netdev - Re: [PATCH] net: phy: marvell: add special handling of Finisar modules with 81E1111

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Message-ID: <20201019210909.GX1551@shell.armlinux.org.uk>
Date:   Mon, 19 Oct 2020 22:09:09 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Robert Hancock <robert.hancock@...ian.com>, hkallweit1@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH] net: phy: marvell: add special handling of Finisar
 modules with 81E1111

On Mon, Oct 19, 2020 at 11:06:54PM +0200, Andrew Lunn wrote:
> On Mon, Oct 19, 2020 at 02:49:13PM -0600, Robert Hancock wrote:
> > The Finisar FCLF8520P2BTL 1000BaseT SFP module uses a Marvel 81E1111 PHY
> > with a modified PHY ID, and by default does not have 1000BaseX
> > auto-negotiation enabled, which is not generally desirable with Linux
> > networking drivers.
> 
> I could be wrong, but i thought phylink used SGMII with copper SFPs,
> so that 10/100 works as well as 1G. So why is 1000BaseX an issue?
> Do you have a MAC which cannot do SGMII, only 1000BaseX?

Indeed it does.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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