netdev - Re: [PATCH 08/10] net: ax88796: Make reset more robust on AX88796B

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Date:   Tue, 17 Apr 2018 12:14:50 +1200
From:   Michael Schmitz <schmitzmic@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Michael Karcher <Michael.Karcher@...berlin.de>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
Subject: Re: [PATCH 08/10] net: ax88796: Make reset more robust on AX88796B

Hi Andrew,

On Tue, Apr 17, 2018 at 11:12 AM, Andrew Lunn <andrew@...n.ch> wrote:
> On Tue, Apr 17, 2018 at 10:04:43AM +1200, Michael Schmitz wrote:
>> From: John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
>>
>> The AX88796B as installed on the X-Surf-100 does not recognize a MII reset
>> request if the previous write to the MII control register also was a reset
>> request. So a dummy write to the control register makes the soft reset in
>> the PHY initialization code work.
>>
>> Signed-off-by: Michael Karcher <kernel@...rcher.dialup.fu-berlin.de>
>> ---
>>  drivers/net/ethernet/8390/ax88796.c |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/8390/ax88796.c b/drivers/net/ethernet/8390/ax88796.c
>> index 6af9aca..a2f9a09 100644
>> --- a/drivers/net/ethernet/8390/ax88796.c
>> +++ b/drivers/net/ethernet/8390/ax88796.c
>> @@ -374,6 +374,10 @@ static int ax_mii_probe(struct net_device *dev)
>>               return -ENODEV;
>>       }
>>
>> +     /* write a non-reset pattern to the control register to
>> +      * re-arm the reset request detection logic (needed on AX88796B)
>> +      */
>> +     phy_write(phy_dev, MII_BMCR, 0);
>
> This should really be fixed in the PHY driver, not the MAC.

OK - do you want this separate, or as part of this series? Might have
a few side effects on more commonly used hardware, perhaps?

Cheers,

  Michael

>
>      Andrew