linux-kernel - Re: [PATCH net-next 1/7] net: korina: Fix MDIO functions

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Message-ID: <YHdEJGhQlAVkSwWW@lunn.ch>
Date:   Wed, 14 Apr 2021 21:36:04 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/7] net: korina: Fix MDIO functions

> +static int korina_mdio_wait(struct korina_private *lp)
> +{
> +	int timeout = 1000;
> +
> +	while ((readl(&lp->eth_regs->miimind) & 1) && timeout-- > 0)
> +		udelay(1);
> +
> +	if (timeout <= 0)
> +		return -1;
> +
> +	return 0;

Using readl_poll_timeout_atomic() would be better.


> +}
> +
> +static int korina_mdio_read(struct net_device *dev, int phy, int reg)
>  {
>  	struct korina_private *lp = netdev_priv(dev);
>  	int ret;
>  
> -	mii_id = ((lp->rx_irq == 0x2c ? 1 : 0) << 8);
> +	if (korina_mdio_wait(lp))
> +		return -1;

This should really be -ETIMEDOUT

>  	dev->watchdog_timeo = TX_TIMEOUT;
>  	netif_napi_add(dev, &lp->napi, korina_poll, NAPI_POLL_WEIGHT);
>  
> -	lp->phy_addr = (((lp->rx_irq == 0x2c? 1:0) << 8) | 0x05);
>  	lp->mii_if.dev = dev;
> -	lp->mii_if.mdio_read = mdio_read;
> -	lp->mii_if.mdio_write = mdio_write;
> -	lp->mii_if.phy_id = lp->phy_addr;
> +	lp->mii_if.mdio_read = korina_mdio_read;
> +	lp->mii_if.mdio_write = korina_mdio_write;
> +	lp->mii_if.phy_id = 1;
>  	lp->mii_if.phy_id_mask = 0x1f;
>  	lp->mii_if.reg_num_mask = 0x1f;

You could also replace all the mii code with phylib.

    Andrew