linux-kernel - Re: [PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

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Message-ID: <6f0e1c34-d5d3-4ee5-9374-768e67a0c067@lunn.ch>
Date: Thu, 24 Oct 2024 01:56:31 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Inochi Amaoto <inochiama@...il.com>
Cc: Chen Wang <unicorn_wang@...look.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>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Inochi Amaoto <inochiama@...look.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Yixun Lan <dlan@...too.org>, netdev@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 4/4] net: stmmac: Add glue layer for Sophgo SG2044 SoC

On Thu, Oct 24, 2024 at 06:36:06AM +0800, Inochi Amaoto wrote:
> On Wed, Oct 23, 2024 at 02:42:16PM +0200, Andrew Lunn wrote:
> > > Yes, this is what I have done at the beginning. At first I only
> > > set up the phy setting and not set the config in the syscon. 
> > > But I got a weird thing: the phy lookback test is timeout. 
> > > Although the datasheet told it just adds a internal delay for 
> > > the phy, I suspect sophgo does something more to set this delay.
> > 
> > You need to understand what is going on here. Just because it works
> > does not mean it is correct.
> > 
> 
> It seems like there is a missing info in the SG2044 doc: setting the
> syscon internal delay bit is not enabling the internal mac delay, but
> disable it. Now everything seems like normal: the mac adds no delay,
> and the phy adds its delay. 

That makes a lot more sense.

Thanks for digging into the details.

	Andrew