netdev - Re: [PATCH net-next v8 08/11] net: stmmac: dwmac-loongson: Fix MAC speed for GNET

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Message-ID: <8d6eed68-0719-4a30-9278-6faea3174d23@loongson.cn>
Date: Wed, 27 Mar 2024 10:41:57 +0800
From: Yanteng Si <siyanteng@...ngson.cn>
To: Andrew Lunn <andrew@...n.ch>
Cc: Serge Semin <fancer.lancer@...il.com>, hkallweit1@...il.com,
 peppe.cavallaro@...com, alexandre.torgue@...s.st.com, joabreu@...opsys.com,
 Jose.Abreu@...opsys.com, chenhuacai@...ngson.cn, linux@...linux.org.uk,
 guyinggang@...ngson.cn, netdev@...r.kernel.org, chris.chenfeiyang@...il.com
Subject: Re: [PATCH net-next v8 08/11] net: stmmac: dwmac-loongson: Fix MAC
 speed for GNET


在 2024/3/26 20:21, Andrew Lunn 写道:
> On Tue, Mar 26, 2024 at 08:02:55PM +0800, Yanteng Si wrote:
>> 在 2024/3/21 23:02, Andrew Lunn 写道:
>>>> When switching speeds (from 100M to 1000M), the phy cannot output clocks,
>>>>
>>>> resulting in the unavailability of the network card.  At this time, a reset
>>>> of the
>>>>
>>>> phy is required.
>>> reset, or restart of autoneg?
>> reset.
> If you need a reset, why are you asking it to restart auto-neg?
Autoneg was discussed in patch v1, but we may have misunderstood the 
description from our hardware engineers at the time. The root cause is 
that there is an error in the connection between the MAC and PHY. After 
repeated tests, we have found that

auto-negcannot solve all problems and can only be reset. Thanks, Yanteng