linux-kernel - Re: [PATCH net-next v7 2/7] net: pcs: xpcs: re-initiate clause 37 Auto-negotiation

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Message-ID: <be0689a5-2202-4231-9e97-49e9576236a2@linux.intel.com>
Date: Thu, 20 Feb 2025 10:12:14 +0800
From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: Simon Horman <horms@...nel.org>, Jose Abreu <joabreu@...opsys.com>,
 Jose Abreu <Jose.Abreu@...opsys.com>,
 David E Box <david.e.box@...ux.intel.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H . Peter Anvin" <hpa@...or.com>,
 Rajneesh Bhardwaj <irenic.rajneesh@...il.com>,
 David E Box <david.e.box@...el.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin
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 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
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 Serge Semin <fancer.lancer@...il.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
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Subject: Re: [PATCH net-next v7 2/7] net: pcs: xpcs: re-initiate clause 37
 Auto-negotiation

On 6/2/2025 11:30 pm, Russell King (Oracle) wrote:
> Also, if the reset is required, what happens if we're already using
> SGMII, but AN has been disabled temporarily and is then re-enabled?
> Is a reset required?
> 

Hi Russell,

When we use SGMII with XPCS, the AN is disabled and then re-enabled. This 
process does not involve any PCS configuration, so a reset is not required.

I tested it with stmmac (dwmac5) + xpcs + Marvell (88E1510) PHY, and it 
works fine when AN is temporarily disabled and then re-enabled without a reset.