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Date:	Tue, 14 Oct 2014 12:09:59 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Angelo Dureghello <angelo70@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Fwd: micrel: ksz8051 badly detected as ksz8031

On 10/14/2014 10:24 AM, Angelo Dureghello wrote:
> Dear,
> 
> have to apologize for the confusion, previous patch is not the proper fix,
> since it is not solving completely the issue.
> 
> And also, i mainly misunderstood the issue.
> 
> The issue i am experiencing is :
> 
> https://lkml.org/lkml/2013/9/18/259
> 
> Mainly, i have Micrel chip marked KSZ8051(RNL), but the product Id in the
> silicon is KSZ8031 and linux detects it as KSZ8031.
> The attmept to mdio boot override register kill the Micrel functionality.

Ok, so basically your bootloader does something that Linux does, and
once Linux boots, it will reset the PHY to put it in a known state. If
you can snoop the MDIO read/writes done in your bootloader environment,
that might help narrow down the issue.

> 
> So i just replaced the phy_id code (hardcoded) in the code mdio detecion
> routine.

According to the link you posted above, the problem is that two
different PHY chips have the PHY ID, so why would you need to hardcode
the detection here?

> 
> Also, i am not giving to the Micrel any external 50Mhz clock, but
> as per default, the Micrel is giving the clock out to the davinci-emac.
> So no fixups are needed for my case.
> 
> But i still have a last issue now: i see link is up 100Mbit, but no
> packets are really sent, and nothing is received.
> Led links are up.

Do you have access to the Ethernet MAC counters using 'ethtool -S'? That
might tell you whether the problem is between the MAC and PHY, or at the
PHY level. If the PHY maintain its own set of counters (fairly unlikely)
can you try reading those and see if that works?

What about pinmux settings, Ethernet MAC settings etc... are they all
correct? Is there any Ethernet MAC back-pressure mechanism that can be
read to know whether the DMA engine is stuck transmitting?

Thanks

> 
> Time zone set
> Starting network...
> davinci_mdio davinci_mdio.0: resetting idled controller
> net eth0: attached PHY driver [Micrel KSZ8051]
> (mii_bus:phy_addr=davinci_mdio-0:00, id=221550)
> udhcpc (v1.20.2) started
> Sending discover...
> davinci_emac davinci_emac.1 eth0: Link is Up - 100Mbps/Full - flow
> control off
> Sending discover...
> Sending discover...
> No lease, failing
> ....
> 
> 
> [root@...ix ~]# ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:08:E1:03:2A:C5
>           inet6 addr: fe80::208:e1ff:fe03:2ac5/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:2258 (2.2 KiB)
>           Interrupt:33
> 
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
> 
> Packets seems sent but they are not sent at all (checking from WS)
> and no packets are received at the same time.
> 
> Reagrds,
> Angelo
> 
> 
> 
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