[openwrt/openwrt] arm64: dts: rockchip: Add txpbl node for RK3399/RK3328

[LEDE Commits]

blocktrron pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/5a57a1ac1faaa8920ec36f070963b0a976a29525

commit 5a57a1ac1faaa8920ec36f070963b0a976a29525
Author: David Bauer <mail at david-bauer.net>
AuthorDate: Mon Jul 27 21:34:24 2020 +0200

    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 at carlosedp.com>
    Link: https://lore.kernel.org/r/20200218221040.10955-1-me@carlosedp.com
    Signed-off-by: Heiko Stuebner <heiko at sntech.de>
    Signed-off-by: David Bauer <mail at david-bauer.net>
---
 ...rockchip-Add-txpbl-node-for-RK3399-RK3328.patch | 54 ++++++++++++++++++++++
 1 file changed, 54 insertions(+)

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 at 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 at carlosedp.com>
+Link: https://lore.kernel.org/r/20200218221040.10955-1-me@carlosedp.com
+Signed-off-by: Heiko Stuebner <heiko at 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";
+ 	};
+