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

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Message-ID: <12e86fbe-9515-4b81-951c-8bf86e2939d6@lunn.ch>
Date: Fri, 7 Feb 2025 14:32:28 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
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>,
	Mengyuan Lou <mengyuanlou@...-swift.com>,
	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,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v7 2/7] net: pcs: xpcs: re-initiate clause 37
 Auto-negotiation

> 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