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

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Message-ID: <71887246-d30f-4134-8c6d-b379477b2457@linux.intel.com>
Date: Sat, 8 Feb 2025 11:33:38 +0800
From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: "Russell King (Oracle)" <linux@...linux.org.uk>,
 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
 <mcoquelin.stm32@...il.com>, Alexandre Torgue
 <alexandre.torgue@...s.st.com>, Jiawen Wu <jiawenwu@...stnetic.com>,
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 Heiner Kallweit <hkallweit1@...il.com>, Hans de Goede <hdegoede@...hat.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Richard Cochran <richardcochran@...il.com>,
 Serge Semin <fancer.lancer@...il.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 platform-driver-x86@...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 7/2/2025 9:32 pm, Andrew Lunn wrote:
>> Good point. I cannot find this scenario in the datasheet. Please allow me
>> some time to test this scenario. I will update you with the results.
> 
> By data sheet, do you mean documentation from Synopsis, or is this an
> internal document? Assuming the hardware engineers have not hacked up
> the Synopsis IP too much, the Synopsis documentation is probably the
> most accurate you have.
> 
>>> What about 1000BASE-X when AN is enabled or disabled and then switching
>>> to SGMII?
>>>
>> According to the datasheet, a soft reset is required.
> 
> Do you know if this is specific to Intels integration of the Synopsis
> IP, or this is part of the core licensed IP?
> 
> We need to understand when we need a quirk because intel did something
> odd, or it is part of the licensed IP and should happen for all
> devices using the IP.
> 
> 	Andrew
> 

Hi Andrew,

Thank you for your questions. Just to clarify, when I mention the 
"datasheet," I am referring to the documentation from "Synopsis - 
DesignWare Cores Ethernet PCS" and not specific to Intel's documentation.