netdev - Re: [PATCH] net: phy: realtek: Add RTL8224 cable testing support

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Message-ID: <3b1d35d7-ed62-4351-9e94-28e614d7f763@lunn.ch>
Date: Mon, 27 Oct 2025 01:16:12 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Sven Eckelmann <se@...onwunderlich.de>
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>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	sw@...onwunderlich.de, Issam Hamdi <ih@...onwunderlich.de>
Subject: Re: [PATCH] net: phy: realtek: Add RTL8224 cable testing support

> +#define RTL8224_SRAM_RTCT_FAULT_BUSY		BIT(0)
> +#define RTL8224_SRAM_RTCT_FAULT_OPEN		BIT(3)
> +#define RTL8224_SRAM_RTCT_FAULT_SAME_SHORT	BIT(4)
> +#define RTL8224_SRAM_RTCT_FAULT_OK		BIT(5)
> +#define RTL8224_SRAM_RTCT_FAULT_DONE		BIT(6)
> +#define RTL8224_SRAM_RTCT_FAULT_CROSS_SHORT	BIT(7)

It is unusual these are bits. Does the datasheet say what happens if
the cable is both same short and cross short?

> +static int rtl8224_cable_test_result_trans(u32 result)
> +{
> +	if (result & RTL8224_SRAM_RTCT_FAULT_SAME_SHORT)
> +		return ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT;
> +
> +	if (result & RTL8224_SRAM_RTCT_FAULT_BUSY)
> +		return ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC;
> +
> +	if (result & RTL8224_SRAM_RTCT_FAULT_CROSS_SHORT)
> +		return ETHTOOL_A_CABLE_RESULT_CODE_CROSS_SHORT;

I don't remember seeing a PHY able to report both same short and cross
short at the same time. Maybe there has been, but there is no code for
it. We could add such a code.

	Andrew