diff --git a/[refs] b/[refs]
index 37cac8b87912..b805b5cde373 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8363c374145b69bb177ed7e658a2b22f9c64910f
+refs/heads/master: 42cd95a0603e0497e7221816bb5ddfe861ee9325
diff --git a/trunk/drivers/mmc/core/debugfs.c b/trunk/drivers/mmc/core/debugfs.c
index d96c643dde1c..35c2f85b1956 100644
--- a/trunk/drivers/mmc/core/debugfs.c
+++ b/trunk/drivers/mmc/core/debugfs.c
@@ -144,6 +144,22 @@ static int mmc_ios_show(struct seq_file *s, void *data)
 	}
 	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
 
+	switch (ios->signal_voltage) {
+	case MMC_SIGNAL_VOLTAGE_330:
+		str = "3.30 V";
+		break;
+	case MMC_SIGNAL_VOLTAGE_180:
+		str = "1.80 V";
+		break;
+	case MMC_SIGNAL_VOLTAGE_120:
+		str = "1.20 V";
+		break;
+	default:
+		str = "invalid";
+		break;
+	}
+	seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str);
+
 	return 0;
 }