netdev - Re: [RFC PATCH 10/10] net: stmmac: dwmac-loongson: Add GNET support

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Date: Fri, 14 Jul 2023 09:52:17 +0100
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>
Cc: Feiyang Chen <chris.chenfeiyang@...il.com>,
	Feiyang Chen <chenfeiyang@...ngson.cn>, hkallweit1@...il.com,
	peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
	joabreu@...opsys.com, chenhuacai@...ngson.cn, dongbiao@...ngson.cn,
	loongson-kernel@...ts.loongnix.cn, netdev@...r.kernel.org,
	loongarch@...ts.linux.dev
Subject: Re: [RFC PATCH 10/10] net: stmmac: dwmac-loongson: Add GNET support

On Fri, Jul 14, 2023 at 06:26:14AM +0200, Andrew Lunn wrote:
> On Fri, Jul 14, 2023 at 10:24:37AM +0800, Feiyang Chen wrote:
> > On Thu, Jul 13, 2023 at 12:07 PM Andrew Lunn <andrew@...n.ch> wrote:
> > >
> > > On Thu, Jul 13, 2023 at 10:49:38AM +0800, Feiyang Chen wrote:
> > > > Add GNET support. Use the fix_mac_speed() callback to workaround
> > > > issues with the Loongson PHY.
> > >
> > > What are the issues?
> > >
> > 
> > Hi, Andrew,
> > 
> > There is an issue with the synchronization between the network card
> > and the PHY. In the case of gigabit operation, if the PHY's speed
> > changes, the network card's speed remains unaffected. Hence, it is
> > necessary to initiate a re-negotiation process with the PHY to align
> > the link speeds properly.
> 
> When the line side speed changes, the PHY will first report link down
> via the adjust_link callback in the MAC driver. Once the PHY has
> determined the new speed, the adjust_link callback will be called
> again with the new speed and pause parameters.

Or in the case of stmmac, phylink is involved, so .mac_link_down will
get called and then .mac_link_up with the new parameters.

-- 
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