linux-kernel - Re: [PATCH] arm64: defconfig: Change CONFIG_AT803X

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Date:   Thu, 28 Nov 2019 10:11:51 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Oliver Graute <oliver.graute@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, Peng Fan <peng.fan@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Anson Huang <anson.huang@....com>,
        André Draszik <git@...red.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        dl-linux-imx <linux-imx@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH] arm64: defconfig: Change CONFIG_AT803X_PHY from m to y

On 27/11/2019 13:46, Oliver Graute wrote:

> On 27/11/19, Marc Gonzalez wrote:
>
>> On 26/11/2019 15:54, Oliver Graute wrote:
>>
>>> this patch broke my imx8qm nfs setup. With the generic phy driver my
>>> board is booting fine. But with the AT803X_PHY=y enabled  I'm running
>>> into the following phy issue. So on my side it looks inverse as on
>>> yours. What is the best proposal to fix this?
>>>
>>> [    5.550442] fec 5b040000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
>>> [    5.573206] Sending DHCP requests ...... timed out!
>>> [   95.339702] IP-Config: Retrying forever (NFS root)...
>>> [   95.348873] Atheros 8035 ethernet 5b040000.ethernet-1:06: attached PHY driver [Atheros 8035 ethernet] (mii_bus:phy_addr=5b040000.ethernet-1:06, irq=POLL)
>>> [   99.438443] fec 5b040000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
>>> [   99.461206] Sending DHCP requests ...... timed out!
>>
>> Which DTS are you using?
> 
> I'am using this DTS which I'am currently working on:
> 
> https://lists.infradead.org/pipermail/linux-arm-kernel/2019-October/689501.html
>>
>> I bet one dollar that 6d4cd041f0af triggered a latent bug in the DTS.
> 
> So what should I fix in my device tree?

In the board DTS I used to work on, I had this:

&eth0 {
	phy-connection-type = "rgmii-id";
	phy-handle = <&eth0_phy>;
	#address-cells = <1>;
	#size-cells = <0>;

	/* Atheros AR8035 */
	eth0_phy: ethernet-phy@4 {
		compatible = "ethernet-phy-id004d.d072",
			     "ethernet-phy-ieee802.3-c22";
		interrupts = <37 IRQ_TYPE_EDGE_RISING>;
		reg = <4>;
	};
};

In your DTS, you #include "imx8qm.dtsi"
I found no such file:
$ git ls-files | grep imx8qm
drivers/pinctrl/freescale/pinctrl-imx8qm.c
include/dt-bindings/pinctrl/pads-imx8qm.h

In your patch:
https://patchwork.kernel.org/patch/11211567/

+&fec1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_fec1>;
+	phy-mode = "rgmii-txid";
+	phy-handle = <&ethphy0>;
+	fsl,magic-packet;
+	fsl,rgmii_rxc_dly;
+	status = "okay";
+
+	mdio {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		ethphy0: ethernet-phy@0 {
+			compatible = "ethernet-phy-ieee802.3-c22";
+			reg = <4>;
+			at803x,eee-disabled;
+			at803x,vddio-1p8v;
+		};
+	};
+};

Try all possible 'phy-mode' (rgmii, rgmii-id, rgmii-rxid, rgmii-txid)
Investigate 'fsl,rgmii_rxc_dly' (it's not a standard Linux DT prop)
Documentation/devicetree/bindings/net/ethernet-controller.yaml

Regards.