media: ov5640: fix exposure regression

Symptom was black image when capturing HD or 5Mp picture
due to manual exposure set to 1 while it was intended to
set autoexposure to "manual", fix this.

Fixes: bf4a4b51 ("media: ov5640: Don't force the auto exposure state at start time").
Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/ov5640.c

@@ -959,6 +959,12 @@ static int ov5640_load_regs(struct ov5640_dev *sensor,
 	return ov5640_set_timings(sensor, mode);
 }
 
+static int ov5640_set_autoexposure(struct ov5640_dev *sensor, bool on)
+{
+	return ov5640_mod_reg(sensor, OV5640_REG_AEC_PK_MANUAL,
+			      BIT(0), on ? 0 : BIT(0));
+}
+
 /* read exposure, in number of line periods */
 static int ov5640_get_exposure(struct ov5640_dev *sensor)
 {
@@ -1603,7 +1609,7 @@ static int ov5640_set_mode_exposure_calc(struct ov5640_dev *sensor,
  */
 static int ov5640_set_mode_direct(struct ov5640_dev *sensor,
 				  const struct ov5640_mode_info *mode,
-				  s32 exposure)
+				  bool auto_exp)
 {
 	int ret;
 
@@ -1620,7 +1626,8 @@ static int ov5640_set_mode_direct(struct ov5640_dev *sensor,
 	if (ret)
 		return ret;
 
-	return __v4l2_ctrl_s_ctrl(sensor->ctrls.auto_exp, exposure);
+	return __v4l2_ctrl_s_ctrl(sensor->ctrls.auto_exp, auto_exp ?
+				  V4L2_EXPOSURE_AUTO : V4L2_EXPOSURE_MANUAL);
 }
 
 static int ov5640_set_mode(struct ov5640_dev *sensor,
@@ -1628,7 +1635,7 @@ static int ov5640_set_mode(struct ov5640_dev *sensor,
 {
 	const struct ov5640_mode_info *mode = sensor->current_mode;
 	enum ov5640_downsize_mode dn_mode, orig_dn_mode;
-	s32 exposure;
+	bool auto_exp =  sensor->ctrls.auto_exp->val == V4L2_EXPOSURE_AUTO;
 	int ret;
 
 	dn_mode = mode->dn_mode;
@@ -1639,8 +1646,7 @@ static int ov5640_set_mode(struct ov5640_dev *sensor,
 	if (ret)
 		return ret;
 
-	exposure = sensor->ctrls.auto_exp->val;
-	ret = ov5640_set_exposure(sensor, V4L2_EXPOSURE_MANUAL);
+	ret = ov5640_set_autoexposure(sensor, false);
 	if (ret)
 		return ret;
 
@@ -1656,7 +1662,7 @@ static int ov5640_set_mode(struct ov5640_dev *sensor,
 		 * change inside subsampling or scaling
 		 * download firmware directly
 		 */
-		ret = ov5640_set_mode_direct(sensor, mode, exposure);
+		ret = ov5640_set_mode_direct(sensor, mode, auto_exp);
 	}
 
 	if (ret < 0)