netdev - Re: [PATCH] net/fsl: quieten expected MDIO access failures

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Message-ID: <eafa77d6-4a00-f40e-a4fe-6b50736f3e03@arm.com>
Date:   Thu, 24 Sep 2020 10:40:24 -0500
From:   Jeremy Linton <jeremy.linton@....com>
To:     Jamie Iles <jamie@...iainc.com>, Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Calvin Johnson <calvin.johnson@....nxp.com>
Subject: Re: [PATCH] net/fsl: quieten expected MDIO access failures

Hi,

On 9/24/20 10:12 AM, Jamie Iles wrote:
> Hi Andrew,
> 
> On Thu, Sep 24, 2020 at 05:04:53PM +0200, Andrew Lunn wrote:
>> On Thu, Sep 24, 2020 at 03:56:45PM +0100, Jamie Iles wrote:
>>> MDIO reads can happen during PHY probing, and printing an error with
>>> dev_err can result in a large number of error messages during device
>>> probe.  On a platform with a serial console this can result in
>>> excessively long boot times in a way that looks like an infinite loop
>>> when multiple busses are present.  Since 0f183fd151c (net/fsl: enable
>>> extended scanning in xgmac_mdio) we perform more scanning so there are
>>> potentially more failures.
>>>
>>> Reduce the logging level to dev_dbg which is consistent with the
>>> Freescale enetc driver.
>>
>> Hi Jamie
>>
>> Does the system you are using suffer from Errata A011043?
> 
> It's the HoneyComb SolidRun (LX2160A) and I can't find an errata list
> for that chip.  It's booting from ACPI in any case so wouldn't have that
> workaround set.

I don't see those messages, but granted my firmware is a bit out of 
date. Let me upgrade it and see if I can reproduce it too.

(also +CC Calvin)