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

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Message-ID: <20201019222153.GZ1551@shell.armlinux.org.uk>
Date:   Mon, 19 Oct 2020 23:21:53 +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" <hkallweit1@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] net: phy: marvell: add special handling of Finisar
 modules with 81E1111

On Tue, Oct 20, 2020 at 12:12:32AM +0200, Andrew Lunn wrote:
> > The auto-negotiation is a bit of a weird thing in this case, as there
> > are two negotiations occurring, the 1000BaseX between the PCS/PMA PHY
> > and the module PHY, and the 1000BaseT between the module PHY and the
> > copper link partner. I believe the 88E1111 has some smarts to delay the
> > copper negotiation until it gets the advertisement over 1000BaseX, uses
> > those to figure out its advertisement, and then uses the copper link
> > partner's response to determine the 1000BaseX response.
> 
> But as far as i know you can only report duplex and pause over
> 1000BaseX, not speed, since it is always 1G.

That is correct.

-- 
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