linux-kernel - Re: [PATCH v3 06/13] net: phy: add qca8081 read

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Date:   Tue, 19 Oct 2021 20:48:18 +0800
From:   Jie Luo <quic_luoj@...cinc.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Luo Jie <luoj@...eaurora.org>, 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 06/13] net: phy: add qca8081 read_status


On 10/19/2021 8:31 PM, Andrew Lunn wrote:
> On Tue, Oct 19, 2021 at 08:10:15PM +0800, Jie Luo wrote:
>> On 10/19/2021 5:42 AM, Andrew Lunn wrote:
>>>> +static int qca808x_read_status(struct phy_device *phydev)
>>>> +{
>>>> +	int ret;
>>>> +
>>>> +	ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
>>>> +	if (ret < 0)
>>>> +		return ret;
>>>> +
>>>> +	linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->lp_advertising,
>>>> +			ret & MDIO_AN_10GBT_STAT_LP2_5G);
>>>> +
>>> Could genphy_c45_read_lpa() be used here?
>>>
>>>         Andrew
>> Hi Andrew,
>>
>> Thanks for the comments,  the MDIO_STAT1 of PHY does not follow the
>> standard, bit0~bit6 of MDIO_STAT1 are
>>
>> always 0, genphy_c45_read_lpa can't be used.
> O.K. It is a shame the hardware partially follow the standard, but
> breaks it as well. Why go to the effort of partially following it,
> when you don't gain anything from it because you need custom code
> anyway?
>
> 	Andrew

Hi Andrew,

Thanks for the suggestion. qca8081 PHY indeed add 2.5G capability based 
on the

general 1G PHY, i will feedback this to the HW design team, thanks for 
this comments.