linux-kernel - [PATCH 5/5] PCI: qcom: Remove DPC Extended Capability

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Message-Id: <20251109-remove_cap-v1-5-2208f46f4dc2@oss.qualcomm.com>
Date: Sun, 09 Nov 2025 22:59:44 -0800
From: Qiang Yu <qiang.yu@....qualcomm.com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Qiang Yu <qiang.yu@....qualcomm.com>,
        Wenbin Yao <wenbin.yao@....qualcomm.com>
Subject: [PATCH 5/5] PCI: qcom: Remove DPC Extended Capability

Some platforms (e.g., X1E80100) expose Downstream Port Containment (DPC)
Extended Capability registers in the PCIe Root Port config space, but do
not fully support it. To prevent undefined behavior and ensure DPC cap is
not visible to PCI framework and users, remove DPC Extended Capability
unconditionally, since there is no qcom platform support DPC till now.

Co-developed-by: Wenbin Yao <wenbin.yao@....qualcomm.com>
Signed-off-by: Wenbin Yao <wenbin.yao@....qualcomm.com>
Signed-off-by: Qiang Yu <qiang.yu@....qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-qcom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 09443ffbb150e9c91bfd3b2adf15286ef2f00a2a..1b0f72bc38d912ab46739aa7f904ceca617c668d 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -1351,6 +1351,7 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
 	}
 
 	dw_pcie_remove_capability(pcie->pci, PCI_CAP_ID_MSIX);
+	dw_pcie_remove_ext_capability(pcie->pci, PCI_EXT_CAP_ID_DPC);
 
 	qcom_ep_reset_deassert(pcie);
 

-- 
2.34.1