linux-kernel - Re: [PATCH v4 3/3] net: ethernet: add ag71xx driver

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Date:   Mon, 20 May 2019 09:05:26 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Jay Cliburn <jcliburn@...il.com>,
        Chris Snook <chris.snook@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Mark Rutland <mark.rutland@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, John Crispin <john@...ozen.org>,
        Felix Fietkau <nbd@....name>, netdev@...r.kernel.org,
        Chuanhong Guo <gch981213@...il.com>,
        info@...ifunk-bad-gandersheim.net
Subject: Re: [PATCH v4 3/3] net: ethernet: add ag71xx driver



On 20.05.19 02:33, Andrew Lunn wrote:
> 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.

done.

> 
>> +	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.

this one is needed. MII_CMD_WRITE is a wrong name, it is actually disabling MII_CMD_READ mode.

> 
>> +
>> +	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.

done

> 
>> +	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.

done

>         Andrew

thx!

Kind regards,
Oleksij Rempel

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