linux-kernel - Re: [PATCH net-next v2 1/1] net: phy: dp83td510: add cable testing support

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Message-ID: <210b2feb-5a54-4c3a-8a85-8a61334153ce@lunn.ch>
Date: Fri, 12 Jul 2024 17:50:02 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	kernel@...gutronix.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/1] net: phy: dp83td510: add cable testing
 support

On Fri, Jul 12, 2024 at 05:28:48PM +0200, Oleksij Rempel wrote:
> This patch implements the TDR test procedure as described in
> "Application Note DP83TD510E Cable Diagnostics Toolkit revC", section 3.2.
> 
> The procedure was tested with "draka 08 signalkabel 2x0.8mm". The reported
> cable length was 5 meters more for each 20 meters of actual cable length.
> For instance, a 20-meter cable showed as 25 meters, and a 40-meter cable
> showed as 50 meters. Since other parts of the diagnostics provided by this
> PHY (e.g., Active Link Cable Diagnostics) require accurate cable
> characterization to provide proper results, this tuning can be implemented
> in a separate patch/interface.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> changes v2:
> - add comments
> - change post silence time to 1000ms

Nice comments, thanks.

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

    Andrew