From: Evgeniy Didin <Evgeniy.Didin@synopsys.com>
Date: Tue, 7 Jul 2020 15:38:58 +0000 (+0300)
Subject: ARC: [plat-hsdk]: Switch ethernet phy-mode to rgmii-id
X-Git-Tag: v4.19.146~48
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=099df531a4ca2a411522131090c65add2b35316d;p=users%2Fdwmw2%2Flinux.git

ARC: [plat-hsdk]: Switch ethernet phy-mode to rgmii-id

[ Upstream commit 26907eb605fbc3ba9dbf888f21d9d8d04471271d ]

HSDK board has Micrel KSZ9031, recent commit
bcf3440c6dd ("net: phy: micrel: add phy-mode support for the KSZ9031 PHY")
caused a breakdown of Ethernet.
Using 'phy-mode = "rgmii"' is not correct because accodring RGMII
specification it is necessary to have delay on RX (PHY to MAX)
which is not generated in case of "rgmii".
Using "rgmii-id" adds necessary delay and solves the issue.

Also adding name of PHY placed on HSDK board.

Signed-off-by: Evgeniy Didin <Evgeniy.Didin@synopsys.com>
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/arc/boot/dts/hsdk.dts b/arch/arc/boot/dts/hsdk.dts
index ab01b75bfa67d..f6b6e3c9ca8aa 100644
--- a/arch/arc/boot/dts/hsdk.dts
+++ b/arch/arc/boot/dts/hsdk.dts
@@ -175,7 +175,7 @@
 			reg = <0x8000 0x2000>;
 			interrupts = <10>;
 			interrupt-names = "macirq";
-			phy-mode = "rgmii";
+			phy-mode = "rgmii-id";
 			snps,pbl = <32>;
 			snps,multicast-filter-bins = <256>;
 			clocks = <&gmacclk>;
@@ -193,7 +193,7 @@
 				#address-cells = <1>;
 				#size-cells = <0>;
 				compatible = "snps,dwmac-mdio";
-				phy0: ethernet-phy@0 {
+				phy0: ethernet-phy@0 { /* Micrel KSZ9031 */
 					reg = <0>;
 					ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
 					ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;