arm64: dts: r8a7796: Use rgmii-txid phy-mode for EthernetAVB

KAZUMIZU · horms · commit 325f39010b43 · 2017-03-06T09:54:26.000+01:00
Since commit 61fccb2 ("ravb: Add tx and rx clock internal delays mode of APSR") the EthernetAVB driver enables tx and rx clock internal delay modes (TDM and RDM) depending on the phy mode as follows: phy mode | ASPR delay mode -----------+---------------- rgmii-id | TDM and RDM rgmii-rxid | RDM rgmii-txid | TDM And prior to the above commit no internal delay mode settings were implemented for any phy mode. With this and the above change present tx internal delay mode is enabled which has been observed to address failures in the case of 1Gbps communication using the by salvator-x board with the KSZ9031RNX phy. This has been reported to occur with both the r8a7795 (H3) and r8a7796 (M3-W) SoCs. With the above patch present but this patch present tx and rx internal delay modes are enabled; and with the above patch and this present absent no internal delay modes are enabled. In both cases failures have been observed when using 1Gbps communication in the environments described above. Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> Signed-off-by: Takeshi Kihara <takeshi.kihara.df@renesas.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
diff --git a/arch/arm64/boot/dts/renesas/r8a7796.dtsi b/arch/arm64/boot/dts/renesas/r8a7796.dtsi
@@ -483,7 +483,7 @@
 					  "ch24";
 			clocks = <&cpg CPG_MOD 812>;
 			power-domains = <&sysc R8A7796_PD_ALWAYS_ON>;
-			phy-mode = "rgmii-id";
+			phy-mode = "rgmii-txid";
 			#address-cells = <1>;
 			#size-cells = <0>;
 			status = "disabled";
