netdev - Re: [PATCH net v5 1/2] net: phy: aquantia: AQR115c fix up PMA capabilities

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Message-ID: <ZvvkEYYljV4IWlJH@shell.armlinux.org.uk>
Date: Tue, 1 Oct 2024 12:59:13 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Abhishek Chauhan <quic_abchauha@...cinc.com>
Cc: "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,
	Andrew Halaney <ahalaney@...hat.com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Brad Griffis <bgriffis@...dia.com>,
	Vladimir Oltean <vladimir.oltean@....com>,
	Jon Hunter <jonathanh@...dia.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>, kernel@...cinc.com
Subject: Re: [PATCH net v5 1/2] net: phy: aquantia: AQR115c fix up PMA
 capabilities

On Mon, Sep 30, 2024 at 03:33:40PM -0700, Abhishek Chauhan wrote:
> AQR115c reports incorrect PMA capabilities which includes
> 10G/5G and also incorrectly disables capabilities like autoneg
> and 10Mbps support.
> 
> AQR115c as per the Marvell databook supports speeds up to 2.5Gbps
> with autonegotiation.

Thanks for persisting with this. Just one further item:

> +static int aqr115c_get_features(struct phy_device *phydev)
> +{
> +	/* PHY FIXUP */
> +	/* Phy supports Speeds up to 2.5G with Autoneg though the phy PMA says otherwise */
> +	linkmode_or(phydev->supported, phydev->supported, phy_gbit_features);
> +	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported);

I'd still prefer to see:

	unsigned long *supported = phydev->supported;

	/* PHY supports speeds up to 2.5G with autoneg. PMA capabilities
	 * are not useful.
	 */
	linkmode_or(supported, supported, phy_gbit_features);
	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, supported);

because that avoids going over column 80, and networking prefers it that
way.

Other than that, the patch looks the best solution.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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