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

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Qiang Yu 2025-11-09 22:59:43 -08:00 • committed by Manivannan Sadhasivam

parent f5cd8a929c

commit 7c29cd0fdc

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drivers/pci/controller/dwc/pcie-qcom.c

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