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Tue, 20 Jan 2026 12:39:06 -0800 (PST) Received: from eichest-laptop.lan ([2a02:168:af72:0:378b:c660:2f9c:b651]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48042c3a7c1sm850425e9.13.2026.01.20.12.39.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 12:39:06 -0800 (PST) From: Stefan Eichenberger To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, hkallweit1@gmail.com, linux@armlinux.org.uk, linux-stm32@st-md-mailman.stormreply.com, maxime.chevallier@bootlin.com, francesco.dolcini@toradex.com Cc: netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH net-next v3 0/3] net: stmmac: dwmac: enforce preamble before SFD for i.MX8MP Date: Tue, 20 Jan 2026 21:30:01 +0100 Message-ID: <20260120203905.23805-1-eichest@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds a new phy_device flag PHY_F_KEEP_PREAMBLE_BEFORE_SFD that allows a MAC driver to request to keep the preamble bytes before the start frame delimiter (SFD) when receiving frames from the PHY. This flag is set in the stmmac driver for the i.MX8MP SoC due to errata (ERR050694), which causes it to drop frames without a preamble. The Micrel KSZ9131 PHY supports keeping the preamble before SFD by setting an undocumented flag, that was confirmed by NXP and Micrel. This new feature has been added to the Micrel PHY driver for the KSZ9131 PHY. Changes since v2: - Instead of using phy_register_fixup add a new phy_device::dev_flags flag PHY_F_KEEP_PREAMBLE_BEFORE_SFD so that a MAC can request to keep the preamble before SFD if needed (Russell) - Link to v2: https://lore.kernel.org/all/20260105100245.19317-1-eichest@gmail.com/ Changes since v1: - Use phy_register_fixup_for_uid() instead of adding a new device tree property - I will send the conversion of the micrel.txt binding as a separate patch series - Link to v1: https://lore.kernel.org/all/20251212084657.29239-1-eichest@gmail.com/ Stefan Eichenberger (3): net: phy: add a new phy_device flag to keep preamble before sfd net: phy: micrel: add option to keep the preamble before sfd for KSZ9131 net: stmmac: dwmac-imx: keep preamble before sfd on i.MX8MP drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c | 6 +++++- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 +++++++- drivers/net/phy/micrel.c | 14 +++++++++++++- include/linux/phy.h | 5 +++-- include/linux/stmmac.h | 1 + 5 files changed, 29 insertions(+), 5 deletions(-) -- 2.51.0