netdev - Re: [PATCH v3 1/9] net: phy: new Asix Electronics PHY driver

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Date:   Thu, 19 Apr 2018 10:26:14 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev <netdev@...r.kernel.org>,
        Finn Thain <fthain@...egraphics.com.au>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Michael Karcher <Michael.Karcher@...berlin.de>
Subject: Re: [PATCH v3 1/9] net: phy: new Asix Electronics PHY driver

Hi Andrew,

I agree, that's much better. I had something like that in mind before
I got distracted...

/me looking for brown paper bag now.

Cheers,

  Michael


On Thu, Apr 19, 2018 at 12:13 AM, Andrew Lunn <andrew@...n.ch> wrote:
>> +
>> +/**
>> + * asix_soft_reset - software reset the PHY via BMCR_RESET bit
>> + * @phydev: target phy_device struct
>> + *
>> + * Description: Perform a software PHY reset using the standard
>> + * BMCR_RESET bit and poll for the reset bit to be cleared.
>> + * Toggle BMCR_RESET bit off to accomodate broken PHY implementations
>> + * such as used on the Individual Computers' X-Surf 100 Zorro card.
>> + *
>> + * Returns: 0 on success, < 0 on failure
>> + */
>> +static int asix_soft_reset(struct phy_device *phydev)
>> +{
>> +     int ret;
>> +
>> +     /* Asix PHY won't reset unless reset bit toggles */
>> +     ret = phy_write(phydev, MII_BMCR, 0);
>> +     if (ret < 0)
>> +             return ret;
>> +
>> +     phy_write(phydev, MII_BMCR, BMCR_RESET);
>> +
>> +     return phy_poll_reset(phydev);
>> +}
>
> Why not simply:
>
> static int asix_soft_reset(struct phy_device *phydev)
> {
>         int ret;
>
>         /* Asix PHY won't reset unless reset bit toggles */
>         ret = phy_write(phydev, MII_BMCR, 0);
>         if (ret < 0)
>                 return ret;
>
>         return genphy_soft_reset(phydev);
> }
>
>         Andrew
> --
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