linux-kernel - Re: [PATCH net v3 1/2] net: phy: aquantia: AQR115c fix up PMA capabilities

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Message-ID: <ed33f7a4-89b1-4090-bcb5-14f2d98cbd75@quicinc.com>
Date: Thu, 26 Sep 2024 17:17:47 -0700
From: "Abhishek Chauhan (ABC)" <quic_abchauha@...cinc.com>
To: Maxime Chevallier <maxime.chevallier@...tlin.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>,
        "Russell King (Oracle)" <linux@...linux.org.uk>,
        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>,
        "Przemek Kitszel" <przemyslaw.kitszel@...el.com>, <kernel@...cinc.com>
Subject: Re: [PATCH net v3 1/2] net: phy: aquantia: AQR115c fix up PMA
 capabilities



On 9/25/2024 11:42 PM, Maxime Chevallier wrote:
> Hello,
> 
> On Wed, 25 Sep 2024 16:01:28 -0700
> Abhishek Chauhan <quic_abchauha@...cinc.com> 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.
>>
>> Fixes: 0ebc581f8a4b ("net: phy: aquantia: add support for aqr115c")
>> Link: https://lore.kernel.org/all/20240913011635.1286027-1-quic_abchauha@quicinc.com/T/
>> Signed-off-by: Abhishek Chauhan <quic_abchauha@...cinc.com>
>> ---
> 
> [...]
> 
>>  
>> +static int aqr115c_get_features(struct phy_device *phydev)
>> +{
>> +	int ret;
>> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
>> +
>> +	/* Normal feature discovery */
>> +	ret = genphy_c45_pma_read_abilities(phydev);
>> +	if (ret)
>> +		return ret;
>> +
>> +	/* PHY FIXUP */
>> +	/* Although the PHY sets bit 12.18.19.48, it does not support 5G/10G modes */
>> +	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, phydev->supported);
>> +	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, phydev->supported);
>> +	linkmode_clear_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, phydev->supported);
>> +	linkmode_clear_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT, phydev->supported);
>> +
>> +	/* Phy supports Speeds up to 2.5G with Autoneg though the phy PMA says otherwise */
>> +	linkmode_copy(supported, phy_gbit_features);
>> +	linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseX_Full_BIT, supported);
> 
> I still think you shouldn't report 2500BaseX, as you mentionned
> it's a BaseT PHY. This is independent of the modes that the PHY uses to
> connect to the MAC. Although the PHY can talk to the MAC using
> 2500BaseX on its MII interface, it looks like it can't use
> 2500BaseX on its MDI (the LP side of the PHY). There's the same issue in
> patch 2.
> 
I Agree with you. I did some experiments today without setting the 2500BaseX bit and i see
the link still comes up with 2.5Gbps with autoneg on. 

I will rectify this as part of the next patch 

Thanks Maxime 


> Thanks,
> 
> Maxime