media: ov2680: Fix ov2680_set_fmt() which == V4L2_SUBDEV_FORMAT_TRY not working

ov2680_set_fmt() which == V4L2_SUBDEV_FORMAT_TRY was getting
the try_fmt v4l2_mbus_framefmt struct from the passed in sd_state
and then storing the contents of that into the return by reference
format->format struct.

While the right thing to do would be filling format->format based on
the just looked up mode and then store the results of that in
sd_state->pads[0].try_fmt .

Before the previous change introducing ov2680_fill_format() this
resulted in ov2680_set_fmt() which == V4L2_SUBDEV_FORMAT_TRY always
returning the zero-ed out sd_state->pads[0].try_fmt in format->format
breaking callers using this.

After the introduction of ov2680_fill_format() which at least
initializes sd_state->pads[0].try_fmt properly, format->format
is now always being filled with the default 800x600 mode set by
ov2680_init_cfg() independent of the actual requested mode.

Move the filling of format->format with ov2680_fill_format() to
before the if (which == V4L2_SUBDEV_FORMAT_TRY) and then store
the filled in format->format in sd_state->pads[0].try_fmt to
fix this.

Note this removes the fmt local variable because IMHO having a local
variable which points to a sub-struct of one of the function arguments
just leads to confusion when reading the code.

Fixes: 3ee47cad ("media: ov2680: Add Omnivision OV2680 sensor driver")
Acked-by: Rui Miguel Silva <rmfrfs@gmail.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/ov2680.c

@@ -603,7 +603,6 @@ static int ov2680_set_fmt(struct v4l2_subdev *sd,
 			  struct v4l2_subdev_format *format)
 {
 	struct ov2680_dev *sensor = to_ov2680_dev(sd);
-	struct v4l2_mbus_framefmt *fmt = &format->format;
 	struct v4l2_mbus_framefmt *try_fmt;
 	const struct ov2680_mode_info *mode;
 	int ret = 0;
@@ -612,14 +611,18 @@ static int ov2680_set_fmt(struct v4l2_subdev *sd,
 		return -EINVAL;
 
 	mode = v4l2_find_nearest_size(ov2680_mode_data,
-				      ARRAY_SIZE(ov2680_mode_data), width,
-				      height, fmt->width, fmt->height);
+				      ARRAY_SIZE(ov2680_mode_data),
+				      width, height,
+				      format->format.width,
+				      format->format.height);
 	if (!mode)
 		return -EINVAL;
 
+	ov2680_fill_format(sensor, &format->format, mode->width, mode->height);
+
 	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
 		try_fmt = v4l2_subdev_get_try_format(sd, sd_state, 0);
-		format->format = *try_fmt;
+		*try_fmt = format->format;
 		return 0;
 	}
 
@@ -630,8 +633,6 @@ static int ov2680_set_fmt(struct v4l2_subdev *sd,
 		goto unlock;
 	}
 
-	ov2680_fill_format(sensor, fmt, mode->width, mode->height);
-
 	sensor->current_mode = mode;
 	sensor->fmt = format->format;
 	sensor->mode_pending_changes = true;