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Thu, 25 Jun 2026 23:13:52 -0700 (PDT) X-Received: by 2002:a05:7300:1488:b0:30b:ff0d:1efa with SMTP id 5a478bee46e88-30c84d9b4c8mr4532498eec.24.1782454431566; Thu, 25 Jun 2026 23:13:51 -0700 (PDT) Received: from oss.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30c9c456cf5sm3782007eec.2.2026.06.25.23.13.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jun 2026 23:13:51 -0700 (PDT) Date: Fri, 26 Jun 2026 11:43:43 +0530 From: Mohd Ayaan Anwar To: Loic Poulain Cc: Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bartosz Golaszewski , Bjorn Andersson , Konrad Dybcio , Wasim Nazir , Mohd Ayaan Anwar , Yijie Yang , linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Konrad Dybcio Subject: Re: [PATCH 0/6] Additional regulator support for the Qualcomm SGMII SerDes PHY Message-ID: References: <20251124-sgmiieth_serdes_regulator-v1-0-73ae8f9cbe2a@oss.qualcomm.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-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Authority-Analysis: v=2.4 cv=API5kwXb c=1 sm=1 tr=0 ts=6a3e18a0 cx=c_pps a=Uww141gWH0fZj/3QKPojxA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=evnvvmh2EKmFMqWf2KwA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=PxkB5W3o20Ba91AHUih5:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjI2MDA0NyBTYWx0ZWRfX3Xg+VCHjTSop YBJ8fdMTdcazvWb83pRusYZlLuuTp3KzSjWGT2jZktmmK3FzXbVwV4fDanCm0SjYitHTcW7qkMf G/t2rPSwVLxKzvFkZ625uPENu4tLNNXp+5jig03Z4Deg5VbKrBC7eWgXdskenJHuCGRofLWwh2s alW7UUx8uZTniiFBYbno3eObidp+/6Qh002Bzj/HRluyajCECXwdQDwt+bN4hYmr0ba/sNPe+uM YITXiUz7yIpvIkkIClo7/tEWX4KSX7Jxv5FwQCQQ3AC4A9HA+CFju1ZHcxH32fStI4TnEzP7561 HTDAGyHq64Tx78kZL/KF4GiBFffbUAdExjH0dFQaw2lxCAy5yJtBKq//Y/k3U0tkxO/ykz3AXpZ /w1UkuN6q2OLjuEbDvw+GHAdjb2T+zBwejlo9wUfKGU/SvDUkn23rR2+GRzCTL7JE3D9gm1gV6i 5FGFdZW3Ysh5wxjLcmA== X-Proofpoint-ORIG-GUID: EvWkYMj-7QQL_zhOW85UYyrWd4Phhx2D X-Proofpoint-GUID: EvWkYMj-7QQL_zhOW85UYyrWd4Phhx2D X-Proofpoint-Spam-Info: AW1haW4tMjYwNjI2MDA0NyBTYWx0ZWRfXxNg7A7+9JS06 xpcOElqg+wHKf1nDm2VgZjxj4wctkH+vMEV87x6Xc3FNBRW9DRrWqdEujgVTSRDL6UcAIWROMod RDi+sDjOpODTPGn732CsAHVKlD459G8= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-26_01,2026-06-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 clxscore=1015 bulkscore=0 impostorscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 malwarescore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606260047 On Mon, Jun 22, 2026 at 04:08:55PM +0200, Loic Poulain wrote: > Hi, > > On Mon, Nov 24, 2025 at 10:26 AM Mohd Ayaan Anwar > wrote: > > > > This patch series addresses a SerDes power-up failure observed on the > > QCS8300 Ride board using the phy-qcom-sgmii-eth driver. The issue occurs > > because the SerDes PHY requires both L5A and L4A regulators to be > > enabled during initialization. If either one of them is disabled, the > > status register does not reset, and the Ethernet interface fails to come > > up due to a timeout: > > > > [ 77.105651] qcom-dwmac-sgmii-phy 8909000.phy: QSERDES_COM_C_READY_STATUS timed-out > > [ 77.113447] qcom-ethqos 23040000.ethernet eth0: __stmmac_open: Serdes powerup failed > > > > Presumably, the issue is not seen on all users of this PHY because both > > regulators are often shared with other peripherals. However, the power > > rail schematics for boards using this SerDes PHY show that it is > > supplied by both L5A (1.2V) and L4A (0.9V) regulators. > > > > This series has been tested on the QCS8300 Ride board, and the reported > > issue was resolved. All Monaco and Lemans derivative boards require this > > new configuration as they use the same SerDes PHY. > > > > Signed-off-by: Mohd Ayaan Anwar > > This appears to be a real issue, but I haven’t seen a new version of > the series or any response to the feedback so far. Could you please > follow up on this? > I will shortly send out a v2. I got access to more details about the hardware, and it has two dedicated regulators which need to be enabled. The same requirements are there on all Lemans/Monaco-based boards. Ayaan