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Message-ID: <20250117161804.p6qn653bagygwhib@skbuf>
Date: Fri, 17 Jan 2025 18:18:04 +0200
From: Vladimir Oltean <olteanv@...il.com>
To: Tristram.Ha@...rochip.com
Cc: maxime.chevallier@...tlin.com, Woojung.Huh@...rochip.com,
	andrew@...n.ch, davem@...emloft.net, edumazet@...gle.com,
	kuba@...nel.org, pabeni@...hat.com, UNGLinuxDriver@...rochip.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: dsa: microchip: Add SGMII port support
 to KSZ9477 switch

On Fri, Jan 17, 2025 at 12:56:14AM +0000, Tristram.Ha@...rochip.com wrote:
> The KSZ9477 SGMII module does use DesignWare IP, but its implementation
> is probably too old as some registers do not match.  When using XPCS
> driver link detection works but the SGMII port does not pass traffic for
> some SFPs.  It is probably doable to update the XPCS driver to work in
> KSZ9477, but there is no way to submit that patch as that may affect
> other hardware implementation.
> 
> One thing that is strange is that driver enables interrupt for 1000BaseX
> mode but not SGMII mode, but in KSZ9477 SGMII mode can trigger link up
> and link down interrupt but 1000BaseX can only trigger link up interrupt.

Sometimes, the "collaborative" aspect of open source projects does work
out, and you might get help, feedback and/or regression testing for
hardware you don't have. Sure, it doesn't always work out, but I suggest
you give it a try and not put the cart before the horses.

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