bcma: use fallback sprom if sprom on card was not valid

Sometimes the PCIe card indicates that it has a sprom somewhere and we
are able to read the memory region, but it is empty and not valid. In
these cases we should try to use the fallback sprom as a last chance.

SVN-Revision: 33601

target/linux/brcm47xx/patches-3.3/203-bcma-use-fallback-sprom-if-sprom-on-card-was-not-val.patch

@@ -0,0 +1,15 @@
+--- a/drivers/bcma/sprom.c
++++ b/drivers/bcma/sprom.c
+@@ -591,8 +591,11 @@ int bcma_sprom_get(struct bcma_bus *bus)
+ 		bcma_chipco_bcm4331_ext_pa_lines_ctl(&bus->drv_cc, true);
+ 
+ 	err = bcma_sprom_valid(sprom);
+-	if (err)
++	if (err) {
++		bcma_warn(bus, "invalid sprom read from the PCIe card, try to use fallback sprom\n");
++		err = bcma_fill_sprom_with_fallback(bus, &bus->sprom);
+ 		goto out;
++	}
+ 
+ 	bcma_sprom_extract_r8(bus, sprom);
+