linux-kernel - Re: [PATCH v2 net-next] net: phy: at803x: remove at803x_aneg

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Message-ID: <cc948086f552146bf9ac07b372104138@walle.cc>
Date:   Thu, 18 Mar 2021 20:47:21 +0100
From:   Michael Walle <michael@...le.cc>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>
Subject: Re: [PATCH v2 net-next] net: phy: at803x: remove at803x_aneg_done()

Am 2021-03-18 20:44, schrieb Michael Walle:
> Here is what Vladimir says about it:
> 
>   at803x_aneg_done() keeps the aneg reporting as "not done" even when
>   the copper-side link was reported as up, but the in-band autoneg has
>   not finished.
> 
>   That was the _intended_ behavior when that code was introduced, and
>   Heiner have said about it [1]:
> 
>   | That's not nice from the PHY:
>   | It signals "link up", and if the system asks the PHY for link 
> details,
>   | then it sheepishly says "well, link is *almost* up".
> 
>   If the specification of phy_aneg_done behavior does not include
>   in-band autoneg (and it doesn't), then this piece of code does not
>   belong here.
> 
>   The fact that we can no longer trigger this code from phylib is yet
>   another reason why it fails at its intended (and wrong) purpose and
>   should be removed.
> 
> Removing the SGMII link check, would just keep the call to
> genphy_aneg_done(), which is also the fallback. Thus we can just remove
> at803x_aneg_done() altogether.
> 
> [1] 
> https://lore.kernel.org/netdev/fdf0074a-2572-5914-6f3e-77202cbf96de@gmail.com/
> 
> Suggested-by: Vladimir Oltean <olteanv@...il.com>
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---

Sorry forgot the version history:

Changes since v1:
  - more detailed commit message

-michael