linux-kernel - Re: [PATCH net-next 2/7] net: phy: mscc: add support for VSC8584 PHY

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Message-ID: <20181001091543.q4mshrpmbn7tlkdn@qschulz>
Date:   Mon, 1 Oct 2018 11:15:43 +0200
From:   Quentin Schulz <quentin.schulz@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     alexandre.belloni@...tlin.com, ralf@...ux-mips.org,
        paul.burton@...s.com, jhogan@...nel.org, robh+dt@...nel.org,
        mark.rutland@....com, davem@...emloft.net, f.fainelli@...il.com,
        allan.nielsen@...rochip.com, linux-mips@...ux-mips.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        antoine.tenart@...tlin.com
Subject: Re: [PATCH net-next 2/7] net: phy: mscc: add support for VSC8584 PHY

Hi Andrew,

On Fri, Sep 14, 2018 at 07:27:54PM +0200, Andrew Lunn wrote:
> 
> >  struct vsc8531_private {
> >  	int rate_magic;
> >  	u16 supp_led_modes;
> > @@ -181,6 +354,7 @@ struct vsc8531_private {
> >  	struct vsc85xx_hw_stat *hw_stats;
> >  	u64 *stats;
> >  	int nstats;
> > +	bool pkg_init;
> 
> > +/* bus->mdio_lock should be locked when using this function */
> > +static int vsc8584_cmd(struct mii_bus *bus, int phy, u16 val)
> > +{
> > +	unsigned long deadline;
> > +	u16 reg_val;
> > +
> > +	__mdiobus_write(bus, phy, MSCC_EXT_PAGE_ACCESS,
> > +			MSCC_PHY_PAGE_EXTENDED_GPIO);
> > +
> > +	__mdiobus_write(bus, phy, MSCC_PHY_PROC_CMD, PROC_CMD_NCOMPLETED | val);
> 
> Hi Quentin
> 
> All the __mdiobus_write() look a bit ugly.

I agree :)

> Maybe add bus and base_addr
> to the vsc8531_private structure. Then add helpers
> phy_write_base_phy(priv, reg, val) and phy_read_base_phy(priv, reg).
> 

ACK.

> You could also add in:
> 
>         if (unlikely(!mutex_is_locked(&priv->bus->mdio_lock))) {
>                 dev_err(bus->dev, "MDIO bus lock not held!\n");
>                 dump_stack();
>         }
> 
> Having such code in the mv88e6xxx driver has found a few bugs for me.
> 

ACK.

Thanks,
Quentin

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