Re: [PATCH 1/3] net: ethoc: don't advertise gigabit speed on attachedPHY

[Max Filippov]

Hi Ben,

On Mon, Jan 27, 2014 at 2:18 PM, Ben Hutchings <ben@xxxxxxxxxxxxxxx> wrote:
> On Mon, 2014-01-27 at 07:59 +0400, Max Filippov wrote:
>> OpenCores 10/100 Mbps MAC does not support speeds above 100 Mbps, but does
>> not disable advertisement when PHY supports them. This results in
>> non-functioning network when the MAC is connected to a gigabit PHY connected
>> to a gigabit switch.
>>
>> The fix is to disable gigabit speed advertisement on attached PHY
>> unconditionally.
>>
>> Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
>> ---
>>  drivers/net/ethernet/ethoc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
>> index 4de8cfd..0aa1a05 100644
>> --- a/drivers/net/ethernet/ethoc.c
>> +++ b/drivers/net/ethernet/ethoc.c
>> @@ -712,6 +712,8 @@ static int ethoc_open(struct net_device *dev)
>>               netif_start_queue(dev);
>>       }
>>
>> +     priv->phy->advertising &= ~(ADVERTISED_1000baseT_Full |
>> +                                 ADVERTISED_1000baseT_Half);
>>       phy_start(priv->phy);
>>       napi_enable(&priv->napi);
>>
>
> This is not sufficient to disable gigabit speeds; the supported mask
> should also be limited.  And it should be done even before the net

I tried that, but when I also limit supported mask the phy driver doesn't
touch gigabit advertising register int the genphy_config_advert at all.
That's probably right for ethtool interface, but ethoc doesn't support
ethtool.

> device is registered.
>
> Rather than poking into the phy_device structure directly from this
> driver, I think you should add a function in phylib for this purpose.

Like below?

---8<---