From: Andrew Lunn <andrew@lunn.ch>
To: Yijie Yang <quic_yijiyang@quicinc.com>
Cc: Vinod Koul <vkoul@kernel.org>,
Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konradybcio@kernel.org>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Jose Abreu <joabreu@synopsys.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 0/3] Support tuning the RX sampling swap of the MAC.
Date: Wed, 25 Dec 2024 18:49:07 +0100 [thread overview]
Message-ID: <6dcfdb0b-c1ec-49f7-927e-531b20264d68@lunn.ch> (raw)
In-Reply-To: <20241225-support_10m100m-v1-0-4b52ef48b488@quicinc.com>
On Wed, Dec 25, 2024 at 06:04:44PM +0800, Yijie Yang wrote:
> The Ethernet MAC requires precise sampling times at Rx, but signals on the
> Rx side after transmission on the board may vary due to different hardware
> layouts. The RGMII_CONFIG2_RX_PROG_SWAP can be used to switch the sampling
> occasion between the rising edge and falling edge of the clock to meet the
> sampling requirements.
The RGMII specification says that RD[3:0] pins are sampled on the
rising edge for bits 3:0 and falling edge for bits 7:4.
Given this is part of the standard, why would you want to do anything
else?
Is this maybe another symptom of having the RGMII delays messed up?
Anyway, i don't see a need for this property, unless you are working
with a PHY which breaks the RGMII standard, and has its clock
reversed?
Andrew
next prev parent reply other threads:[~2024-12-25 17:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-25 10:04 Yijie Yang
2024-12-25 10:04 ` [PATCH 1/3] dt-bindings: net: stmmac: Tune rx sampling occasion Yijie Yang
2024-12-25 10:04 ` [PATCH 2/3] net: stmmac: qcom-ethqos: Enable RX programmable swap on qcs615 Yijie Yang
2024-12-25 11:37 ` Krzysztof Kozlowski
2024-12-26 2:29 ` Yijie Yang
2024-12-26 17:21 ` Andrew Lunn
2025-01-08 9:42 ` Yijie Yang
2025-01-08 13:29 ` Andrew Lunn
2025-01-20 9:07 ` Yijie Yang
2025-01-20 16:49 ` Andrew Lunn
2025-01-21 7:13 ` Yijie Yang
2025-01-21 14:34 ` Andrew Lunn
2024-12-27 7:03 ` Krzysztof Kozlowski
2025-01-08 10:33 ` Yijie Yang
2025-01-13 11:26 ` Krzysztof Kozlowski
2025-01-14 1:51 ` Yijie Yang
2024-12-25 10:04 ` [PATCH 3/3] arm64: dts: qcom: qcs615-ride: Enable RX programmable swap on qcs615-ride Yijie Yang
2024-12-25 17:38 ` Andrew Lunn
2024-12-26 1:23 ` Yijie Yang
2024-12-25 17:49 ` Andrew Lunn [this message]
2024-12-26 3:06 ` [PATCH 0/3] Support tuning the RX sampling swap of the MAC Yijie Yang
2024-12-26 17:14 ` Andrew Lunn
2025-01-08 10:43 ` Yijie Yang
2024-12-27 15:18 ` Rob Herring (Arm)
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