From: Andrew Lunn <andrew@lunn.ch>
To: Krzysztof Kozlowski <krzk@kernel.org>
Cc: "Frank.Sae" <Frank.Sae@motor-comm.com>,
hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, robh@kernel.org,
krzk+dt@kernel.org, conor+dt@kernel.org, linux@armlinux.org.uk,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, yuanlai.cui@motor-comm.com,
hua.sun@motor-comm.com, xiaoyong.li@motor-comm.com,
suting.hu@motor-comm.com, jie.han@motor-comm.com
Subject: Re: [PATCH 1/2] dt-bindings: net: motorcomm: Add chip mode cfg
Date: Sat, 27 Jul 2024 13:07:10 +0200 [thread overview]
Message-ID: <830d0003-ac0b-427d-a793-8e42091c4ff2@lunn.ch> (raw)
In-Reply-To: <ac84b12f-ae91-4a2f-a5f7-88febd13911c@kernel.org>
On Sat, Jul 27, 2024 at 11:25:25AM +0200, Krzysztof Kozlowski wrote:
> On 27/07/2024 11:20, Frank.Sae wrote:
> > The motorcomm phy (yt8821) supports the ability to
> > config the chip mode of serdes.
> > The yt8821 serdes could be set to AUTO_BX2500_SGMII or
> > FORCE_BX2500.
> > In AUTO_BX2500_SGMII mode, SerDes
> > speed is determined by UTP, if UTP link up
> > at 2.5GBASE-T, SerDes will work as
> > 2500BASE-X, if UTP link up at
> > 1000BASE-T/100BASE-Tx/10BASE-T, SerDes will work
> > as SGMII.
> > In FORCE_BX2500, SerDes always works
> > as 2500BASE-X.
When the SERDES is forced to 2500BaseX, does it perform rate
adaptation? e.g. does it insert pause frames to slow down the MAC?
Maybe look at air_en8811h.c.
Andrew
next prev parent reply other threads:[~2024-07-27 11:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-27 9:20 [PATCH 1/2] dt-bindings: net: motorcomm: Add chip mode cfg Frank.Sae
2024-07-27 9:25 ` Krzysztof Kozlowski
2024-07-27 11:07 ` Andrew Lunn [this message]
2024-08-11 12:45 ` Frank.Sae
[not found] ` <f18fa949-b217-4373-82c4-7981872446b4@motor-comm.com>
2024-08-01 13:14 ` Andrew Lunn
2024-08-11 13:09 ` Frank.Sae
2024-08-01 14:23 ` Krzysztof Kozlowski
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