linux-kernel - Re: [PATCH net 4/4] net: bcmgenet: reset 40nm EPHY on energy detect

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Message-ID: <dfd439ee-8296-93d8-d007-631e8a232a88@gmail.com>
Date:   Wed, 16 Oct 2019 20:56:40 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Doug Berger <opendmb@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 4/4] net: bcmgenet: reset 40nm EPHY on energy detect



On 10/16/2019 4:06 PM, Doug Berger wrote:
> The EPHY integrated into the 40nm Set-Top Box devices can falsely
> detect energy when connected to a disabled peer interface. When the
> peer interface is enabled the EPHY will detect and report the link
> as active, but on occasion may get into a state where it is not
> able to exchange data with the connected GENET MAC. This issue has
> not been observed when the link parameters are auto-negotiated;
> however, it has been observed with a manually configured link.
> 
> It has been empirically determined that issuing a soft reset to the
> EPHY when energy is detected prevents it from getting into this bad
> state.
> 
> Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
> Signed-off-by: Doug Berger <opendmb@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian