linux-kernel - Re: [PATCH net-next v1 3/9] net: dsa: qca: ar9331: reorder MDIO write sequence

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Message-ID: <YGiB88Z7zc2h+e6u@lunn.ch>
Date:   Sat, 3 Apr 2021 16:55:47 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH net-next v1 3/9] net: dsa: qca: ar9331: reorder MDIO
 write sequence

Hi Oleksij

Maybe add a short comment about why the order is important.

> -	ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg, val);
> +	ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg + 2,
> +				  val >> 16);
>  	if (ret < 0)
>  		goto error;
>  
> -	ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg + 2,
> -				  val >> 16);
> +	ret = __ar9331_mdio_write(sbus, AR9331_SW_MDIO_PHY_MODE_REG, reg, val);
>  	if (ret < 0)
>  		goto error;
>  
>  	return 0;
> +
>  error:
>  	dev_err_ratelimited(&sbus->dev, "Bus error. Failed to write register.\n");
>  	return ret;

With that:

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew





> -- 
> 2.29.2
>