From: Vivek Pernamitta <quic_vpernami@xxxxxxxxxxx> In SRIOV enabled devices, the VF DEVICE/VENDOR ID register returns FFFFh when read (PCIe SRIOV spec-3.4.1.1). Therefore, read the PCIe SUBSYSTEM_VENDOR_ID to check if the device is active. Signed-off-by: Vivek Pernamitta <quic_vpernami@xxxxxxxxxxx> --- drivers/bus/mhi/host/pci_generic.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c index 22de02c26ceb946fb618d962ac8882d2db1be6b4..938f37d306a18b9a47f302df85697f837c225f0d 100644 --- a/drivers/bus/mhi/host/pci_generic.c +++ b/drivers/bus/mhi/host/pci_generic.c @@ -1025,8 +1025,10 @@ static bool mhi_pci_is_alive(struct mhi_controller *mhi_cntrl) struct pci_dev *pdev = to_pci_dev(mhi_cntrl->cntrl_dev); u16 vendor = 0; - if (pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor)) - return false; + if (pdev->is_virtfn) + pci_read_config_word(pdev, PCI_SUBSYSTEM_VENDOR_ID, &vendor); + else + pci_read_config_word(pdev, PCI_VENDOR_ID, &vendor); if (vendor == (u16) ~0 || vendor == 0) return false; -- 2.34.1
