diff --git a/[refs] b/[refs]
index 23be9c48bdaf..784739789198 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d97fbbed6e5bb37df75be8993bb0c61adb7d3558
+refs/heads/master: d39ec6ce34f130d582880d1f3cbe2b38e723cafe
diff --git a/trunk/drivers/tty/serial/sh-sci.c b/trunk/drivers/tty/serial/sh-sci.c
index 3bea91b3a6f1..cd1379235f13 100644
--- a/trunk/drivers/tty/serial/sh-sci.c
+++ b/trunk/drivers/tty/serial/sh-sci.c
@@ -1465,12 +1465,17 @@ static void sci_stop_rx(struct uart_port *port)
 
 static void sci_enable_ms(struct uart_port *port)
 {
-	/* Nothing here yet .. */
+	/*
+	 * Not supported by hardware, always a nop.
+	 */
 }
 
 static void sci_break_ctl(struct uart_port *port, int break_state)
 {
-	/* Nothing here yet .. */
+	/*
+	 * Not supported by hardware. Most parts couple break and rx
+	 * interrupts together, with break detection always enabled.
+	 */
 }
 
 #ifdef CONFIG_SERIAL_SH_SCI_DMA