linux-kernel - Re: [PATCH net-next 0/9] net: dsa: vsc73xx: fix MDIO bus access and PHY operations

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Message-ID: <83562533-2291-40d9-8bf4-4e1f30188b61@lunn.ch>
Date: Tue, 30 Jul 2024 00:53:52 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Pawel Dembicki <paweldembicki@...il.com>
Cc: netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/9] net: dsa: vsc73xx: fix MDIO bus access and
 PHY operations

On Mon, Jul 29, 2024 at 11:06:06PM +0200, Pawel Dembicki wrote:
> The VSC73xx driver has issues with PHY configuration. This patch series
> fixes most of them.
> 
> The first patch fixes the phylink capabilities, because the MAC in the
> vsc73xx family doesn't handle 1000BASE HD mode.
> 
> The second patch synchronizes the register configuration routine with the
> datasheet recommendations.
> 
> Patches 3-5 restore proper communication on the MDIO bus. Currently,
> the write value isn't sent to the MDIO register, and without a mutex,
> communication with the PHY can be interrupted. This causes the PHY to
> receive improper configuration and autonegotiation could fail.
> 
> The sixth patch speeds up the internal MDIO bus to the maximum value
> allowed by the datasheet.
> 
> The seventh patch removes the PHY reset blockade, as it is no longer
> required.
> 
> After fixing the MDIO operations, autonegotiation became possible.
> The eighth patch removes the blockade, which became unnecessary after
> the MDIO operations fix. It also enables the MDI-X feature, which is
> disabled by default in forced 100BASE-TX mode like other Vitesse PHYs.
> 
> The last patch implements the downshift feature and enables it by default.

Please separate fixes from new development. Fixed should target net,
while new features should be for net-next.

      Andrew