media: atomisp: Add atomisp_s_sensor_power() helper

Since the atomisp driver only supports 1 stream / only has 1 asd now,
there is no longer a need to track which stream owns the sensor.

So the asd owner-pointer of struct atomisp_input_subdev can be dropped,
replace this with a simple camera_on boolean and add a new
atomisp_s_sensor_power() helper which takes care of avoiding unbalanced
s_power() subdev calls as well as takes care of handling the special
-ENOIOCTLCMD return for subdevs which don't implement s_power().
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -3722,6 +3722,23 @@ void atomisp_get_padding(struct atomisp_device *isp, u32 width, u32 height,
 	*padding_h = max_t(u32, *padding_h, min_pad_h);
 }
 
+int atomisp_s_sensor_power(struct atomisp_device *isp, unsigned int input, bool on)
+{
+	int ret;
+
+	if (isp->inputs[input].camera_on == on)
+		return 0;
+
+	ret = v4l2_subdev_call(isp->inputs[input].camera, core, s_power, on);
+	if (ret && ret != -ENOIOCTLCMD) {
+		dev_err(isp->dev, "Error setting sensor power %d: %d\n", on, ret);
+		return ret;
+	}
+
+	isp->inputs[input].camera_on = on;
+	return 0;
+}
+
 static int atomisp_set_sensor_crop_and_fmt(struct atomisp_device *isp,
 					   struct v4l2_mbus_framefmt *ffmt,
 					   int which)

drivers/staging/media/atomisp/pci/atomisp_cmd.h

@@ -241,6 +241,9 @@ int atomisp_compare_grid(struct atomisp_sub_device *asd,
 void atomisp_get_padding(struct atomisp_device *isp, u32 width, u32 height,
 			 u32 *padding_w, u32 *padding_h);
 
+/* Set sensor power (no-op if already on/off) */
+int atomisp_s_sensor_power(struct atomisp_device *isp, unsigned int input, bool on);
+
 /* This function looks up the closest available resolution. */
 int atomisp_try_fmt(struct atomisp_device *isp, struct v4l2_pix_format *f,
 		    const struct atomisp_format_bridge **fmt_ret,

drivers/staging/media/atomisp/pci/atomisp_fops.c

@@ -445,12 +445,8 @@ const struct vb2_ops atomisp_vb2_ops = {
 
 static void atomisp_dev_init_struct(struct atomisp_device *isp)
 {
-	unsigned int i;
-
 	isp->isp_fatal_error = false;
 
-	for (i = 0; i < isp->input_cnt; i++)
-		isp->inputs[i].asd = NULL;
 	/*
 	 * For Merrifield, frequency is scalable.
 	 * After boot-up, the default frequency is 200MHz.
@@ -584,15 +580,7 @@ static int atomisp_release(struct file *file)
 	atomisp_css_free_stat_buffers(asd);
 	atomisp_free_internal_buffers(asd);
 
-	if (isp->inputs[asd->input_curr].asd == asd) {
-		ret = v4l2_subdev_call(isp->inputs[asd->input_curr].camera,
-				       core, s_power, 0);
-		if (ret && ret != -ENOIOCTLCMD)
-			dev_warn(isp->dev, "Failed to power-off sensor\n");
-
-		/* clear the asd field to show this camera is not used */
-		isp->inputs[asd->input_curr].asd = NULL;
-	}
+	atomisp_s_sensor_power(isp, asd->input_curr, 0);
 
 	atomisp_destroy_pipes_stream(asd);
 

drivers/staging/media/atomisp/pci/atomisp_internal.h

@@ -127,17 +127,13 @@ struct atomisp_input_subdev {
 	u32 code; /* MEDIA_BUS_FMT_* */
 	bool binning_support;
 	bool crop_support;
+	bool camera_on;
 	struct v4l2_subdev *camera;
 	/* Sensor rects for sensors which support crop */
 	struct v4l2_rect native_rect;
 	struct v4l2_rect active_rect;
 	/* Sensor state for which == V4L2_SUBDEV_FORMAT_TRY calls */
 	struct v4l2_subdev_state *try_sd_state;
-	/*
-	 * To show this resource is used by
-	 * which stream, in ISP multiple stream mode
-	 */
-	struct atomisp_sub_device *asd;
 };
 
 enum atomisp_dfs_mode {

drivers/staging/media/atomisp/pci/atomisp_ioctl.c

@@ -469,28 +469,15 @@ static int atomisp_s_input(struct file *file, void *fh, unsigned int input)
 	}
 
 	/* power off the current owned sensor, as it is not used this time */
-	if (isp->inputs[asd->input_curr].asd == asd &&
-	    asd->input_curr != input) {
-		ret = v4l2_subdev_call(isp->inputs[asd->input_curr].camera,
-				       core, s_power, 0);
-		if (ret && ret != -ENOIOCTLCMD)
-			dev_warn(isp->dev,
-				 "Failed to power-off sensor\n");
-		/* clear the asd field to show this camera is not used */
-		isp->inputs[asd->input_curr].asd = NULL;
-	}
+	if (input != isp->asd.input_curr)
+		atomisp_s_sensor_power(isp, isp->asd.input_curr, 0);
 
 	/* powe on the new sensor */
-	ret = v4l2_subdev_call(isp->inputs[input].camera, core, s_power, 1);
-	if (ret && ret != -ENOIOCTLCMD) {
-		dev_err(isp->dev, "Failed to power-on sensor\n");
+	ret = atomisp_s_sensor_power(isp, input, 1);
+	if (ret)
 		return ret;
-	}
 
 	asd->input_curr = input;
-	/* mark this camera is used by the current stream */
-	isp->inputs[input].asd = asd;
-
 	return 0;
 }