netdev - Re: [PATCH net-next 4/4] net: phy: bcm54140: add cable diagnostics support

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Message-ID: <20200510144451.GJ362499@lunn.ch>
Date:   Sun, 10 May 2020 16:44:51 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michael Walle <michael@...le.cc>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 4/4] net: phy: bcm54140: add cable diagnostics
 support

On Sun, May 10, 2020 at 12:37:14AM +0200, Michael Walle wrote:
> Use the generic cable tester functions from bcm-phy-lib to add cable
> tester support.
> 
> 100m cable, A/B/C/D open:
>   Cable test started for device eth0.
>   Cable test completed for device eth0.
>   Pair: Pair A, result: Open Circuit
>   Pair: Pair B, result: Open Circuit
>   Pair: Pair C, result: Open Circuit
>   Pair: Pair D, result: Open Circuit
>   Pair: Pair A, fault length: 106.60m
>   Pair: Pair B, fault length: 103.32m
>   Pair: Pair C, fault length: 104.96m
>   Pair: Pair D, fault length: 106.60m
> 
> 1m cable, A/B connected, pair C shorted, D open:
>   Cable test started for device eth0.
>   Cable test completed for device eth0.
>   Pair: Pair A, result: OK
>   Pair: Pair B, result: OK
>   Pair: Pair C, result: Short within Pair
>   Pair: Pair D, result: Open Circuit
>   Pair: Pair C, fault length: 0.82m
>   Pair: Pair D, fault length: 1.64m
> 
> 1m cable, A/B connected, pair C shorted with D:
>   Cable test started for device eth0.
>   Cable test completed for device eth0.
>   Pair: Pair A, result: OK
>   Pair: Pair B, result: OK
>   Pair: Pair C, result: Short to another pair
>   Pair: Pair D, result: Short to another pair
>   Pair: Pair C, fault length: 1.64m
>   Pair: Pair D, fault length: 1.64m
> 
> The granularity of the length measurement seems to be 82cm.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>

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

    Andrew