linux-kernel - [PATCH v3 5/5] arm64: dts: meson: g12b: w400: fix PHY deassert timing requirements

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Message-Id: <46298e66572784c44f873f1b71cc4ab3d8fc5aa6.1607363522.git.stefan@agner.ch>
Date:   Mon,  7 Dec 2020 18:58:03 +0100
From:   Stefan Agner <stefan@...er.ch>
To:     khilman@...libre.com
Cc:     robh+dt@...nel.org, narmstrong@...libre.com, jbrunet@...libre.com,
        martin.blumenstingl@...glemail.com, christianshewitt@...il.com,
        jian.hu@...ogic.com, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Agner <stefan@...er.ch>
Subject: [PATCH v3 5/5] arm64: dts: meson: g12b: w400: fix PHY deassert timing requirements

According to the datasheet (Rev. 1.9) the RTL8211F requires at least
72ms "for internal circuits settling time" before accessing the PHY
egisters. On similar boards with the same PHY this fixes an issue where
Ethernet link would not come up when using ip link set down/up.

Fixes: 2cd2310fca4c ("arm64: dts: meson-g12b-ugoos-am6: add initial device-tree")
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi b/arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi
index 2802ddbb83ac..feb088504740 100644
--- a/arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b-w400.dtsi
@@ -264,7 +264,7 @@ external_phy: ethernet-phy@0 {
 		max-speed = <1000>;
 
 		reset-assert-us = <10000>;
-		reset-deassert-us = <30000>;
+		reset-deassert-us = <80000>;
 		reset-gpios = <&gpio GPIOZ_15 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;
 
 		interrupt-parent = <&gpio_intc>;
-- 
2.29.2