netdev - Re: [PATCH net-next v5] net: phy: marvell: add special handling of Finisar modules with 88E1111

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Message-ID: <20201030171402.2adf62f4@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Fri, 30 Oct 2020 17:14:02 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Robert Hancock <robert.hancock@...ian.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v5] net: phy: marvell: add special handling of
 Finisar modules with 88E1111

On Wed, 28 Oct 2020 11:15:40 -0600 Robert Hancock wrote:
> The Finisar FCLF8520P2BTL 1000BaseT SFP module uses a Marvel 88E1111 PHY
> with a modified PHY ID. Add support for this ID using the 88E1111
> methods.
> 
> By default these modules do not have 1000BaseX auto-negotiation enabled,
> which is not generally desirable with Linux networking drivers. Add
> handling to enable 1000BaseX auto-negotiation when these modules are
> used in 1000BaseX mode. Also, some special handling is required to ensure
> that 1000BaseT auto-negotiation is enabled properly when desired.
> 
> Based on existing handling in the AMD xgbe driver and the information in
> the Finisar FAQ:
> https://www.finisar.com/sites/default/files/resources/an-2036_1000base-t_sfp_faqreve1.pdf
> 
> Signed-off-by: Robert Hancock <robert.hancock@...ian.com>
> Reviewed-by: Russell King <rmk+kernel@...linux.org.uk>

Applied, thanks!