pci: Honour pci_skip_dev()

When enumerating devices, honour the pci_skip_dev() function. This can
be used by PCI controller drivers to restrict which devices will be
probed.

This is required by the NVIDIA Tegra PCIe controller driver, which will
fail with a data abort exception if an access is attempted to a device
number larger than 0 outside of bus 0. pci_skip_dev() is therefore
implemented to prevent any such accesses.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/pci/pci.c

@@ -195,6 +195,9 @@ pci_dev_t pci_find_devices(struct pci_device_id *ids, int index)
 			     bdf < PCI_BDF(bus + 1, 0, 0);
 #endif
 			     bdf += PCI_BDF(0, 0, 1)) {
+				if (pci_skip_dev(hose, bdf))
+					continue;
+
 				if (!PCI_FUNC(bdf)) {
 					pci_read_config_byte(bdf,
 							     PCI_HEADER_TYPE,