linux-kernel - Re: [PATCH RFC net-next 1/2] net: pcs: xpcs: Add special code to operate in Microchip KSZ9477 switch

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Message-ID: <20250128154305.sqp55y5d5lc3d5tj@skbuf>
Date: Tue, 28 Jan 2025 17:43:05 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Tristram.Ha@...rochip.com
Cc: Woojung Huh <woojung.huh@...rochip.com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC net-next 1/2] net: pcs: xpcs: Add special code to
 operate in Microchip KSZ9477 switch

On Mon, Jan 27, 2025 at 07:32:25PM -0800, Tristram.Ha@...rochip.com wrote:
> However SGMII mode in KSZ9477 has a bug in which the current speed
> needs to be set in MII_BMCR to pass traffic.  The current driver code
> does not do anything when link is up with auto-negotiation enabled, so
> that code needs to be changed for KSZ9477.

Does this claimed SGMII bug have an erratum number like Microchip usually
assign for something this serious? Is it something we can look up?