media: i2c: imx415: Replace streaming flag with runtime PM check

The streaming flag in the driver private structure is used for the sole
purpose of gating register writes when setting a V4L2 control. This is
better handled by checking if the sensor is powered up using the runtime
PM API. Do so and drop the streaming flag.

Signed-off-by: Laurent Pinchart <[e-mail]>
[Sakari Ailus: Runtime PM put when setting analgue gain.]
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/i2c/imx415.c

···
 
 	const struct imx415_clk_params *clk_params;
 
-	bool streaming;
-
 	struct v4l2_subdev subdev;
 	struct media_pad pad;
 
···
 	struct v4l2_subdev_state *state;
 	unsigned int vmax;
 	unsigned int flip;
+	int ret;
 
-	if (!sensor->streaming)
+	if (!pm_runtime_get_if_in_use(sensor->dev))
 		return 0;
 
 	state = v4l2_subdev_get_locked_active_state(&sensor->subdev);
···
 		/* clamp the exposure value to VMAX. */
 		vmax = format->height + sensor->vblank->cur.val;
 		ctrl->val = min_t(int, ctrl->val, vmax);
-		return imx415_write(sensor, IMX415_SHR0, vmax - ctrl->val);
+		ret = imx415_write(sensor, IMX415_SHR0, vmax - ctrl->val);
+		break;
 
 	case V4L2_CID_ANALOGUE_GAIN:
 		/* analogue gain in 0.3 dB step size */
-		return imx415_write(sensor, IMX415_GAIN_PCG_0, ctrl->val);
+		ret = imx415_write(sensor, IMX415_GAIN_PCG_0, ctrl->val);
+		break;
 
 	case V4L2_CID_HFLIP:
 	case V4L2_CID_VFLIP:
 		flip = (sensor->hflip->val << IMX415_HREVERSE_SHIFT) |
 		       (sensor->vflip->val << IMX415_VREVERSE_SHIFT);
-		return imx415_write(sensor, IMX415_REVERSE, flip);
+		ret = imx415_write(sensor, IMX415_REVERSE, flip);
+		break;
 
 	case V4L2_CID_TEST_PATTERN:
-		return imx415_set_testpattern(sensor, ctrl->val);
+		ret = imx415_set_testpattern(sensor, ctrl->val);
+		break;
 
 	default:
-		return -EINVAL;
+		ret = -EINVAL;
+		break;
 	}
+
+	pm_runtime_put(sensor->dev);
+
+	return ret;
 }
 
 static const struct v4l2_ctrl_ops imx415_ctrl_ops = {
···
 		pm_runtime_mark_last_busy(sensor->dev);
 		pm_runtime_put_autosuspend(sensor->dev);
 
-		sensor->streaming = false;
-
 		goto unlock;
 	}
 
···
 	ret = imx415_setup(sensor, state);
 	if (ret)
 		goto err_pm;
-
-	/*
-	 * Set streaming to true to ensure __v4l2_ctrl_handler_setup() will set
-	 * the controls. The flag is reset to false further down if an error
-	 * occurs.
-	 */
-	sensor->streaming = true;
 
 	ret = __v4l2_ctrl_handler_setup(&sensor->ctrls);
 	if (ret < 0)
···
 	 * likely has no other chance to recover.
 	 */
 	pm_runtime_put_sync(sensor->dev);
-	sensor->streaming = false;
 
 	goto unlock;
 }