netdev - Re: [PATCH net-next 0/4] Add support for slow-to-probe-PHY copper SFP modules

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Date:   Wed, 11 Dec 2019 12:46:28 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     linux@...linux.org.uk
Cc:     andrew@...n.ch, f.fainelli@...il.com, hkallweit1@...il.com,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next 0/4] Add support for slow-to-probe-PHY copper
 SFP modules

From: Russell King - ARM Linux admin <linux@...linux.org.uk>
Date: Mon, 9 Dec 2019 14:15:25 +0000

> This series, following on from the previous adding SFP+ copper support,
> adds support for a range of Copper SFP modules, made by a variety of
> companies, all of which have a Marvell 88E1111 PHY on them, but take
> far longer than the Marvell spec'd 15ms to start communicating on the
> I2C bus.
> 
> Researching the Champion One 1000SFPT module reveals that TX_DISABLE is
> routed through a MAX1971 switching regulator and reset IC which adds a
> 175ms delay to releasing the 88E1111 reset.
> 
> It is not known whether other modules use a similar setup, but there
> are a range of modules that are slow for the Marvell PHY to appear.
> 
> This patch series adds support for these modules by repeatedly trying
> to probe the PHY for up to 600ms.

Series applied.