PCI: Warn periodically while waiting for non-CRS ("device ready") status

Add a print statement in pci_bus_wait_crs() so that user observes the
progress of device polling instead of silently waiting for timeout to be
reached.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
[bhelgaas: check for timeout first so we don't print "waiting, giving up",
always print time we've slept (not the actual timeout, print a "ready"
message if we've printed a "waiting" message]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/probe.c

@@ -1876,11 +1876,16 @@ static bool pci_bus_wait_crs(struct pci_bus *bus, int devfn, u32 *l,
 	 */
 	while (pci_bus_crs_vendor_id(*l)) {
 		if (delay > timeout) {
-			printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
-			       pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
-			       PCI_FUNC(devfn));
+			pr_warn("pci %04x:%02x:%02x.%d: not ready after %dms; giving up\n",
+				pci_domain_nr(bus), bus->number,
+				PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1);
+
 			return false;
 		}
+		if (delay >= 1000)
+			pr_info("pci %04x:%02x:%02x.%d: not ready after %dms; waiting\n",
+				pci_domain_nr(bus), bus->number,
+				PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1);
 
 		msleep(delay);
 		delay *= 2;
@@ -1889,6 +1894,11 @@ static bool pci_bus_wait_crs(struct pci_bus *bus, int devfn, u32 *l,
 			return false;
 	}
 
+	if (delay >= 1000)
+		pr_info("pci %04x:%02x:%02x.%d: ready after %dms\n",
+			pci_domain_nr(bus), bus->number,
+			PCI_SLOT(devfn), PCI_FUNC(devfn), delay - 1);
+
 	return true;
 }