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Message-ID: <20240403111125.ef2jxiq2am4bbtmf@skbuf>
Date: Wed, 3 Apr 2024 14:11:25 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: Michael Walle <mwalle@...nel.org>
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Andrew Lunn <andrew@...n.ch>,
	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: sja1105: Fix parameters order in
 sja1110_pcs_mdio_write_c45()

On Wed, Apr 03, 2024 at 10:06:51AM +0200, Michael Walle wrote:
> Vladimir, do you happen to know if some of your boards will use this
> function? Just wondering because it was never noticed.
> 
> -michael

The SJA1110 uses the XPCS only for SGMII and 2500Base-X links. On the
Bluebox3 I have (which is currently in a cardboard box for the time
being, so I will have to rely on static analysis just like everybody
else), these links are the cascade ports between switches. However,
those cascade ports are only used for autonomous traffic bridging (the
board has a weird "H" topology). Traffic terminated on the CPU doesn't
go through the SGMII links, so this is why I haven't noticed it during
casual testing.

However, there are other NXP systems using downstream device trees which
are likely impacted, but they are on older kernels and probably haven't
seen the regression just yet. So the fix is welcome.

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