netdev - Re: [PATCH v2 3/4] net: stmmac: Add glue layer for Loongson-1 SoC

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Date: Wed, 23 Aug 2023 10:47:53 +0800
From: Keguang Zhang <keguang.zhang@...il.com>
To: Andrew Lunn <andrew@...n.ch>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	"David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Giuseppe Cavallaro <peppe.cavallaro@...com>, 
	Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, 
	Serge Semin <Sergey.Semin@...kalelectronics.ru>
Subject: Re: [PATCH v2 3/4] net: stmmac: Add glue layer for Loongson-1 SoC

On Tue, Aug 22, 2023 at 11:20 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> > > What about the other three RGMII modes? Plain rgmii is pretty unusual,
> > > rgmii-id is the most used.
> > >
> > According to the LS1B datasheet, only RGMII and MII are supported.
> > And I can confirm that MII mode does work for LS1B.
>
> What does your device tree look like? What are you setting phy-mode to
> in the rgmii case? As i said, "rgmii" is pretty unusual, you normally
> need "rgmii-id".
>
> Something in the system needs to add 2ns delays to the RGMII clock
> lines. Generally in device tree you pass phy-mode = "rgmii-id"; The
> MAC configures itself for RGMII, and passes
> PHY_INTERFACE_MODE_RGMII_ID to the PHY when it is attached. The PHY
> then inserts the delays.
>
> What is inserting the delays in your system?
>
I understand the delay issue of RGMII.
Just tried phy-mode = "rgmii-id", it still works.
I will use PHY_INTERFACE_MODE_RGMII_ID instead.
Thanks!

>      Andrew
>


-- 
Best regards,

Keguang Zhang