linux-kernel - Re: net: phy: marvell: network working with generic PHY and not with marvell PHY

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Message-ID: <YdQsJnfqjaFrtC0m@shell.armlinux.org.uk>
Date:   Tue, 4 Jan 2022 11:14:46 +0000
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     linus.walleij@...aro.org, ulli.kroll@...glemail.com,
        kuba@...nel.org, davem@...emloft.net, andrew@...n.ch,
        hkallweit1@...il.com, linux-arm-kernel@...ts.infradead.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: net: phy: marvell: network working with generic PHY and not with
 marvell PHY

On Tue, Jan 04, 2022 at 11:58:01AM +0100, Corentin Labbe wrote:
> Hello
> 
> I have a gemini SSI 1328 box which has a cortina ethernet MAC with a Marvell 88E1118 as given by:
> Marvell 88E1118 gpio-0:01: attached PHY driver (mii_bus:phy_addr=gpio-0:01, irq=POLL)
> So booting with CONFIG_MARVELL_PHY=y lead to a non-working network with link set at 1Gbit
> Setting 'max-speed = <100>;' (as current state in mainline dtb) lead to a working network.
> By not working, I mean kernel started with ip=dhcp cannot get an IP.

How is the PHY connected to the host (which interface mode?) If it's
RGMII, it could be that the wrong RGMII interface mode is specified in
DT.

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