V4L/DVB (11419): gspca - m5602-ov9650: Don't read exposure data from COM1.

ov9650: Reading the COM1 register corrupts the image.
Decrease the granularity of the exposure and limit its upper range
as setting such high values doesn't have any effect on the image.

Signed-off-by: Erik Andr?n <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/m5602/m5602_ov9650.c

@@ -75,8 +75,8 @@ const static struct ctrl ov9650_ctrls[] = {
 			.type		= V4L2_CTRL_TYPE_INTEGER,
 			.name		= "exposure",
 			.minimum	= 0x00,
-			.maximum	= 0xffff,
-			.step		= 0x1,
+			.maximum	= 0x1ff,
+			.step		= 0x4,
 			.default_value 	= EXPOSURE_DEFAULT,
 			.flags         	= V4L2_CTRL_FLAG_SLIDER
 		},
@@ -407,11 +407,6 @@ int ov9650_get_exposure(struct gspca_dev *gspca_dev, __s32 *val)
 	u8 i2c_data;
 	int err;
 
-	err = m5602_read_sensor(sd, OV9650_COM1, &i2c_data, 1);
-	if (err < 0)
-		return err;
-	*val = i2c_data & 0x03;
-
 	err = m5602_read_sensor(sd, OV9650_AECH, &i2c_data, 1);
 	if (err < 0)
 		return err;

drivers/media/video/gspca/m5602/m5602_ov9650.h

@@ -123,7 +123,7 @@
 #define GAIN_DEFAULT			0x14
 #define RED_GAIN_DEFAULT		0x70
 #define BLUE_GAIN_DEFAULT		0x20
-#define EXPOSURE_DEFAULT		0x5003
+#define EXPOSURE_DEFAULT		0x1ff
 
 /*****************************************************************************/