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

Since commit 61fccb2d6274 ("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
index c95ad177b097809d49bf7d206df3f2782d4bd4f9..1c1c1eae9cba49f19c70dc67316319605c01dd11 100644 (file)
--- 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";