linux-kernel - Re: [PATCH net-next] net: phy: marvell: Fix 88e1510 downshift counter errata

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Message-ID: <aLbyju1nKm5LXDDX@shell.armlinux.org.uk>
Date: Tue, 2 Sep 2025 14:35:10 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: rohan.g.thomas@...era.com
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Matthew Gerlach <matthew.gerlach@...era.com>
Subject: Re: [PATCH net-next] net: phy: marvell: Fix 88e1510 downshift
 counter errata

On Tue, Sep 02, 2025 at 01:59:57PM +0800, Rohan G Thomas via B4 Relay wrote:
> From: Rohan G Thomas <rohan.g.thomas@...era.com>
> 
> The 88e1510 PHY has an erratum where the phy downshift counter is not
> cleared on a link power down/up. This can cause the gigabit link to
> intermittently downshift to a lower speed.

Does this apply to all 88e1510 PHYs or just some revisions?

Also, what is a "link power down/up" ? Are you referring to setting
BMCR_PDOWN and then clearing it? (please update the commit description
and repost after 24 hours, thanks.)

-- 
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