i.MX ProcessorsのトピックRe: Ethernet issue with KSZ9021

Ethernet issue with KSZ9021

khaleel — Wed, 28 Jul 2021 11:23:12 GMT

Hello Team,

We have designed a custom board with imx8m mini in which we have selected KSZ9021 as PHY .

PHY configuration

phy addr : 0

LED Mode : Tricolour Dual LED

125MHZ CLK DISABLE

RGMII mode - Advertise all capabilities
(10/100/1000 speed half-/full-duplex)

Kernel device tree support :

CONFIG_MICREL_PHY=y

&fec1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_fec1>;
phy-mode = "rgmii-id";
phy-handle = <&ethphy0>;
phy-reset-gpios = <&gpio3 16 GPIO_ACTIVE_LOW>;
phy-reset-post-delay = <150>;
phy-reset-duration = <10>;
fsl,magic-packet;
status = "okay";
mdio {
#address-cells = <1>;
#size-cells = <0>;
ethphy0: ethernet-phy@0 {
compatible = "ethernet-phy-ieee802.3-c22";
reg = <0>;
};
};
};

With this configuration PHY is detecting and i'm getting eth0 node in rootfilesystem.

Issue : When i try to assign an ip with dhclient, it unable to get an ip. Tried assigning ip manually but unable to ping dns or google.

ethtool output : Phy has been detected successfully

root@imx8mmpds:~# ethtool eth0 Settings for eth0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: Symmetric Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: Symmetric Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Link partner advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Link partner advertised pause frame use: Symmetric Link partner advertised auto-negotiation: Yes Link partner advertised FEC modes: Not reported Speed: 100Mb/s Duplex: Full Port: MII PHYAD: 0 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Link detected: yes

query's :

1) Is my device tree looks fine ?

2) Any driver modifications or fix ups required for KSZ9021 to work?

Best Regards

khaleel

Re: Ethernet issue with KSZ9021

weidong_sun — Wed, 28 Jul 2021 23:54:26 GMT

Hi,

I have ever used ksz9031 for i.MX8MM, see attachment, please!

In addition, if you used 3.3V IO between CPU and ksz9021, you should disable pull-up/down feature of ENET pads. If pull-up/down resistors are needed, external pull should be used.

for disabling ENET pin's pull up/down, re-configure these pins , please!

---------------------------------

MX8MM_IOMUXC_ENET_MDC_ENET1_MDC 0x3
MX8MM_IOMUXC_ENET_MDIO_ENET1_MDIO 0x3
MX8MM_IOMUXC_ENET_TD3_ENET1_RGMII_TD3 0x1f
MX8MM_IOMUXC_ENET_TD2_ENET1_RGMII_TD2 0x1f
MX8MM_IOMUXC_ENET_TD1_ENET1_RGMII_TD1 0x1f
MX8MM_IOMUXC_ENET_TD0_ENET1_RGMII_TD0 0x1f
MX8MM_IOMUXC_ENET_RD3_ENET1_RGMII_RD3 0x91
MX8MM_IOMUXC_ENET_RD2_ENET1_RGMII_RD2 0x91
MX8MM_IOMUXC_ENET_RD1_ENET1_RGMII_RD1 0x91
MX8MM_IOMUXC_ENET_RD0_ENET1_RGMII_RD0 0x91
MX8MM_IOMUXC_ENET_TXC_ENET1_RGMII_TXC 0x1f
MX8MM_IOMUXC_ENET_RXC_ENET1_RGMII_RXC 0x91
MX8MM_IOMUXC_ENET_RX_CTL_ENET1_RGMII_RX_CTL 0x91
MX8MM_IOMUXC_ENET_TX_CTL_ENET1_RGMII_TX_CTL 0x1f
MX8MM_IOMUXC_GPIO1_IO07_GPIO1_IO7 0x19

-----------------------------------------------

For 1.8V IO, default configurations are OK, don't need to re-configure them.

Have a nice day!

Regards,

weidong

Re: Ethernet issue with KSZ9021

khaleel — Mon, 02 Aug 2021 09:02:51 GMT

Hi weidong,

Thank you for the reply.

KSZ9021 supports only 3.3V/2.5V, In our custom board we are using 2.5V as IO voltage.

Do i still need to reconfigure ENET pads?

Best regards

khaleel