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PCI: Disable ACS SV for IDT 0x8090 switch

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The IDT switch with Device ID 0x8090 used in the ARM Juno R2 development
board incorrectly raises an ACS Source Validation error on Completions for
Config Read Requests, even though PCIe r7.0, sec 6.12.1.1, says that
Completions are never affected by ACS Source Validation.

This is already handled by the pci_disable_broken_acs_cap() quirk for the
IDT 0x80b5 switch. Extend the quirk for the 0x8090 device too.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Naresh Kamboju <naresh.kamboju@linaro.org>
Link: https://patch.msgid.link/20260102-pci_acs-v3-4-72280b94d288@oss.qualcomm.com
This commit is contained in:
Manivannan Sadhasivam 2026-01-02 21:04:50 +05:30 committed by Bjorn Helgaas
parent b26d7fb4a5
commit b5f88a3947
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/quirks.c
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@ -5824,7 +5824,7 @@ DECLARE_PCI_FIXUP_CLASS_RESUME_EARLY(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
void pci_disable_broken_acs_cap(struct pci_dev *pdev)
{
if (pdev->vendor == PCI_VENDOR_ID_IDT &&
pdev->device == 0x80b5) {
(pdev->device == 0x80b5 || pdev->device == 0x8090)) {
pci_info(pdev, "Disabling broken ACS SV; downstream device isolation reduced\n");
pdev->acs_capabilities &= ~PCI_ACS_SV;
}