mvebu: uDPU: switch default kernel and U-Boot PHY mode

Certain SFP modules (most notably Nokia GPON ones) first check
connectivity on 1000base-x, and switch to 2500base-x afterwards. This
is considered a quirk so the phylink switches the interface to
2500base-x as well.

However, after power-cycling the uDPU device, network interface/SFP module
will not work correctly until the module is re-seated. This patch
resolves this issue by forcing the interface to be brought up in
2500base-x mode by default.

Signed-off-by: Jakov Petrina <jakov.petrina@sartura.hr>
Signed-off-by: Vladimir Vid <vladimir.vid@sartura.hr>
Cc: Luka Perkov <luka.perkov@sartura.hr>

1 files changed, 20 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-5.4/550-arm64-dts-uDPU-switch-PHY-operation-mode-to-2500base.patch b/target/linux/mvebu/patches-5.4/550-arm64-dts-uDPU-switch-PHY-operation-mode-to-2500base.patch
new file mode 100644
index 0000000000..82715312d8
--- /dev/null
+++ b/target/linux/mvebu/patches-5.4/550-arm64-dts-uDPU-switch-PHY-operation-mode-to-2500base.patch
@@ -0,0 +1,20 @@
+--- a/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
++++ b/arch/arm64/boot/dts/marvell/armada-3720-uDPU.dts
+@@ -144,7 +144,7 @@
+ };
+ 
+ &eth0 {
+-	phy-mode = "sgmii";
++	phy-mode = "2500base-x";
+ 	status = "okay";
+ 	managed = "in-band-status";
+ 	phys = <&comphy1 0>;
+@@ -152,7 +152,7 @@
+ };
+ 
+ &eth1 {
+-	phy-mode = "sgmii";
++	phy-mode = "2500base-x";
+ 	status = "okay";
+ 	managed = "in-band-status";
+ 	phys = <&comphy0 1>;