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Fri, 04 Sep 2026 17:48:59 -0700 (PDT) Received: from hu-krichai-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1432441f5f2sm10843907c88.15.2026.09.04.17.48.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Sep 2026 17:48:59 -0700 (PDT) From: Krishna Chaitanya Chundru Subject: [PATCH v5 0/3] PCI: qcom: Implement shutdown() to avoid SMMU/NoC errors on reboot Date: Sat, 05 Sep 2026 06:18:47 +0530 Message-Id: <20260905-shutdown-v5-0-f0c6bafa1d4f@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAO9mm2oC/3XNyw6CMBAF0F8hXVtCS8vDlf9hXPQxlRqhSgE1h H+3xQ0L3Exyk3vuzMhDb8GjYzKjHibrretC4IcEqUZ0V8BWh4xoRousohT7Zhy0e3XYQEXyWht DZYlC/dGDse916nz5ZT/KG6gh+thorB9c/1l/TTT2dmYnijPMaSaKyhDJBD8579PnKO7KtW0aD orrU771bOPz4CuiCJOyFESYP55tfbHxLHiQ3ECtGWcCdvyyLF8E27jHOQEAAA== X-Change-ID: 20260822-shutdown-fe8139dff2b7 To: Jingoo Han , Manivannan Sadhasivam , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Rob Herring , Bjorn Helgaas Cc: konrad.dybcio@oss.qualcomm.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Krishna Chaitanya Chundru , Manivannan Sadhasivam X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; 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If the link is still up when that happens, it can trigger SMMU or NoC errors. This series adds a shutdown() callback to the Qualcomm PCIe host driver that forces the link into L2/D3cold before shutdown proceeds, reusing the existing suspend_noirq() path. Patch 1 fixes pci_host_common_d3cold_possible()'s underlying bus walk, which aborts as soon as it finds a device outside D3hot and can therefore miss a later PME-capable device -- something that becomes common once patch 3 starts forcing D3cold entry during shutdown while endpoints may still be in D0. Patch 2 adds a "force_d3cold" flag to struct dw_pcie_rp that callers can set to make dw_pcie_suspend_noirq() force L2 entry during shutdown/ reboot, skipping the D3cold capability check that can otherwise leave the link up if any endpoint hasn't suspended yet. Patch 3 adds qcom_pcie_shutdown() and wires it up as .shutdown. Signed-off-by: Krishna Chaitanya Chundru --- Changes in v5: - use a flag/parameter Instead of poking the system states (Mani) - Fix pme_wakeup issue by walking through entire bus (Sashiko) - Fix Irq free issue by using dwc free msi API (Sashiko) - Link to v4: https://patch.msgid.link/20260826-shutdown-v4-0-eb5fe9d454ae@oss.qualcomm.com Changes in v4: - removed goto d3cold, (Konrad & Sashiko for PME error) - Disabling MSI IRQ's (Sashiko) - Link to v3: https://patch.msgid.link/20260824-shutdown-v3-0-81c14bb7a1af@oss.qualcomm.com Changes in v3: - Added null point check and use pm_runtime_put_sync (Sashiko). - Link to v2: https://patch.msgid.link/20260822-shutdown-v2-0-520a68f1b4a5@oss.qualcomm.com Changes in v2: 1) don't remove the endpoint pci dev's only keep link in D3cold. Link to v1: https://lore.kernel.org/all/20250401-shutdown-v1-1-f699859403ae@oss.qualcomm.com/ --- Krishna Chaitanya Chundru (2): PCI: host-common: Fix early bus-walk exit in d3cold_possible() PCI: dwc: Force L2 link entry on shutdown/reboot without D3cold check Manivannan Sadhasivam (1): PCI: qcom: Implement shutdown() callback drivers/pci/controller/dwc/pcie-designware-host.c | 5 +-- drivers/pci/controller/dwc/pcie-designware.h | 1 + drivers/pci/controller/dwc/pcie-qcom.c | 38 +++++++++++++++++++++++ drivers/pci/controller/pci-host-common.c | 17 +++++----- 4 files changed, 49 insertions(+), 12 deletions(-) --- base-commit: 39ee38a9fa2eaeff030a6c865abb244597c091eb change-id: 20260822-shutdown-fe8139dff2b7 Best regards, -- Krishna Chaitanya Chundru