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[2003:f1:373a:1900:428d:5cff:feb9:9db8]) by smtp.googlemail.com with ESMTPSA id q3sm32911665wrn.33.2019.12.26.12.37.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Dec 2019 12:37:10 -0800 (PST) From: Martin Blumenstingl To: andrew@lunn.ch, f.fainelli@gmail.com, linux-amlogic@lists.infradead.org, jianxin.pan@amlogic.com Subject: [RFC v1 0/2] dwmac-meson8b Ethernet RX delay configuration Date: Thu, 26 Dec 2019 21:36:53 +0100 Message-Id: <20191226203655.4046170-1-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191226_123713_704825_7021FE09 X-CRM114-Status: UNSURE ( 8.81 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:343 listed in] [list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (martin.blumenstingl[at]googlemail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Blumenstingl , netdev@vger.kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The Ethernet TX performance has been historically bad on Meson8b and Meson8m2 SoCs because high packet loss was seen. I found out that this was related (yet again) to the RGMII TX delay configuration. In the process of discussing the big picture (and not just a single patch) [0] with Andrew I discovered that the IP block behind the dwmac-meson8b driver actually seems to support the configuration of the RGMII RX delay (at least on the Meson8b SoC generation). The goal of this series is to start the discussion around how to implement the RGMII RX delay on this IP block. Additionally it seems that the RX delay can also be applied for RMII PHYs? @Jianxin: can you please add the Amlogic internal Ethernet team to this discussion? My questions are documented in the patch description of patch #2. Dependencies: this series is based on my other series [1] "net: stmmac: dwmac-meson8b: Fix the RGMII TX delay on Meson8b/8m2 SoCs" @David: please do NOT merge this series yet, it's only meant for discussion in it's current state! [0] https://patchwork.kernel.org/patch/11309891/ [1] https://patchwork.kernel.org/patch/11310669/ Martin Blumenstingl (2): net: stmmac: dwmac-meson8b: use FIELD_PREP instead of open-coding it net: stmmac: dwmac-meson8b: add support for the RX delay configuration .../ethernet/stmicro/stmmac/dwmac-meson8b.c | 60 ++++++++++--------- 1 file changed, 33 insertions(+), 27 deletions(-)