PCI: dwc: Print debug error message when MSI-X entry control mask bit is set

Add debug error message when MSI-X entry control mask bit is set, to help
debug the reason why a MSI-X interrupt is not being triggered.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Joao Pinto <joao.pinto@synopsys.com>

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index a543c45..5e766af 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -465,8 +465,10 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no,
 
        iounmap(msix_tbl);
 
-       if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)
+       if (vec_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT) {
+               dev_dbg(pci->dev, "MSI-X entry ctrl set\n");
                return -EPERM;
+       }
 
        ret = dw_pcie_ep_map_addr(epc, func_no, ep->msi_mem_phys, msg_addr,
                                  epc->mem->page_size);