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Date:   Mon, 20 May 2019 02:33:02 +0200
From:   Andrew Lunn <andrew@lunn.ch>
To:     Oleksij Rempel <o.rempel@pengutronix.de>
Cc:     Paul Burton <paul.burton@mips.com>,
        Ralf Baechle <ralf@linux-mips.org>,
        James Hogan <jhogan@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Jay Cliburn <jcliburn@gmail.com>,
        Chris Snook <chris.snook@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Mark Rutland <mark.rutland@arm.com>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, John Crispin <john@phrozen.org>,
        Felix Fietkau <nbd@nbd.name>, netdev@vger.kernel.org,
        Chuanhong Guo <gch981213@gmail.com>,
        info@freifunk-bad-gandersheim.net
Subject: Re: [PATCH v4 3/3] net: ethernet: add ag71xx driver
Message-ID: <20190520003302.GA1695@lunn.ch>
References: <20190519080304.5811-1-o.rempel@pengutronix.de>
 <20190519080304.5811-4-o.rempel@pengutronix.de>
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Hi Oleksij

> +static int ag71xx_mdio_mii_read(struct mii_bus *bus, int addr, int reg)
> +{
> +	struct ag71xx *ag = bus->priv;
> +	struct net_device *ndev = ag->ndev;
> +	int err;
> +	int ret;
> +
> +	err = ag71xx_mdio_wait_busy(ag);
> +	if (err)
> +		return err;
> +
> +	ag71xx_wr(ag, AG71XX_REG_MII_CMD, MII_CMD_WRITE);

It looks like you have not removed this.

> +	ag71xx_wr(ag, AG71XX_REG_MII_ADDR,
> +			((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));
> +	ag71xx_wr(ag, AG71XX_REG_MII_CMD, MII_CMD_READ);
> +
> +	err = ag71xx_mdio_wait_busy(ag);
> +	if (err)
> +		return err;
> +
> +	ret = ag71xx_rr(ag, AG71XX_REG_MII_STATUS);
> +	/*
> +	 * ar9331 doc: bits 31:16 are reserved and must be must be written
> +	 * with zero.
> +	 */
> +	ret &= 0xffff;
> +	ag71xx_wr(ag, AG71XX_REG_MII_CMD, MII_CMD_WRITE);

Or this.

> +
> +	netif_dbg(ag, link, ndev, "mii_read: addr=%04x, reg=%04x, value=%04x\n",
> +		  addr, reg, ret);
> +
> +	return ret;
> +}
> +
> +static int ag71xx_mdio_mii_write(struct mii_bus *bus, int addr, int reg,
> +				 u16 val)
> +{
> +	struct ag71xx *ag = bus->priv;
> +	struct net_device *ndev = ag->ndev;
> +
> +	netif_dbg(ag, link, ndev, "mii_write: addr=%04x, reg=%04x, value=%04x\n",
> +		  addr, reg, val);
> +
> +	ag71xx_wr(ag, AG71XX_REG_MII_ADDR,
> +			((addr & 0xff) << MII_ADDR_SHIFT) | (reg & 0xff));

addr have the vale 0-31. So a mask of 0xff is a couple of bits too
big.

> +	ag71xx_wr(ag, AG71XX_REG_MII_CTRL, val);
> +
> +	return ag71xx_mdio_wait_busy(ag);
> +}

> +static void ag71xx_link_adjust(struct ag71xx *ag, bool update)
> +{
> +	struct net_device *ndev = ag->ndev;
> +	struct phy_device *phydev = ndev->phydev;
> +	u32 cfg2;
> +	u32 ifctl;
> +	u32 fifo5;
> +
> +	if (!phydev->link && update) {
> +		ag71xx_hw_stop(ag);
> +		netif_carrier_off(ag->ndev);

phylib will take care of the carrier for you.

       Andrew