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_init_board() time, so we currently can not use available "pcidelay" option for waiting before PCI bus scan since this waiting takes place before calling pci_init_board(). By moving the pcidelay code to the new location using of the "pcidelay" option is possible on mpc5200 or mpc8260 based boards, too.
Since pci_hose_scan() could be called multiple times, restrict the function to wait only during its first call and to ignore pcidelay for any further call (as pointed out by Matthias).
Signed-off-by: Anatolij Gustschin agust@denx.de Cc: Matthias Fuchs matthias.fuchs@esd.eu --- Changes since first version: - extend to wait only during initial pci_hose_scan() call as pointed out by Matthias
drivers/pci/pci.c | 30 +++++++++++++++++------------- 1 files changed, 17 insertions(+), 13 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 1a0b14c..5f1f128 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -695,6 +695,23 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus)
int pci_hose_scan(struct pci_controller *hose) { +#if defined(CONFIG_PCI_BOOTDELAY) + static int pcidelay_done; + char *s; + int i; + + if (!pcidelay_done) { + /* wait "pcidelay" ms (if defined)... */ + s = getenv("pcidelay"); + if (s) { + int val = simple_strtoul(s, NULL, 10); + for (i = 0; i < val; i++) + udelay(1000); + } + pcidelay_done = 1; + } +#endif /* CONFIG_PCI_BOOTDELAY */ + /* Start scan at current_busno. * PCIe will start scan at first_busno+1. */ @@ -709,19 +726,6 @@ int pci_hose_scan(struct pci_controller *hose)
void pci_init(void) { -#if defined(CONFIG_PCI_BOOTDELAY) - char *s; - int i; - - /* wait "pcidelay" ms (if defined)... */ - s = getenv ("pcidelay"); - if (s) { - int val = simple_strtoul (s, NULL, 10); - for (i=0; i<val; i++) - udelay (1000); - } -#endif /* CONFIG_PCI_BOOTDELAY */ - hose_head = NULL;
/* now call board specific pci_init()... */