netdev - Re: [PATCH net-next] net: phy: microchip_t1: add cable test support for lan87xx phy

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Date:   Fri, 22 Oct 2021 21:56:42 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Yuiko Oshino <yuiko.oshino@...rochip.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        nisar.sayed@...rochip.com, UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH net-next] net: phy: microchip_t1: add cable test support
 for lan87xx phy

> +static int lan87xx_cable_test_start(struct phy_device *phydev)
> +{
> +	static const struct access_ereg_val cable_test[] = {
> +		/* min wait */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 93,
> +		 0, 0},
> +		/* max wait */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 94,
> +		 10, 0},
> +		/* pulse cycle */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 95,
> +		 90, 0},
> +		/* cable diag thresh */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 92,
> +		 60, 0},
> +		/* max gain */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 79,
> +		 31, 0},
> +		/* clock align for each iteration */
> +		{PHYACC_ATTR_MODE_MODIFY, PHYACC_ATTR_BANK_DSP, 55,
> +		 0, 0x0038},
> +		/* max cycle wait config */
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 94,
> +		 70, 0},
> +		/* start cable diag*/
> +		{PHYACC_ATTR_MODE_WRITE, PHYACC_ATTR_BANK_DSP, 90,
> +		 1, 0},
> +	};
> +	int rc, i;
> +
> +	rc = microchip_cable_test_start_common(phydev);
> +	if (rc < 0)
> +		return rc;
> +
> +	/* start cable diag */
> +	/* check if part is alive - if not, return diagnostic error */
> +	rc = access_ereg(phydev, PHYACC_ATTR_MODE_READ, PHYACC_ATTR_BANK_SMI,
> +			 0x00, 0);
> +	if (rc < 0)
> +		return rc;
> +
> +	if (rc != 0x2100)
> +		return -ENODEV;

What does this actually mean? Would -EOPNOTSUPP be better?

> +static int lan87xx_cable_test_report_trans(u32 result)
> +{
> +	switch (result) {
> +	case 0:
> +		return ETHTOOL_A_CABLE_RESULT_CODE_OK;
> +	case 1:
> +		return ETHTOOL_A_CABLE_RESULT_CODE_OPEN;
> +	case 2:
> +		return ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT;

Please add some #defines for 0, 1, 2.

       Andrew