From: Hou Zhiqiang <zhiqiang....@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....@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;
--
2.17.1
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