b43: Enable PCI slow clock workaround, if needed.

Enable the PCI slow clock workaround, if we're running a PCI core rev <= 10.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43/main.c

@@ -4179,6 +4179,9 @@ static int b43_wireless_core_init(struct b43_wldev *dev)
 	}
 	if (sprom->boardflags_lo & B43_BFL_XTAL_NOSLOW)
 		hf |= B43_HF_DSCRQ; /* Disable slowclock requests from ucode. */
+	if ((bus->bustype == SSB_BUSTYPE_PCI) &&
+	    (bus->pcicore.dev->id.revision <= 10))
+		hf |= B43_HF_PCISCW; /* PCI slow clock workaround. */
 	b43_hf_write(dev, hf);
 
 	b43_set_retry_limits(dev, B43_DEFAULT_SHORT_RETRY_LIMIT,