATCH] arm64: dts: rockchip: increase gmac rx

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Message-Id: <20241202090408.201662-1-jakob.unterwurzacher@cherry.de>
Date: Mon,  2 Dec 2024 10:04:07 +0100
From: Jakob Unterwurzacher <jakobunt@...il.com>
To: Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Quentin Schulz <quentin.schulz@...rry.de>,
	Sasha Levin <sashal@...nel.org>,
	Iskander Amara <iskander.amara@...obroma-systems.com>,
	Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>,
	Vahe Grigoryan <vahe.grigoryan@...obroma-systems.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: increase gmac rx_delay to 0x11 on rk3399-puma

During mass manufacturing, we noticed the mmc_rx_crc_error counter,
as reported by "ethtool -S eth0 | grep mmc_rx_crc_error" to increase
above zero during nuttcp speedtests.

Cycling through the rx_delay range on two boards shows that is a large
"good" region from 0x11 to 0x35 (see below for details).

This commit increases rx_delay to 0x11, which is the smallest
possible change that fixes the issue we are seeing on the KSZ9031 PHY.
This also matches what most other rk3399 boards do.

Tests for Puma PCBA S/N TT0069903:

	rx_delay mmc_rx_crc_error
	-------- ----------------
	0x09 (dhcp broken)
	0x10 897
	0x11 0
	0x20 0
	0x30 0
	0x35 0
	0x3a 745
	0x3b 11375
	0x3c 36680
	0x40 (dhcp broken)
	0x7f (dhcp broken)

Tests for Puma PCBA S/N TT0157733:

	rx_delay mmc_rx_crc_error
	-------- ----------------
	0x10 59
	0x11 0
	0x35 0

Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>
---
 arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
index 9efcdce0f593..13d0c511046b 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi
@@ -181,7 +181,7 @@ &gmac {
 	snps,reset-active-low;
 	snps,reset-delays-us = <0 10000 50000>;
 	tx_delay = <0x10>;
-	rx_delay = <0x10>;
+	rx_delay = <0x11>;
 	status = "okay";
 };
 
-- 
2.39.5