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

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Date:   Tue, 4 Jan 2022 12:33:15 +0100
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     "Russell King (Oracle)" <linux@...linux.org.uk>
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

Le Tue, Jan 04, 2022 at 11:14:46AM +0000, Russell King (Oracle) a écrit :
> 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.
> 

The PHY is set as RGMII in DT (arch/arm/boot/dts/gemini-ssi1328.dts)
The only change to the mainline dtb is removing the max-speed.

Regards