bcma: add extra sprom check

This check is needed on the BCM43224 device as it says in the
capabilities it has an sprom but is extra check says it has not.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/bcma/sprom.c

@@ -250,6 +250,7 @@ int bcma_sprom_get(struct bcma_bus *bus)
 {
 	u16 offset;
 	u16 *sprom;
+	u32 sromctrl;
 	int err = 0;
 
 	if (!bus->drv_cc.core)
@@ -258,6 +259,12 @@ int bcma_sprom_get(struct bcma_bus *bus)
 	if (!(bus->drv_cc.capabilities & BCMA_CC_CAP_SPROM))
 		return -ENOENT;
 
+	if (bus->drv_cc.core->id.rev >= 32) {
+		sromctrl = bcma_read32(bus->drv_cc.core, BCMA_CC_SROM_CONTROL);
+		if (!(sromctrl & BCMA_CC_SROM_CONTROL_PRESENT))
+			return -ENOENT;
+	}
+
 	sprom = kcalloc(SSB_SPROMSIZE_WORDS_R4, sizeof(u16),
 			GFP_KERNEL);
 	if (!sprom)