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

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Message-ID: <56d123a3-542e-412b-ab15-ab29b49fe40e@quicinc.com>
Date: Tue, 1 Oct 2024 11:06:07 -0700
From: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
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 10/1/2024 4:59 AM, Russell King (Oracle) wrote:
> 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:
> 
No worries, Russell. Thank you for your guidance. 

>> +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.
> 
Noted!

> Other than that, the patch looks the best solution.
> 
> Thanks.
>