linux-kernel - Re: [PATCH net-next v3] net: phy: broadcom: add 1000Base-X support for BCM54616S

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Date:   Mon, 5 Aug 2019 06:38:16 +0000
From:   Tao Ren <taoren@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Vladimir Oltean <olteanv@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Arun Parameswaran <arun.parameswaran@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>,
        netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH net-next v3] net: phy: broadcom: add 1000Base-X support
 for BCM54616S

Hi Andrew,

On 8/4/19 7:51 AM, Andrew Lunn wrote:
>>> The patchset looks better now. But is it ok, I wonder, to keep
>>> PHY_BCM_FLAGS_MODE_1000BX in phydev->dev_flags, considering that
>>> phy_attach_direct is overwriting it?
>>
> 
>> I checked ftgmac100 driver (used on my machine) and it calls
>> phy_connect_direct which passes phydev->dev_flags when calling
>> phy_attach_direct: that explains why the flag is not cleared in my
>> case.
> 
> Yes, that is the way it is intended to be used. The MAC driver can
> pass flags to the PHY. It is a fragile API, since the MAC needs to
> know what PHY is being used, since the flags are driver specific.
> 
> One option would be to modify the assignment in phy_attach_direct() to
> OR in the flags passed to it with flags which are already in
> phydev->dev_flags.

It sounds like a reasonable fix/enhancement to replace overriding with OR, no matter which direction we are going to (either adding 1000bx aneg in genphy or providing phy-specific aneg callback).

Do you want me to send out the patch (I feel it's better to be in a separate patch?) or someone else will take care of it?


Thanks,

Tao