diff options
| -rw-r--r-- | target/linux/rockchip/patches-5.4/004-arm64-dts-rockchip-Add-txpbl-node-for-RK3399-RK3328.patch | 54 |
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"; + }; + |