linux-kernel - Re: [PATCH net-next v3 4/6] net: phy: microchip

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Message-ID: <ZG+oOVWuKnwE0IB2@builder>
Date:   Thu, 25 May 2023 20:26:01 +0200
From:   Ramón Nordin Rodriguez 
        <ramon.nordin.rodriguez@...roamp.se>
To:     Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>
Cc:     andrew@...n.ch, hkallweit1@...il.com, linux@...linux.org.uk,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, horatiu.vultur@...rochip.com,
        Woojung.Huh@...rochip.com, Nicolas.Ferre@...rochip.com,
        Thorsten.Kummermehr@...rochip.com
Subject: Re: [PATCH net-next v3 4/6] net: phy: microchip_t1s: fix reset
 complete status handling

> +	/* Read STS2 register and check for the Reset Complete status to do the
> +	 * init configuration. If the Reset Complete is not set, wait for 5us
> +	 * and then read STS2 register again and check for Reset Complete status.
> +	 * Still if it is failed then declare PHY reset error or else proceed
> +	 * for the PHY initial register configuration.
> +	 */
> +	err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2);
> +	if (err < 0)
> +		return err;
> +
> +	if (!(err & LAN867x_RESET_COMPLETE_STS)) {
> +		udelay(5);
> +		err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2);
> +		if (err < 0)
> +			return err;
> +		if (!(err & LAN867x_RESET_COMPLETE_STS)) {
> +			phydev_err(phydev, "PHY reset failed\n");
> +			return -ENODEV;
> +		}
> +	}

This comment explains exactly what the code does, which is also obvious
from reading the code. A meaningful comment would be explaining why the
state can change 5us later.