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WORKAROUND: Disable L0s to fix wlan functionality #506

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WORKAROUND: Disable L0s to fix wlan functionality #506

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45cb306
Revert "Revert "FROMLIST: PCI: dwc: Remove MSI/MSIX capability if iMS…
krishnachaitanya-linux Apr 23, 2026
3bb5cae
FROMLIST: PCI: qcom: Disable ASPM L0s for SA8775P
Apr 19, 2026
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10 changes: 10 additions & 0 deletions drivers/pci/controller/dwc/pcie-designware-host.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1106,6 +1106,16 @@ int dw_pcie_setup_rc(struct dw_pcie_rp *pp)

dw_pcie_dbi_ro_wr_dis(pci);

/*
* If iMSI-RX module is used as the MSI controller, remove MSI and
* MSI-X capabilities from PCIe Root Ports to ensure fallback to INTx
* interrupt handling.
*/
if (pp->has_msi_ctrl) {
dw_pcie_remove_capability(pci, PCI_CAP_ID_MSI);
dw_pcie_remove_capability(pci, PCI_CAP_ID_MSIX);
}

return 0;
}
EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
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1 change: 1 addition & 0 deletions drivers/pci/controller/dwc/pcie-qcom.c
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Expand Up @@ -1483,6 +1483,7 @@ static const struct qcom_pcie_cfg cfg_1_9_0 = {
static const struct qcom_pcie_cfg cfg_1_34_0 = {
.ops = &ops_1_9_0,
.override_no_snoop = true,
.no_l0s = true,
};

static const struct qcom_pcie_cfg cfg_2_1_0 = {
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