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Wed, 28 Oct 2026 21:19:42 -0700 (PDT) Received: from hu-krichai-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-36a237be80csm27504539eec.2.2026.10.28.21.19.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Oct 2026 21:19:41 -0700 (PDT) From: Krishna Chaitanya Chundru Subject: [PATCH v7 0/3] PCI: qcom: Implement shutdown() to avoid SMMU/NoC errors on reboot Date: Thu, 29 Oct 2026 09:49:26 +0530 Message-Id: <20261029-shutdown-v7-0-3fd7a76a6991@oss.qualcomm.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAE7J4moC/3XQy27DIBAF0F+JWIcIhoftrvofVRc8hpoqMa2x3 UaR/z04XZRFvEG60j13JG4k4xgxk5fDjYy4xBzTUEJzPBDXm+EDafQlE2CgWQtAcz9PPv0MNGD LRedDANuQUv8aMcTfx9Tb+1/Os/1EN21+a/QxT2m8Pm4tsPWezC5AGVXAjG4Dt9Ko15Tz6Xs2Z 5cul1N5yLa+iNrLyoviW+64tLYx3IQdL2uvKy+LR6sCdl4qaXDHq3/fMVV5VXxgTlsTDPdy776 ufVd5Xbwuf2o9BwFCP/Hrut4B3NOQGrkBAAA= 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 parameter to dw_pcie_suspend_noirq() so 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 v7: - rebased on pci. - Link to v6: https://patch.msgid.link/20260909-shutdown-v6-0-62b7bd123236@oss.qualcomm.com Changes in v6: - remove return 0 in d3cold_possible() (konrad) - use force as a paramter instead of the element (Mani) - couple of nits (Konrad) - call pm_runtime calls for firmware managed one also as we are enabling pm_runtime_enable and get for that also. - Link to v5: https://patch.msgid.link/20260905-shutdown-v5-0-f0c6bafa1d4f@oss.qualcomm.com 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/pci-imx6.c | 2 +- drivers/pci/controller/dwc/pci-layerscape.c | 2 +- drivers/pci/controller/dwc/pcie-designware-host.c | 9 +++--- drivers/pci/controller/dwc/pcie-designware.h | 4 +-- drivers/pci/controller/dwc/pcie-eswin.c | 2 +- drivers/pci/controller/dwc/pcie-nxp-s32g.c | 2 +- drivers/pci/controller/dwc/pcie-qcom.c | 37 ++++++++++++++++++++++- drivers/pci/controller/dwc/pcie-rcar-gen4.c | 2 +- drivers/pci/controller/dwc/pcie-stm32.c | 2 +- drivers/pci/controller/dwc/pcie-ultrarisc.c | 2 +- drivers/pci/controller/pci-host-common.c | 13 +++----- 11 files changed, 53 insertions(+), 24 deletions(-) --- base-commit: 17bb0e2f6c8043f70a693a5f3797471cbed354c8 change-id: 20260822-shutdown-fe8139dff2b7 Best regards, -- Krishna Chaitanya Chundru