netdev - Re: [PATCH net] net: phy: consider AN_RESTART status when reading link status

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Message-ID: <20190813195755.19570c51@cakuba.netronome.com>
Date:   Tue, 13 Aug 2019 19:57:55 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Yonglong Liu <liuyonglong@...wei.com>
Subject: Re: [PATCH net] net: phy: consider AN_RESTART status when reading
 link status

On Mon, 12 Aug 2019 21:20:02 +0200, Heiner Kallweit wrote:
> After configuring and restarting aneg we immediately try to read the
> link status. On some systems the PHY may not yet have cleared the
> "aneg complete" and "link up" bits, resulting in a false link-up
> signal. See [0] for a report.
> Clause 22 and 45 both require the PHY to keep the AN_RESTART
> bit set until the PHY actually starts auto-negotiation.
> Let's consider this in the generic functions for reading link status.
> The commit marked as fixed is the first one where the patch applies
> cleanly.

Queued for 5.1+, then.

> [0] https://marc.info/?t=156518400300003&r=1&w=2
> 
> Fixes: c1164bb1a631 ("net: phy: check PMAPMD link status only in genphy_c45_read_link")
> Tested-by: Yonglong Liu <liuyonglong@...wei.com>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>

Applied, thanks.