netdev - Re: BeagleBone Black Ethernet PHY issues

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Message-ID: <CAOCHtYgRD_HTD1F-5+CQ3H1PK3Lbhb-ZdyqDYp3wN2wRK5vOUA@mail.gmail.com>
Date: Wed, 30 Oct 2024 10:00:03 -0500
From: Robert Nelson <robertcnelson@...il.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: ext Tony Lindgren <tony@...mide.com>, Siddharth Vadapalli <s-vadapalli@...com>, 
	Roger Quadros <rogerq@...nel.org>, 
	"open list:TI ETHERNET SWITCH DRIVER (CPSW)" <linux-omap@...r.kernel.org>, netdev <netdev@...r.kernel.org>, 
	Matti Vaittinen <mazziesaccount@...il.com>, Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: BeagleBone Black Ethernet PHY issues

On Tue, Oct 29, 2024 at 12:18 PM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
>
> Hi all,
>
> During the last few months, booting kernels on BeagleBone Black
> sometimes fails with:
>
>     +SMSC LAN8710/LAN8720 4a101000.mdio:00: probe with driver SMSC
> LAN8710/LAN8720 failed with error -5
>      davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00,
> driver SMSC LAN8710/LAN8720
>      soc_device_match(cpsw_soc_devices): no match
>      cpsw-switch 4a100000.switch: initialized cpsw ale version 1.4
>      ...
>      am335x-phy-driver 47401300.usb-phy: dummy supplies not allowed
> for exclusive requests (id=vbus)
>     +cpsw-125mhz-clkctrl:0014:0: failed to disable
>      am335x-phy-driver 47401b00.usb-phy: using DT
> '/ocp/target-module@...00000/usb-phy@...0' for 'reset' GPIO lookup
>      ...
>      cpsw-switch 4a100000.switch: starting ndev. mode: dual_mac
>     -SMSC LAN8710/LAN8720 4a101000.mdio:00: attached PHY driver
> (mii_bus:phy_addr=4a101000.mdio:00, irq=POLL)
>     -cpsw-switch 4a100000.switch eth0: Link is Up - 100Mbps/Full -
> flow control off
>     -Sending DHCP requests ., OK
>     -IP-Config: Complete:
>     -[...]
>     +cpsw-switch 4a100000.switch: phy
> "/ocp/interconnect@...00000/segment@...arget-module@...000/switch@...dio@...0/ethernet-phy@0"
> not found on slave 0
>     +[HANG]
>
> Adding debug prints to smsc_phy_probe() makes the issue go away, so it
> must be timing related.
>
> Adding specific debug prints in the failure case gives:
>
>     SMSC LAN8710/LAN8720 4a101000.mdio:00: genphy_read_abilities:2859:
> phy_read(MII_BMSR) failed -EIO
>     SMSC LAN8710/LAN8720 4a101000.mdio:00: phy_probe:3613:
> genphy_read_abilities() failed -EIO
>     SMSC LAN8710/LAN8720 4a101000.mdio:00: probe with driver SMSC
> LAN8710/LAN8720 failed with error -5
>
> and later:
>
>     Generic PHY 4a101000.mdio:00: genphy_read_abilities:2859:
> phy_read(MII_BMSR) failed -EIO
>     Generic PHY 4a101000.mdio:00: phy_probe:3609:
> genphy_read_abilities failed -EIO
>     cpsw-switch 4a100000.switch: phy
> "/ocp/interconnect@...00000/segment@...arget-module@...000/switch@...dio@...0/ethernet-phy@0"
> not found on slave 0

Hey Geert,

What revision of the board do you have, Bx, Cx, etc.

Only C3 has the new PCB with the phy 'reset' gpio line.

https://openbeagle.org/beagleboard/beaglebone-black/-/blob/master/BBB_SCH.pdf?ref_type=heads

For pre-C3 boards, removing "C24" has fixed a large percentage of my
boards in my ci test farm, while it's not a perfect fix as some still
fail..

Regards,

-- 
Robert Nelson
https://rcn-ee.com/