linux-kernel - Re: [PATCH] net: phy: micrel: ksz9031: reconfigure autoneg after phy autoneg workaround

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Message-Id: <20171226.122743.1534786850925610235.davem@davemloft.net>
Date:   Tue, 26 Dec 2017 12:27:43 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     grygorii.strashko@...com
Cc:     f.fainelli@...il.com, andrew@...n.ch, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, nsekhar@...com
Subject: Re: [PATCH] net: phy: micrel: ksz9031: reconfigure autoneg after
 phy autoneg workaround

From: Grygorii Strashko <grygorii.strashko@...com>
Date: Wed, 20 Dec 2017 18:45:10 -0600

> Under some circumstances driver will perform PHY reset in
> ksz9031_read_status() to fix autoneg failure case (idle error count =
> 0xFF). When this happens ksz9031 will not detect link status change any
> more when connecting to Netgear 1G switch (link can be recovered sometimes by
> restarting netdevice "ifconfig down up"). Reproduced with TI am572x board
> equipped with ksz9031 PHY while connecting to Netgear 1G switch.
> 
> Fix the issue by reconfiguring autonegotiation after PHY reset in
> ksz9031_read_status().
> 
> Fixes: d2fd719bcb0e ("net/phy: micrel: Add workaround for bad autoneg")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Applied and queued up for -stable.