PCI cards might need some time after reset to respond. On some boards (mpc5200 or mpc8260 based) the PCI bus reset is deasserted at pci_board_init() time, so we can not use available "pcidelay" option for waiting before pci bus scan here. Add an option to delay bus scan by setting "pci_scan_delay" environment variable.
Signed-off-by: Anatolij Gustschin agust@denx.de --- drivers/pci/pci.c | 14 ++++++++++++++ 1 files changed, 14 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index cdfc4fb..2206c12 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -699,6 +699,20 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus)
int pci_hose_scan(struct pci_controller *hose) { +#if defined(CONFIG_PCI_SCAN_DELAY) + const char *s; + int i; + + /* wait "pci_scan_delay" ms, limit to max. 1 s */ + s = getenv("pci_scan_delay"); + if (s) { + int val = simple_strtoul(s, NULL, 10); + if (val > 1000) + val = 1000; + for (i = 0; i < val; i++) + udelay(1000); + } +#endif /* Start scan at current_busno. * PCIe will start scan at first_busno+1. */