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Sat, 17 Oct 2026 09:39:26 -0700 (PDT) Date: Sat, 17 Oct 2026 22:09:10 +0530 From: Mohd Ayaan Anwar To: Bartosz Golaszewski Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Andrew Lunn , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , Vinod Koul , Giuseppe Cavallaro , Chen-Yu Tsai , Jernej Skrabec , Neil Armstrong , Kevin Hilman , Jerome Brunet , Shawn Guo , Fabio Estevam , Jan Petrous , s32@nxp.com, Romain Gantois , Geert Uytterhoeven , Magnus Damm , Maxime Ripard , Christophe Roullier , Bartosz Golaszewski , Eric Dumazet , Radu Rendec , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Drew Fustini , linux-sunxi@lists.linux.dev, linux-amlogic@lists.infradead.org, linux-mips@vger.kernel.org, imx@lists.linux.dev, linux-renesas-soc@vger.kernel.org, linux-rockchip@lists.infradead.org, sophgo@lists.linux.dev, linux-riscv@lists.infradead.org, Bartosz Golaszewski Subject: Re: [PATCH net-next v16 4/7] net: stmmac: qcom-ethqos: update phy_mode to the resolved interface in mac_finish() Message-ID: References: <20261014-qcom-sa8255p-emac-v16-0-0266c2ead980@oss.qualcomm.com> <20261014-qcom-sa8255p-emac-v16-4-0266c2ead980@oss.qualcomm.com> Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261014-qcom-sa8255p-emac-v16-4-0266c2ead980@oss.qualcomm.com> X-Proofpoint-Spam-Info: AW1haW4tMjYxMDE3MDA2NiBTYWx0ZWRfXyahv9Cp88xNV D2fKWAG3HrTC04EIxUgOByzzge/h8HOHpKPiNd9b+k1IM2beFPSVXdJVFHc3QF/a96I0iGTCsbm OgzOfhzo5SIuJ07qGd4QGSbtm2bGJsQ= X-Authority-Analysis: v=2.4 cv=FayiV5+6 c=1 sm=1 tr=0 ts=6ad3a4c2 cx=c_pps a=cFYjgdjTJScbgFmBucgdfQ==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=660iZSQnnn4A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=EUspDBNiAAAA:8 a=K33ZUWoUxhUzfzW7EYwA:9 a=CjuIK1q_8ugA:10 a=scEy_gLbYbu1JhEsrz4S:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDE3MDA2NiBTYWx0ZWRfXzRb2R+Q0smZk Tkd+Wf3mmTSm6VTkL/wwiddLmAj4lWa0WZCs/oAfrKodbmHbxl6cCJjUUqJPyJYNp40IN1Iz7eB wn1NCLnhx1JMGqkUPU5frmfCBqBUfKFy2/foRMcRkZ15iVe3o9LMzYUoGF3YmwJY2WZelxP9FcI pGs8LsQvyFGd2s1vfUKm/bZGHJXqpkbYY8Vklz3n00Om90ttxa00k6ecZtaC/wz53RP2+Ielk7V atyVrgloR8TflOFHM/ARLzxTXLDUpZaWZO1b8Scagx0yD041/T3QEggmPShM7+PWioANSxgwK4x OWJZblsVkC0yh6Td0R+0NZGz2eR2LRtxwEfT8w19z3OxJf6ZRukVaxYkag5WqnWdVzdUkR1K1cA OAyZFJ8KS06SzZA5PwTAmwcdH2LKfSm02wVhNIBo5C6aZw4D+PlNQR4Ms1B75aNg7KfqMRGKNDL onyexTac3yfUhAqmyOg== X-Proofpoint-ORIG-GUID: hb5CXng2lAnC6wj4z0KRbWwMqUm0KJY8 X-Proofpoint-GUID: hb5CXng2lAnC6wj4z0KRbWwMqUm0KJY8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-17_05,2026-10-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 impostorscore=0 adultscore=0 clxscore=1015 priorityscore=1501 phishscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610170066 On Wed, Oct 14, 2026 at 02:36:43PM +0200, Bartosz Golaszewski wrote: > ethqos->phy_mode is read by serdes_powerup() and > qcom_ethqos_set_sgmii_loopback() to configure the SerDes and its > wrapper for the correct interface. It is set once at probe from the DT > phy-mode property and never updated. > > phylink resolves the actual runtime interface and passes it to the > mac_finish() callback. On platforms that only ever operate at one speed > these two values are always the same, but when the interface changes > at runtime - for example switching between SGMII and 2500BASE-X - the > stored value becomes stale. The next serdes_powerup() call, on > a subsequent link cycle, then reinitializes the SerDes to the wrong mode. > > Update ethqos->phy_mode from the interface argument in > ethqos_mac_finish_serdes() so that it always reflects the last > resolved interface. > > With that, we now update the phy_mode to the runtime-resolved interface, > so any subsequent resume with a 1G SGMII link skips the loopback setup > and the DMA reset hangs. To remedy this, extend the guard to include > PHY_INTERFACE_MODE_SGMII. > > Signed-off-by: Bartosz Golaszewski > --- I am not sure but should this have a Fixes: tag? Reviewed-by: Mohd Ayaan Anwar Ayaan