netdev - Re: Davicom DM9162 PHY supported in the kernel?

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Date:	Wed, 25 May 2016 15:00:24 +0100
From:	Amr Bekhit <amrbekhit@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Subject: Re: Davicom DM9162 PHY supported in the kernel?

Hi Andrew,

I've had another play around with the DTS and appear to have solved
the problem. I've changed the ethernet defintions from:

compatible = "cdns,at32ap7000-macb", "cdns,macb";

to

compatible = "cdns,at91sam9260-macb";

and everything seems to work fine now - I can finally send pings.

The reason I never suspected the dts is because the dts file comes
from the manufacturer provided software package, and in their package
the ethernet works fine, so I never suspected it.

Anyway, thanks for all your help, I appreciate it.

On 25 May 2016 at 14:20, Amr Bekhit <amrbekhit@...il.com> wrote:
> Hi Andrew,
>
> I've uploaded the device tree to http://pastebin.com/tNp2PnW4.
>
> On 25 May 2016 at 13:39, Andrew Lunn <andrew@...n.ch> wrote:
>> On Wed, May 25, 2016 at 11:28:37AM +0100, Amr Bekhit wrote:
>>> Hi Andrew,
>>>
>>> I added the following line to genphy_read_status to print out the value of BMCR:
>>>
>>>  phydev->lp_advertising = 0;
>>>
>>> +printk(KERN_DEBUG "MII_BMCR: 0x%04X\n", phy_read(phydev, MII_BMCR));
>>>
>>>  if (AUTONEG_ENABLE == phydev->autoneg) {
>>>
>>> After booting up the kernel and running ifconfig eth0 up, I get the
>>> following in kernel log:
>>>
>>> [   83.890625] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
>>> [   85.328125] MII_BMCR: 0x1000
>>> [   86.328125] MII_BMCR: 0x1000
>>> [   87.328125] MII_BMCR: 0x3100
>>> [   87.328125] macb f802c000.ethernet eth0: link up (100/Full)
>>> [   87.328125] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
>>> [   88.328125] MII_BMCR: 0x3100
>>> [   89.328125] MII_BMCR: 0x3100
>>> [   90.328125] MII_BMCR: 0x3100
>>>
>>> So it appears that after bringing the interface up, the PHY is
>>> configured for 100Mbps, autoneg enabled and duplex mode. The PHY is
>>> not isolated or powered down.
>>
>> So this all looks good. So it suggests your problem is between the MAC
>> and the PHY, since the PHY is able to talk to the PHY on the other end
>> of the cable.
>>
>> What do you have in device tree?
>>
>>      Andrew