linux-kernel - Re: [PATCH] net: phy: adin: add signal mean square error registers to phy-stats

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Date:   Thu, 3 Dec 2020 15:16:18 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Alexandru Ardelean <alexandru.ardelean@...log.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, catherine.redmond@...log.com,
        brian.murray@...log.com, danail.baylov@...log.com,
        maurice.obrien@...log.com
Subject: Re: [PATCH] net: phy: adin: add signal mean square error registers
 to phy-stats

On Thu, Dec 03, 2020 at 10:07:19AM +0200, Alexandru Ardelean wrote:
> When the link is up on the ADIN1300/ADIN1200, the signal quality on each
> pair is indicated in the mean square error register for each pair (MSE_A,
> MSE_B, MSE_C, and MSE_D registers, Address 0x8402 to Address 0x8405,
> Bits[7:0]).
> 
> These values can be useful for some industrial applications.
> 
> This change implements support for these registers using the PHY
> statistics mechanism.

There was a discussion about values like these before. If i remember
correctly, it was for a BroadReach PHY. I thought we decided to add
them to the link state information?

Ah, found it.

commit 68ff5e14759e7ac1aac7bc75ac5b935e390fa2b3
Author: Oleksij Rempel <linux@...pel-privat.de>
Date:   Wed May 20 08:29:15 2020 +0200

    net: phy: tja11xx: add SQI support

and

ommit 8066021915924f58ed338bf38208215f5a7355f6
Author: Oleksij Rempel <linux@...pel-privat.de>
Date:   Wed May 20 08:29:14 2020 +0200

    ethtool: provide UAPI for PHY Signal Quality Index (SQI)

Can you convert your MSE into SQI?

    Andrew