netdev - Re: [PATCH 1/2] net: phy: dp83867: enable robust auto-mdix

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Message-ID: <20191023153845.GB13748@lunn.ch>
Date:   Wed, 23 Oct 2019 17:38:45 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: phy: dp83867: enable robust auto-mdix

On Wed, Oct 23, 2019 at 05:48:45PM +0300, Grygorii Strashko wrote:
> The link detection timeouts can be observed (or link might not be detected
> at all) when dp83867 PHY is configured in manual mode (speed/duplexity).
> 
> CFG3[9] Robust Auto-MDIX option allows significantly improve link detection
> in case dp83867 is configured in manual mode and reduce link detection
> time.
> As per DM: "If link partners are configured to operational modes that are
> not supported by normal Auto MDI/MDIX mode (like Auto-Neg versus Force
> 100Base-TX or Force 100Base-TX versus Force 100Base-TX), this Robust Auto
> MDI/MDIX mode allows MDI/MDIX resolution and prevents deadlock."
> 
> Hence, enable this option by default as there are no known reasons
> not to do so.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew