Index: sys/dev/i2c/i2c_exec.c
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/i2c_exec.c,v
retrieving revision 1.9
diff -p -u -r1.9 i2c_exec.c
--- sys/dev/i2c/i2c_exec.c	12 Sep 2013 20:30:58 -0000	1.9
+++ sys/dev/i2c/i2c_exec.c	5 Mar 2015 14:20:45 -0000
@@ -110,7 +110,8 @@ iic_exec(i2c_tag_t tag, i2c_op_t op, i2c
 					cmdlen, buf, buflen, flags));
 
 	if ((len = cmdlen) != 0) {
-		if ((error = iic_initiate_xfer(tag, addr, flags)) != 0)
+		if (!ISSET(flags, I2C_F_NOSTART) &&
+		    (error = iic_initiate_xfer(tag, addr, flags)) != 0)
 			goto bad;
 		while (len--) {
 			if ((error = iic_write_byte(tag, *cmd++, flags)) != 0)
@@ -125,7 +126,8 @@ iic_exec(i2c_tag_t tag, i2c_op_t op, i2c
 			flags |= I2C_F_STOP;
 		if (I2C_OP_READ_P(op))
 			flags |= I2C_F_READ;
-		if ((error = iic_initiate_xfer(tag, addr, flags)) != 0)
+		if (!ISSET(flags, I2C_F_NOSTART) &&
+		    (error = iic_initiate_xfer(tag, addr, flags)) != 0)
 			goto bad;
 	}
 
@@ -139,6 +141,7 @@ iic_exec(i2c_tag_t tag, i2c_op_t op, i2c
 		if (I2C_OP_READ_P(op)) {
 			/* Send REPEATED START. */
 			if ((len + 1) == buflen &&
+			    !ISSET(flags, I2C_F_NOSTART) &&
 			    (error = iic_initiate_xfer(tag, addr, flags)) != 0)
 				goto bad;
 			/* NACK on last byte. */
@@ -149,6 +152,7 @@ iic_exec(i2c_tag_t tag, i2c_op_t op, i2c
 		} else  {
 			/* Maybe send START. */
 			if ((len + 1) == buflen && cmdlen == 0 &&
+			    !ISSET(flags, I2C_F_NOSTART) &&
 			    (error = iic_initiate_xfer(tag, addr, flags)) != 0)
 				goto bad;
 			if ((error = iic_write_byte(tag, *buf++, flags)) != 0)
Index: sys/dev/i2c/i2cvar.h
===================================================================
RCS file: /cvsroot/src/sys/dev/i2c/i2cvar.h,v
retrieving revision 1.8
diff -p -u -r1.8 i2cvar.h
--- sys/dev/i2c/i2cvar.h	28 Feb 2010 15:33:21 -0000	1.8
+++ sys/dev/i2c/i2cvar.h	5 Mar 2015 14:20:45 -0000
@@ -47,6 +47,7 @@
 #define	I2C_F_STOP		0x04	/* send stop after byte */
 #define	I2C_F_POLL		0x08	/* poll, don't sleep */
 #define	I2C_F_PEC		0x10	/* smbus packet error checking */
+#define	I2C_F_NOSTART		0x20	/* don't initiate xfer */
 
 struct ic_intr_list {
 	LIST_ENTRY(ic_intr_list) il_next;
Index: sys/external/bsd/drm2/linux/linux_i2c.c
===================================================================
RCS file: /cvsroot/src/sys/external/bsd/drm2/linux/linux_i2c.c,v
retrieving revision 1.2
diff -p -u -r1.2 linux_i2c.c
--- sys/external/bsd/drm2/linux/linux_i2c.c	18 Mar 2014 18:20:43 -0000	1.2
+++ sys/external/bsd/drm2/linux/linux_i2c.c	5 Mar 2015 14:20:45 -0000
@@ -110,10 +110,14 @@ linux_i2c_flags_op(uint16_t flags, bool 
 }
 
 static int
-linux_i2c_flags_flags(uint16_t flags __unused)
+linux_i2c_flags_flags(uint16_t flags)
 {
+	int f = 0;
 
-	return 0;
+	if (ISSET(flags, I2C_M_NOSTART))
+		f |= I2C_F_NOSTART;
+
+	return f;
 }
 
 const struct i2c_algorithm i2c_bit_algo = {