[media] mt9m111: move lastpage to struct mt9m111 for multi instances

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/mt9m111.c

@@ -184,6 +184,7 @@ struct mt9m111 {
 	struct mutex power_lock; /* lock to protect power_count */
 	int power_count;
 	const struct mt9m111_datafmt *fmt;
+	int lastpage;	/* PageMap cache value */
 	unsigned int gain;
 	unsigned char autoexposure;
 	unsigned char datawidth;
@@ -202,17 +203,17 @@ static int reg_page_map_set(struct i2c_client *client, const u16 reg)
 {
 	int ret;
 	u16 page;
-	static int lastpage = -1;	/* PageMap cache value */
+	struct mt9m111 *mt9m111 = to_mt9m111(client);
 
 	page = (reg >> 8);
-	if (page == lastpage)
+	if (page == mt9m111->lastpage)
 		return 0;
 	if (page > 2)
 		return -EINVAL;
 
 	ret = i2c_smbus_write_word_data(client, MT9M111_PAGE_MAP, swab16(page));
 	if (!ret)
-		lastpage = page;
+		mt9m111->lastpage = page;
 	return ret;
 }
 
@@ -932,6 +933,8 @@ static int mt9m111_video_probe(struct soc_camera_device *icd,
 	BUG_ON(!icd->parent ||
 	       to_soc_camera_host(icd->parent)->nr != icd->iface);
 
+	mt9m111->lastpage = -1;
+
 	mt9m111->autoexposure = 1;
 	mt9m111->autowhitebalance = 1;