diff --git a/[refs] b/[refs]
index 54fb3e52a657..ef5117d26e13 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 693e5e2025278d90e1427f037e5ec8ea1ec7d5c4
+refs/heads/master: 2a0fe914a38745f5b03534c4e4f4056cbd6978b8
diff --git a/trunk/drivers/mmc/core/sdio.c b/trunk/drivers/mmc/core/sdio.c
index 13d0e95380ab..41c5fd8848f4 100644
--- a/trunk/drivers/mmc/core/sdio.c
+++ b/trunk/drivers/mmc/core/sdio.c
@@ -218,6 +218,12 @@ static int sdio_enable_wide(struct mmc_card *card)
 	if (ret)
 		return ret;
 
+	if ((ctrl & SDIO_BUS_WIDTH_MASK) == SDIO_BUS_WIDTH_RESERVED)
+		pr_warning("%s: SDIO_CCCR_IF is invalid: 0x%02x\n",
+			   mmc_hostname(card->host), ctrl);
+
+	/* set as 4-bit bus width */
+	ctrl &= ~SDIO_BUS_WIDTH_MASK;
 	ctrl |= SDIO_BUS_WIDTH_4BIT;
 
 	ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_IF, ctrl, NULL);
diff --git a/trunk/include/linux/mmc/sdio.h b/trunk/include/linux/mmc/sdio.h
index c9fe66c58f8f..17446d3c3602 100644
--- a/trunk/include/linux/mmc/sdio.h
+++ b/trunk/include/linux/mmc/sdio.h
@@ -98,7 +98,9 @@
 
 #define SDIO_CCCR_IF		0x07	/* bus interface controls */
 
+#define  SDIO_BUS_WIDTH_MASK	0x03	/* data bus width setting */
 #define  SDIO_BUS_WIDTH_1BIT	0x00
+#define  SDIO_BUS_WIDTH_RESERVED 0x01
 #define  SDIO_BUS_WIDTH_4BIT	0x02
 #define  SDIO_BUS_ECSI		0x20	/* Enable continuous SPI interrupt */
 #define  SDIO_BUS_SCSI		0x40	/* Support continuous SPI interrupt */