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arm64: dts: rockchip: fix rock64 gmac2io stability issues 

This commit enables thresh dma mode as this forces to disable checksuming,
and chooses delay values which make the interface stable.

These changes are needed, because ROCK64 is faced with two problems:
1. tx checksuming does not work with packets larger than 1498,
2. the default delays for tx/rx are not stable when using 1Gbps connection.

Delays were found out with:
https://github.com/ayufan-rock64/linux-build/tree/master/recipes/gmac-delays-test

Signed-off-by: Kamil Trzciński <ayufan@ayufan.eu>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
hifive-unleashed-5.1
Kamil Trzciński 2018-01-22 18:46:22 +01:00 committed by Heiko Stuebner
parent 7928b2cbe5
commit 73e42e1866
1 changed files with 3 additions and 4 deletions
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7
arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
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@ -132,17 +132,16 @@
assigned-clocks = <&cru SCLK_MAC2IO>, <&cru SCLK_MAC2IO_EXT>;
assigned-clock-parents = <&gmac_clkin>, <&gmac_clkin>;
clock_in_out = "input";
/* shows instability at 1GBit right now */
max-speed = <100>;
phy-supply = <&vcc_io>;
phy-mode = "rgmii";
pinctrl-names = "default";
pinctrl-0 = <&rgmiim1_pins>;
snps,force_thresh_dma_mode;
snps,reset-gpio = <&gpio1 RK_PC2 GPIO_ACTIVE_LOW>;
snps,reset-active-low;
snps,reset-delays-us = <0 10000 50000>;
tx_delay = <0x26>;
rx_delay = <0x11>;
tx_delay = <0x24>;
rx_delay = <0x18>;
status = "okay";
};