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[199.106.103.52]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-3339aa37dbdsm23747143eec.11.2026.09.07.05.21.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Sep 2026 05:21:34 -0700 (PDT) From: Wei Deng To: Manivannan Sadhasivam , Bartosz Golaszewski Cc: linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, quic_chezhou@quicinc.com, cheng.jiang@oss.qualcomm.com, shuai.zhang@oss.qualcomm.com, jinwang.li@oss.qualcomm.com, xiuzhuo.shang@oss.qualcomm.com, mengshi.wu@oss.qualcomm.com Subject: [PATCH] power: sequencing: pwrseq-pcie-m2: Support PCIe switch topologies Date: Mon, 7 Sep 2026 17:51:29 +0530 Message-Id: <20260907122129.1577279-1-wei.deng@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Authority-Analysis: v=2.4 cv=Weg8rUhX c=1 sm=1 tr=0 ts=6a9eac4f cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=b9+bayejhc3NMeqCNyeLQQ==:17 a=VdqzKS8jKosA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=EUspDBNiAAAA:8 a=RVAIDergrmqZ-0WmEXkA:9 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-GUID: aRCWy8xsnRB0wAw_phs6SgAvjJNdgpJz X-Proofpoint-ORIG-GUID: aRCWy8xsnRB0wAw_phs6SgAvjJNdgpJz X-Proofpoint-Spam-Info: AW1haW4tMjYwOTA3MDEzNyBTYWx0ZWRfX/SOcNCzE3C6W d8dBkriwo6Q39lCo3gdghvt+ktGMa86/iKXnVC0e0WBMiEgTP2iwOYSu95RayU4RpsS2L7b2CTc ahuIwXvvuy5xnDzJQLyuaGEfgtHSz2E= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTA3MDEzNyBTYWx0ZWRfX8nGbT2BlUyLW xtgjR6Mc8t9uWGKeXpb4iqYa6DCFWa9J5bQkOnib15UTud+apVoUkoSy0y3UKqo6o9y8vnpW8mm 7YVXEUEzVzYk+7o3eWiqq22cXQ9JQ1DHa6dgHijeTCVHKDdnbJ5KkDf0MwSs6eYJUWCSQCkVsZb 30MbjiMkjQYa+FJQUquWjP896bHFZrv6rJANYAuNvhx6ft+rySagrFRLRWI8pQ+/P721GBAx03/ Y/0cLHDxXdCc3YY67iNgtctAx0/TsrvbnLmmvY8jEF8C12IVON4BBDQko++/fY5RX2nx4SgKJbH rZmmlsR7V8XN839ycxDbjnUrIEzVGr08EwvoPscxJJOgnlEzir+4BYD746rEI7+o37kyINO5Hg+ 5FD6UoxbdsBp6wddX2hc1/ca5kM4qiqavA9fSoOa90uWJjKAjjZuuhEaEU9CeizJUOfPtPmV0kq mODNRw5hfJZSLE8FL+g== 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=2026-09-07_03,2026-09-07_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2609070137 Content-Type: text/plain; charset="utf-8" The PCI parent OF node check in pwrseq_pcie_m2_notify() and pwrseq_pcie_m2_create_serdev() only looks at the immediate parent of the PCI endpoint device. This fails when a PCIe switch inserts one or more intermediate bridges between the root port and the endpoint. For example, on lemans-evk with IFP Mezzanine board, the Toshiba TC9562 PCIe switch creates two bridge devices (upstream and downstream ports) without OF nodes, so the WCN6855 BT device appears at depth 3 and its immediate parent has of_node=3DNULL. Add a helper pwrseq_pcie_m2_pci_parent_matches() that walks the PCI parent chain upward until it finds a device whose OF node matches the expected connector port node, or reaches a non-PCI device. Replace both single-level checks with this helper to handle arbitrary PCIe switch depths. Signed-off-by: Wei Deng Reviewed-by: Manivannan Sadhasivam --- drivers/power/sequencing/pwrseq-pcie-m2.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/power/sequencing/pwrseq-pcie-m2.c b/drivers/power/sequ= encing/pwrseq-pcie-m2.c index de9848a9a9f1..82ba309ba5f3 100644 --- a/drivers/power/sequencing/pwrseq-pcie-m2.c +++ b/drivers/power/sequencing/pwrseq-pcie-m2.c @@ -376,6 +376,21 @@ static void pwrseq_pcie_m2_remove_serdev(struct pwrseq= _pcie_m2_ctx *ctx, mutex_unlock(&ctx->list_lock); } =20 +static bool pwrseq_pcie_m2_pci_parent_matches(struct pci_dev *pdev, + struct device_node *pci_parent) +{ + struct device *dev =3D pdev->dev.parent; + + while (dev) { + if (dev->of_node =3D=3D pci_parent) + return true; + if (!dev_is_pci(dev)) + break; + dev =3D dev->parent; + } + return false; +} + static int pwrseq_pcie_m2_notify(struct notifier_block *nb, unsigned long = action, void *data) { @@ -390,7 +405,7 @@ static int pwrseq_pcie_m2_notify(struct notifier_block = *nb, unsigned long action */ struct device_node *pci_parent __free(device_node) =3D of_graph_get_remote_node(dev_of_node(ctx->dev), 0, 0); - if (!pci_parent || (pci_parent !=3D pdev->dev.parent->of_node)) + if (!pci_parent || !pwrseq_pcie_m2_pci_parent_matches(pdev, pci_parent)) return NOTIFY_DONE; =20 switch (action) { @@ -464,7 +479,7 @@ static int pwrseq_pcie_m2_create_serdev(struct pwrseq_p= cie_m2_ctx *ctx) =20 /* Create serdev for existing PCI devices if required */ for_each_pci_dev(pdev) { - if (!pdev->dev.parent || pci_parent !=3D pdev->dev.parent->of_node) + if (!pwrseq_pcie_m2_pci_parent_matches(pdev, pci_parent)) continue; =20 if (!pci_match_id(pwrseq_m2_pci_ids, pdev)) --=20 2.34.1