sun60iw2: allow rfkill SDIO WiFi rescans

bsp/drivers/mmc/sunxi-mmc-export.c

@@ -62,6 +62,13 @@ void sunxi_mmc_rescan_card(unsigned id)
 		return;
 	}
 
+	/*
+	 * WiFi modules are described as non-removable SDIO devices, but their
+	 * power can be controlled later by rfkill. If the first boot-time scan
+	 * runs while the module is still off, MMC core marks the host as already
+	 * scanned and ignores later rescans unless this flag is cleared.
+	 */
+	sunxi_hosts[id]->mmc->rescan_entered = 0;
 	mmc_detect_change(sunxi_hosts[id]->mmc, 0);
 }
 EXPORT_SYMBOL_GPL(sunxi_mmc_rescan_card);