netdev - Re: [PATCH v3] net: phy: micrel: ksz9031/ksz9131: add cabletest support

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Date:   Thu, 7 Apr 2022 13:48:28 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Vasut <marex@...x.de>
Cc:     netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH v3] net: phy: micrel: ksz9031/ksz9131: add cabletest
 support

On Thu, Apr 07, 2022 at 12:55:34PM +0200, Marek Vasut wrote:
> Add cable test support for Micrel KSZ9x31 PHYs.
> 
> Tested on i.MX8M Mini with KSZ9131RNX in 100/Full mode with pairs shuffled
> before magnetics:
> (note: Cable test started/completed messages are omitted)
> 
>   mx8mm-ksz9131-a-d-connected$ ethtool --cable-test eth0
>   Pair A code OK
>   Pair B code Short within Pair
>   Pair B, fault length: 0.80m
>   Pair C code Short within Pair
>   Pair C, fault length: 0.80m
>   Pair D code OK
> 
>   mx8mm-ksz9131-a-b-connected$ ethtool --cable-test eth0
>   Pair A code OK
>   Pair B code OK
>   Pair C code Short within Pair
>   Pair C, fault length: 0.00m
>   Pair D code Short within Pair
>   Pair D, fault length: 0.00m
> 
> Tested on R8A77951 Salvator-XS with KSZ9031RNX and all four pairs connected:
> (note: Cable test started/completed messages are omitted)
> 
>   r8a7795-ksz9031-all-connected$ ethtool --cable-test eth0
>   Pair A code OK
>   Pair B code OK
>   Pair C code OK
>   Pair D code OK
> 
> The CTRL1000 CTL1000_ENABLE_MASTER and CTL1000_AS_MASTER bits are not
> restored by calling phy_init_hw(), they must be manually cached in
> ksz9x31_cable_test_start() and restored at the end of
> ksz9x31_cable_test_get_status().
> 
> Signed-off-by: Marek Vasut <marex@...x.de>

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

    Andrew