linux-kernel - Re: [PATCH v6 net-next 09/14] net: phy: marvell-88q2xxx: add cable test support

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Date: Wed, 14 Feb 2024 18:54:58 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Dimitri Fedrau <dima.fedrau@...il.com>
Cc: 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>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 net-next 09/14] net: phy: marvell-88q2xxx: add cable
 test support

> +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;

That looks odd. Is there no status bit which says it has completed? Is
it guaranteed to complete within a fixed time? How is it guaranteed that
mv88q222x_cable_test_get_status() is called at the necessary delay after 
mv88q222x_cable_test_start()?

	Andrew