netdev - Re: [PATCH net-next 2/2] net: phy: marvell: implement cable-test for 88E308X/88E609X family

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Date: Wed, 27 Mar 2024 15:28:39 +0000
From: Simon Horman <horms@...nel.org>
To: Pawel Dembicki <paweldembicki@...il.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Stefan Eichenberger <eichest@...il.com>,
	Dimitri Fedrau <dima.fedrau@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 2/2] net: phy: marvell: implement cable-test for
 88E308X/88E609X family

On Tue, Mar 26, 2024 at 03:12:36PM +0100, Pawel Dembicki wrote:
> This commit implements VCT in 88E308X/88E609X Family.
> 
> It require two workarounds with some magic configuration.
> Regular use require only one register configuration. But Open Circuit
> require second workaround.
> It cause implementation two phases for fault length measuring.
> 
> Fast Ethernet PHY have implemented very simple version of VCT. It's
> complitley different than vct5 or vct7.
> 
> Signed-off-by: Pawel Dembicki <paweldembicki@...il.com>
> ---
>  drivers/net/phy/marvell.c | 252 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 252 insertions(+)
> 
> diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c

...

> +u32 m88e3082_vct_distrfln_2_cm(u8 distrfln)

nit: This function seems to only be used in this file.
     If so it should be static.

> +{
> +	if (distrfln < 24)
> +		return 0;
> +
> +	/* Original function for meters: y = 0.7861x - 18.862 */
> +	return (7861 * distrfln - 188620) / 100;
> +}

...