Re: [PATCH v2 2/4] net: ethoc: don't advertise gigabit speed onattached PHY

[Max Filippov]

On Wed, Jan 29, 2014 at 10:47 AM, Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
> Hi Max,
>
> Le 28/01/2014 22:00, Max Filippov a Ãcrit :
>
>> 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>
>> ---
>> Changes v1->v2:
>> - disable both gigabit advertisement and support.
>>
>>   drivers/net/ethernet/ethoc.c | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
>> index 4de8cfd..5643b2d 100644
>> --- a/drivers/net/ethernet/ethoc.c
>> +++ b/drivers/net/ethernet/ethoc.c
>> @@ -688,6 +688,14 @@ static int ethoc_mdio_probe(struct net_device *dev)
>>         }
>>
>>         priv->phy = phy;
>> +       phy_update_advert(phy,
>> +                         ADVERTISED_1000baseT_Full |
>> +                         ADVERTISED_1000baseT_Half, 0);
>> +       phy_start_aneg(phy);
>
>
> This does not look necessary, you should not have to call phy_start_aneg()
> because the PHY state machine is not yet started, at best this calls does
> nothing.

This call actually makes the whole thing work, because otherwise once gigabit
support is cleared from the supported mask genphy_config_advert does not
update gigabit advertisement register, leaving it enabled.

>> +       phy_update_supported(phy,
>> +                            SUPPORTED_1000baseT_Full |
>> +                            SUPPORTED_1000baseT_Half, 0);
>> +
>>         return 0;
>>   }
>>
>>
>

-- 
Thanks.
-- Max
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/