netdev - Re: [PATCH] net: bcmgenet: Fix EPHY reset in power up

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Message-Id: <5A71930B-ED19-4690-942D-779F1454C77A@gmail.com>
Date:   Sat, 24 Sep 2016 00:04:22 +0900
From:   Jaedon Shin <jaedon.shin@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>,
        Philippe Reynes <tremyfr@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: bcmgenet: Fix EPHY reset in power up

Hi Andrew,

On 23 Sep 2016, at 11:06 PM, Andrew Lunn <andrew@...n.ch> wrote:
> 
> On Fri, Sep 23, 2016 at 10:20:04PM +0900, Jaedon Shin wrote:
>> The bcmgenet_mii_reset() is always not running in power up sequence
>> after 'commit 62469c76007e ("net: ethernet: bcmgenet: use phydev from
>> struct net_device")'. This'll show extremely high latency and duplicate
>> packets while interface down and up repeatedly.
>> 
>> For now, adds again a private phydev for mii reset when runs power up to
>> open interface.
> 
> Hi Jaedon
> 
> How does this fix the issue? It sounds like you are papering over the
> crack, not truly fixing it.
> 
>       Andrew

Yes, It feel like a workaround, but I think it must need v4.8 stable
version. If we find better way that fixes internal PHY to initialize
after re-open interface, this patch will be dropped.

Additionally,
http://www.spinics.net/lists/netdev/msg350506.html

Thanks,
Jaedon