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PCI: qcom: Remove MSI-X Capability for Root Ports

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On some platforms like Glymur, the hardware does not support MSI-X in RC
mode, yet still exposes the MSI-X capability. However, it omits the
required MSI-X Table and PBA structures.

This mismatch can lead to issues where the PCIe port driver requests MSI-X
instead of MSI, causing the Root Port to trigger interrupts by writing to
an uninitialized address, resulting in SMMU faults.

To address this, remove MSI-X capability unconditionally for Root Ports of
all SoCs as none of the Qcom PCIe Root Ports support MSI-X.

Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
[mani: updated description]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20251109-remove_cap-v1-4-2208f46f4dc2@oss.qualcomm.com
This commit is contained in:
Qiang Yu 2025-11-09 22:59:43 -08:00 committed by Manivannan Sadhasivam
parent f5cd8a929c
commit 7c29cd0fdc
1 changed files with 2 additions and 0 deletions
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2
drivers/pci/controller/dwc/pcie-qcom.c
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@ -1316,6 +1316,8 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
goto err_disable_phy;
}
dw_pcie_remove_capability(pcie->pci, PCI_CAP_ID_MSIX);
qcom_ep_reset_deassert(pcie);
if (pcie->cfg->ops->config_sid) {