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Mon, 10 Aug 2026 05:49:15 -0700 (PDT) From: Sandeep Sondagar To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sandeep Sondagar , nb@tipi-net.de, linux@armlinux.org.uk, andrew@lunn.ch, hkallweit1@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, j4g8y7@gmail.com, robert.marko@sartura.hr Subject: Re: [PATCH net v3] net: phylink: treat PSGMII as an inband capable interface Date: Mon, 10 Aug 2026 18:19:08 +0530 Message-ID: <20260810124908.145701-1-sandeepsondagar@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260809-phylink-psgmii-v3-1-908dcd3a9e3d@gmail.com> References: <20260809-phylink-psgmii-v3-1-908dcd3a9e3d@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Hi Nicolai, Thanks for your email. This was noticed while working on the OpenWrt support for the Jio AirFiber router (JIDU6J11) based on the IPQ9554 SoC, which exposes 5x gigabit ports (1 WAN + 4 LAN) through a Qualcomm PSGMII interface. While testing I found that the QSGMII mode works correctly, but the PSGMII mode has both a hotplug issue and an incorrect link detection issue: a 100Mbps copper link is reported as 1Gbps, so the link can't pass traffic at the negotiated speed. While tracing it, I found PHY_INTERFACE_MODE_PSGMII was missing from the phylink in-band handling, so the PCS was being programmed in force mode with its default 1000base control-register speed bits instead of using the in-band SGMII word. Best regards, Sandeep