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[89.176.136.191]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cd8b9a2efsm140752035e9.3.2026.08.31.22.28.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2026 22:28:24 -0700 (PDT) From: Petr Wozniak To: sashal@kernel.org Cc: patches@lists.linux.dev, stable@vger.kernel.org, maxime.chevallier@bootlin.com, kuba@kernel.org, andrew@lunn.ch, hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, linux@armlinux.org.uk, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Petr Wozniak Subject: Re: [PATCH AUTOSEL 6.18-6.1] net: phy: sfp: probe for RollBall I2C-to-MDIO bridge in mdio-i2c Date: Tue, 1 Sep 2026 07:28:16 +0200 Message-ID: <20260901052816.3815-1-petr.wozniak@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260831133314.4125787-466-sashal@kernel.org> References: <20260831133314.4125787-466-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Please drop this one from AUTOSEL. 8fe125892f40 was reverted upstream on 2026-06-29 in b521003c27eb ("Revert "net: phy: sfp: probe for RollBall I2C-to-MDIO bridge in mdio-i2c""), so it is no longer in mainline. The probe it added runs in SFP_S_INIT, before genuine RollBall modules have finished initialising their bridge, so the bridge does not answer CMD_READ/CMD_DONE within the 200 ms window. mdio_protocol is then set to MDIO_I2C_NONE and PHY detection is skipped for modules that worked before the commit. Maxime Chevallier and Aleksander Bajkowski both confirmed that on hardware. The timing is per-module rather than per-PHY: the FLYPRO SFP-10GT-CS-30M they tested carries the same AQR113C as a module here that answers within 200 ms, but needs seconds to load its PHY firmware from SPI. A fixed probe window cannot cover both, which is why the commit was reverted rather than adjusted. A proper fix needs per-module init timing, and per SFF-8472 the host must wait at least 300 ms after insertion in any case. Backporting this to stable would reintroduce that regression on hardware that works there today. Thanks, Petr