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PCI: qcom: Skip DWC MSI host initialization when DT 'msi-map' is present

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qcom_pcie_ecam_host_init() unconditionally initializes the DesignWare
internal MSI controller and sets use_imsi_rx, irrespective of whether an
external MSI controller is described for the host bridge. When an 'msi-map'
DT property is present, MSI interrupts are handled by the mapped external
MSI controller. Initializing the internal iMSI-RX domain in this case is
unnecessary.

Set use_imsi_rx based on the presence of 'msi-map' in DT and initialize the
DesignWare MSI host only when iMSI-RX is required.

Signed-off-by: Ayiluri Naga Rashmi <ayiluri.rashmi@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20260917-skipmsi_forlpi-v1-1-14a4932a4311@oss.qualcomm.com
This commit is contained in:
Ayiluri Naga Rashmi 2026-09-17 16:43:28 +05:30 committed by Bjorn Helgaas
parent bea2ff3b9d
commit a67716078b
1 changed files with 6 additions and 4 deletions
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10
drivers/pci/controller/dwc/pcie-qcom.c
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@ -2022,11 +2022,13 @@ static int qcom_pcie_ecam_host_init(struct pci_config_window *cfg)
*/
raw_spin_lock_init(&pp->lock);
ret = dw_pcie_msi_host_init(pp);
if (ret)
return ret;
pp->use_imsi_rx = !pci_host_of_has_msi_map(dev);
if (pp->use_imsi_rx) {
ret = dw_pcie_msi_host_init(pp);
if (ret)
return ret;
}
pp->use_imsi_rx = true;
dw_pcie_msi_init(pp);
return devm_add_action_or_reset(dev, qcom_pci_free_msi, pp);