netdev - Re: Marvell 88E6320 connected to i.MX8MN

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Date:   Thu, 27 Oct 2022 23:24:40 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        "tharvey@...eworks.com" <tharvey@...eworks.com>,
        netdev <netdev@...r.kernel.org>, Marek Vasut <marex@...x.de>,
        Fabio Estevam <festevam@...x.de>
Subject: Re: Marvell 88E6320 connected to i.MX8MN

 Hi Vladimir,

On Thu, Oct 27, 2022 at 5:41 PM Vladimir Oltean <vladimir.oltean@....com> wrote:

> Looks like you are missing the Marvell PHY driver; the generic PHY
> driver gets used. Can you enable CONFIG_MARVELL_PHY?

CONFIG_MARVELL_PHY is already selected.

However, there is no support for 88E6320 in the Marvell PHY driver.

Thanks



> > device eth0 entered promiscuous mode
> > DSA: tree 0 setup
> > ...
> >
> > ~# udhcpc -i lan4
> > udhcpc: started, v1.31.1
> > [   25.174846] mv88e6085 30be0000.ethernet-1:00 lan4: configuring for
> > phy/gmii link mode
> > udhcpc: sending discover
> > [   27.242123] mv88e6085 30be0000.ethernet-1:00 lan4: Link is Up -
> > 100Mbps/Full - flow control rx/tx
> > [   27.251064] IPv6: ADDRCONF(NETDEV_CHANGE): lan4: link becomes ready
> > udhcpc: sending discover
> > udhcpc: sending discover
> > udhcpc: sending discover
> > ...
> >
> > This is my devicetree:
> > https://pastebin.com/raw/TagQJK2a
> >
> > The only way that I can get IP via DHCP to work in the kernel is if
> > I access the network inside U-Boot first and launch the kernel afterward.
> >
> > It looks like U-Boot is doing some configuration that the kernel is missing.
>
> Yeah, sounds like the Marvell PHY driver could be what's the difference.
>
> > Does anyone have any suggestions, please?
>
> If that doesn't work, the next step is to isolate things. Connect a
> cable to the other switch port, create a bridge, and forward packets
> between one station and the other. This doesn't involve the CPU port, so
> you'll learn if the internal PHYs are the problem or the CPU port is.
> Next step would be to collect ethtool -S lan0, ethtool -S eth0, and post
> those.