media: i2c: ov9282: Action CID_VBLANK when set.

Programming the sensor with TIMING_VTS (aka LPFR) was done
when triggered by a change in exposure or gain, but not
when V4L2_CID_VBLANK was changed. Dynamic frame rate
changes could therefore not be achieved.

Separate out programming TIMING_VTS so that it is triggered
by set_ctrl(V4L2_CID_VBLANK)
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov9282.c

@@ -417,22 +417,15 @@ static int ov9282_update_controls(struct ov9282 *ov9282,
  */
 static int ov9282_update_exp_gain(struct ov9282 *ov9282, u32 exposure, u32 gain)
 {
-	u32 lpfr;
 	int ret;
 
-	lpfr = ov9282->vblank + ov9282->cur_mode->height;
-
-	dev_dbg(ov9282->dev, "Set exp %u, analog gain %u, lpfr %u",
-		exposure, gain, lpfr);
+	dev_dbg(ov9282->dev, "Set exp %u, analog gain %u",
+		exposure, gain);
 
 	ret = ov9282_write_reg(ov9282, OV9282_REG_HOLD, 1, 1);
 	if (ret)
 		return ret;
 
-	ret = ov9282_write_reg(ov9282, OV9282_REG_LPFR, 2, lpfr);
-	if (ret)
-		goto error_release_group_hold;
-
 	ret = ov9282_write_reg(ov9282, OV9282_REG_EXPOSURE, 3, exposure << 4);
 	if (ret)
 		goto error_release_group_hold;
@@ -463,6 +456,7 @@ static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
 		container_of(ctrl->handler, struct ov9282, ctrl_handler);
 	u32 analog_gain;
 	u32 exposure;
+	u32 lpfr;
 	int ret;
 
 	switch (ctrl->id) {
@@ -480,11 +474,14 @@ static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
 					       OV9282_EXPOSURE_OFFSET,
 					       1, OV9282_EXPOSURE_DEFAULT);
 		break;
-	case V4L2_CID_EXPOSURE:
+	}
+
 	/* Set controls only if sensor is in power on state */
 	if (!pm_runtime_get_if_in_use(ov9282->dev))
 		return 0;
 
+	switch (ctrl->id) {
+	case V4L2_CID_EXPOSURE:
 		exposure = ctrl->val;
 		analog_gain = ov9282->again_ctrl->val;
 
@@ -492,15 +489,18 @@ static int ov9282_set_ctrl(struct v4l2_ctrl *ctrl)
 			exposure, analog_gain);
 
 		ret = ov9282_update_exp_gain(ov9282, exposure, analog_gain);
-
-		pm_runtime_put(ov9282->dev);
-
+		break;
+	case V4L2_CID_VBLANK:
+		lpfr = ov9282->vblank + ov9282->cur_mode->height;
+		ret = ov9282_write_reg(ov9282, OV9282_REG_LPFR, 2, lpfr);
 		break;
 	default:
 		dev_err(ov9282->dev, "Invalid control %d", ctrl->id);
 		ret = -EINVAL;
 	}
 
+	pm_runtime_put(ov9282->dev);
+
 	return ret;
 }