linux-kernel - Re: [PATCH v3 08/13] net: phy: add qca8081 config

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Date:   Tue, 19 Oct 2021 20:12:52 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Andrew Lunn <andrew@...n.ch>, Luo Jie <luoj@...eaurora.org>
Cc:     hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, sricharan@...eaurora.org
Subject: Re: [PATCH v3 08/13] net: phy: add qca8081 config_aneg


On 10/19/2021 5:37 AM, Andrew Lunn wrote:
> On Mon, Oct 18, 2021 at 11:33:28AM +0800, Luo Jie wrote:
>> Reuse at803x phy driver config_aneg excepting
>> adding 2500M auto-negotiation.
>>
>> Signed-off-by: Luo Jie <luoj@...eaurora.org>
>> ---
>>   drivers/net/phy/at803x.c | 26 +++++++++++++++++++++++++-
>>   1 file changed, 25 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
>> index 0c22ef735230..c124d3fe40fb 100644
>> --- a/drivers/net/phy/at803x.c
>> +++ b/drivers/net/phy/at803x.c
>> @@ -1084,7 +1084,30 @@ static int at803x_config_aneg(struct phy_device *phydev)
>>   			return ret;
>>   	}
>>   
>> -	return genphy_config_aneg(phydev);
>> +	/* Do not restart auto-negotiation by setting ret to 0 defautly,
>> +	 * when calling __genphy_config_aneg later.
>> +	 */
>> +	ret = 0;
>> +
>> +	if (phydev->drv->phy_id == QCA8081_PHY_ID) {
>> +		int phy_ctrl = 0;
>> +
>> +		/* The reg MII_BMCR also needs to be configured for force mode, the
>> +		 * genphy_config_aneg is also needed.
>> +		 */
>> +		if (phydev->autoneg == AUTONEG_DISABLE)
>> +			genphy_c45_pma_setup_forced(phydev);
>> +
>> +		if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->advertising))
>> +			phy_ctrl = MDIO_AN_10GBT_CTRL_ADV2_5G;
>> +
>> +		ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
>> +				MDIO_AN_10GBT_CTRL_ADV2_5G, phy_ctrl);
> Does the PHY also have MDIO_MMD_AN, MDIO_AN_ADVERTISE ? I'm wondering
> if you can use genphy_c45_an_config_aneg()
>
>     Andrew
Thanks Andrew for this comments, since the PHY does not have the regiser 
MDIO_AN_ADVERTISE,

genphy_c45_an_config_aneg can't be used here.