[U-Boot] [PATCH v2 1/1] pci: move pcidelay code to new location just before PCI bus scan

[Anatolij Gustschin]

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 at denx.de>
Cc: Matthias Fuchs <matthias.fuchs at 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()... */
-- 
1.7.1