From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Vladimir Oltean <vladimir.oltean@nxp.com>,
Florian Fainelli <f.fainelli@gmail.com>,
Oleksij Rempel <o.rempel@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>, Sasha Levin <sashal@kernel.org>,
robh+dt@kernel.org, devicetree@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.15 01/29] ARM: dts: imx6qp-prtwd3: update RGMII delays for sja1105 switch
Date: Mon, 20 Dec 2021 20:57:22 -0500 [thread overview]
Message-ID: <20211221015751.116328-1-sashal@kernel.org> (raw)
From: Vladimir Oltean <vladimir.oltean@nxp.com>
[ Upstream commit f2c2e9ebb2cf476c09e59d073db031fbf7ef4914 ]
In the new behavior, the sja1105 driver expects there to be explicit
RGMII delays present on the fixed-link ports, otherwise it will complain
that it falls back to legacy behavior, which is to apply RGMII delays
incorrectly derived from the phy-mode string.
In this case, the legacy behavior of the driver is to apply both RX and
TX delays. To preserve that, add explicit 2 nanosecond delays, which are
identical with what the driver used to add (a 90 degree phase shift).
The delays from the phy-mode are ignored by new kernels (it's still
RGMII as long as it's "rgmii*" something), and the explicit
{rx,tx}-internal-delay-ps properties are ignored by old kernels, so the
change works both ways.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm/boot/dts/imx6qp-prtwd3.dts | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/boot/dts/imx6qp-prtwd3.dts b/arch/arm/boot/dts/imx6qp-prtwd3.dts
index b92e0f2748a51..29dd59bfa73dd 100644
--- a/arch/arm/boot/dts/imx6qp-prtwd3.dts
+++ b/arch/arm/boot/dts/imx6qp-prtwd3.dts
@@ -178,6 +178,8 @@ port@4 {
label = "cpu";
ethernet = <&fec>;
phy-mode = "rgmii-id";
+ rx-internal-delay-ps = <2000>;
+ tx-internal-delay-ps = <2000>;
fixed-link {
speed = <100>;
--
2.34.1
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next reply other threads:[~2021-12-21 1:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-21 1:57 Sasha Levin [this message]
2021-12-21 1:57 ` [PATCH AUTOSEL 5.15 02/29] ARM: dts: ls1021a-tsn: update RGMII delays for sja1105 switch Sasha Levin
2021-12-21 1:57 ` [PATCH AUTOSEL 5.15 03/29] ARM: rockchip: Use memcpy_toio instead of memcpy on smp bring-up Sasha Levin
2021-12-21 1:57 ` [PATCH AUTOSEL 5.15 05/29] mac80211: set up the fwd_skb->dev for mesh forwarding Sasha Levin
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