netdev - Re: [PATCH v5 net-next 09/13] net: phy: marvell-88q2xxx: add cable test support

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Message-ID: <Zbi/In/qWrW1qmP0@shell.armlinux.org.uk>
Date: Tue, 30 Jan 2024 09:19:30 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Dimitri Fedrau <dima.fedrau@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, 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>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 net-next 09/13] net: phy: marvell-88q2xxx: add cable
 test support

On Mon, Jan 22, 2024 at 10:28:42PM +0100, Dimitri Fedrau wrote:
> +static int mv88q222x_cable_test_get_status(struct phy_device *phydev,
> +					   bool *finished)
> +{
> +	int ret;
> +	u32 dist;
> +
> +	ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_MMD_PCS_MV_TDR_STATUS);
> +	if (ret < 0)
> +		return ret;
> +
> +	*finished = true;
> +	/* fault length in meters */
> +	dist = ((ret & MDIO_MMD_PCS_MV_TDR_STATUS_DIST_MASK) >>
> +		MDIO_MMD_PCS_MV_TDR_STATUS_DIST_SHIFT) * 100;

	dist = FIELD_GET(MDIO_MMD_PCS_MV_TDR_STATUS_DIST_MASK, ret) * 100;


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