media: Use designated initializers for all subdev pad ops

Structures passed to subdev pad operations are all zero-initialized when
declaring variables. In most cases, this is done with designated
initializers to initialize some of the fields to specific values, but in
a minority of cases the structures are zero-initialized by assigning
them to '{ 0 }' or '{ }'.

Improve coding style consistency by using designated initializers where
possible, always initializing the 'which' field.

Signed-off-by: Laurent Pinchart <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Reviewed-by: Tomi Valkeinen <[e-mail]>
Reviewed-by: Kieran Bingham <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/pci/cobalt/cobalt-v4l2.c

···
 {
 	struct cobalt_stream *s = video_drvdata(file);
 	struct v4l2_pix_format *pix = &f->fmt.pix;
-	struct v4l2_subdev_format sd_fmt = { 0 };
+	struct v4l2_subdev_format sd_fmt = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
 	u32 code;
 
 	if (cobalt_try_fmt_vid_out(file, priv_fh, f))
···
 	s->xfer_func = pix->xfer_func;
 	s->ycbcr_enc = pix->ycbcr_enc;
 	s->quantization = pix->quantization;
-	sd_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 	v4l2_fill_mbus_format(&sd_fmt.format, pix, code);
 	v4l2_subdev_call(s->sd, pad, set_fmt, NULL, &sd_fmt);
 	return 0;

drivers/media/platform/microchip/microchip-isc-base.c

···
 static void isc_try_fse(struct isc_device *isc,
 			struct v4l2_subdev_state *sd_state)
 {
+	struct v4l2_subdev_frame_size_enum fse = {
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+	};
 	int ret;
-	struct v4l2_subdev_frame_size_enum fse = {};
 
 	/*
 	 * If we do not know yet which format the subdev is using, we cannot
···
 		return;
 
 	fse.code = isc->try_config.sd_format->mbus_code;
-	fse.which = V4L2_SUBDEV_FORMAT_TRY;
 
 	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
 			       sd_state, &fse);

drivers/media/platform/renesas/vsp1/vsp1_drm.c

···
 					 struct vsp1_pipeline *pipe)
 {
 	struct vsp1_drm_pipeline *drm_pipe = to_vsp1_drm_pipeline(pipe);
-	struct v4l2_subdev_format format = { 0, };
+	struct v4l2_subdev_format format = {
+		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
+	};
 	int ret;
 
-	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 	format.pad = RWPF_PAD_SINK;
 	format.format.width = drm_pipe->width;
 	format.format.height = drm_pipe->height;

drivers/staging/media/deprecated/atmel/atmel-isc-base.c

···
 static void isc_try_fse(struct isc_device *isc,
 			struct v4l2_subdev_state *sd_state)
 {
+	struct v4l2_subdev_frame_size_enum fse = {
+		.which = V4L2_SUBDEV_FORMAT_TRY,
+	};
 	int ret;
-	struct v4l2_subdev_frame_size_enum fse = {};
 
 	/*
 	 * If we do not know yet which format the subdev is using, we cannot
···
 		return;
 
 	fse.code = isc->try_config.sd_format->mbus_code;
-	fse.which = V4L2_SUBDEV_FORMAT_TRY;
 
 	ret = v4l2_subdev_call(isc->current_subdev->sd, pad, enum_frame_size,
 			       sd_state, &fse);