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-rw-r--r--target/linux/rockchip/patches-5.4/004-arm64-dts-rockchip-Add-txpbl-node-for-RK3399-RK3328.patch54
1 files changed, 54 insertions, 0 deletions
diff --git a/target/linux/rockchip/patches-5.4/004-arm64-dts-rockchip-Add-txpbl-node-for-RK3399-RK3328.patch b/target/linux/rockchip/patches-5.4/004-arm64-dts-rockchip-Add-txpbl-node-for-RK3399-RK3328.patch
new file mode 100644
index 0000000000..8931d5c5a9
--- /dev/null
+++ b/target/linux/rockchip/patches-5.4/004-arm64-dts-rockchip-Add-txpbl-node-for-RK3399-RK3328.patch
@@ -0,0 +1,54 @@
+From 8a469ee35606ba65448d54e5a2a23302f7e79e3c Mon Sep 17 00:00:00 2001
+From: Carlos de Paula <me@carlosedp.com>
+Date: Tue, 18 Feb 2020 17:10:37 -0500
+Subject: [PATCH] arm64: dts: rockchip: Add txpbl node for RK3399/RK3328
+
+Some rockchip SoCs like the RK3399 and RK3328 exhibit an issue
+where tx checksumming does not work with packets larger than 1498.
+
+The default Programmable Buffer Length for TX in these GMAC's is
+not suitable for MTUs higher than 1498. The workaround is to disable
+TX offloading with 'ethtool -K eth0 tx off rx off' causing performance
+impacts as it disables hardware checksumming.
+
+This patch sets snps,txpbl to 0x4 which is a safe number tested ok for
+the most popular MTU value of 1500.
+
+For reference, see https://lkml.org/lkml/2019/4/1/1382.
+
+Signed-off-by: Carlos de Paula <me@carlosedp.com>
+Link: https://lore.kernel.org/r/20200218221040.10955-1-me@carlosedp.com
+Signed-off-by: Heiko Stuebner <heiko@sntech.de>
+---
+ arch/arm64/boot/dts/rockchip/rk3328.dtsi | 2 ++
+ arch/arm64/boot/dts/rockchip/rk3399.dtsi | 1 +
+ 2 files changed, 3 insertions(+)
+
+--- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
+@@ -857,6 +857,7 @@
+ resets = <&cru SRST_GMAC2IO_A>;
+ reset-names = "stmmaceth";
+ rockchip,grf = <&grf>;
++ snps,txpbl = <0x4>;
+ status = "disabled";
+ };
+
+@@ -878,6 +879,7 @@
+ reset-names = "stmmaceth", "mac-phy";
+ phy-mode = "rmii";
+ phy-handle = <&phy>;
++ snps,txpbl = <0x4>;
+ status = "disabled";
+
+ mdio {
+--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
++++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+@@ -288,6 +288,7 @@
+ resets = <&cru SRST_A_GMAC>;
+ reset-names = "stmmaceth";
+ rockchip,grf = <&grf>;
++ snps,txpbl = <0x4>;
+ status = "disabled";
+ };
+