From: Hou Zhiqiang Zhiqiang.Hou@nxp.com
As the PCIe specification recommend reading the Vendor ID register to determine if a Function is present, read the Vendor ID of a non-existent Function must not result in system error, so we'd better make the first CFG read to Vendor ID instead of Header Type register in the PCIe enumeration.
Signed-off-by: Hou Zhiqiang Zhiqiang.Hou@nxp.com --- drivers/pci/pci.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 221054593e..590f7b123a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -361,13 +361,13 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus) if (PCI_FUNC(dev) && !found_multi) continue;
- pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type); - pci_hose_read_config_word(hose, dev, PCI_VENDOR_ID, &vendor);
if (vendor == 0xffff || vendor == 0x0000) continue;
+ pci_hose_read_config_byte(hose, dev, PCI_HEADER_TYPE, &header_type); + if (!PCI_FUNC(dev)) found_multi = header_type & 0x80;