linux-kernel - Re: [PATCH] lan743x: Added fixed link and RGMII support / debugging

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Message-Id: <42337EA1-C7D1-46C6-815F-C619B27A4E77@berg-solutions.de>
Date:   Wed, 3 Jun 2020 18:33:28 +0200
From:   Roelof Berg <rberg@...g-solutions.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lan743x: Added fixed link and RGMII support / debugging

Ok, let's proceed :) The code runs well, dmesg looks good, ip addr shows me a link up, speed/duplex looks ok. But it does not transfer any data.

Debugging steps (A/B versions):
- Check clocks with oscilloscope (10/100/1000)
- Dump actual register settings
- Trace Phy-Phy autonegotiation and ensure that our patch catches up the result

Research topic:
I will also look if in my test hardware uses distinct MDIO traces or in-band MDIO (MDIO via MII). Would inband MDIO need the autosense feature to talk to the phy before phy-phy auto negotiation is complete ? E.g. for triggering phy-phy autoneg ? And is this (inband mdio) maybe the reason why the may-phy autosense feature exists in the silicon ?

Thanks,
Roelof

> Am 03.06.2020 um 17:59 schrieb Andrew Lunn <andrew@...n.ch>:
> 
> On Wed, Jun 03, 2020 at 04:52:32PM +0200, Roelof Berg wrote:
>> TEST REPORT: BROKEN PATCH
>> 
>> Thanks to everyone for working on the fixed link feature of lan743x eth driver.
>> 
> 
>> I received more test hardware today, and one piece of hardware
>> (EVBlan7430) becomes incompatible by the patch. We need to roll back
>> for now. Sorry.
> 
> Hi Roelof
> 
> We have a bit of time to fix this, before it becomes too critical.
> So lets try to fix it.
> 
> How did it break?
> 
>    Thanks
> 	Andrew
>