media: staging: media: zoran: fix various V4L2 compliance errors

This fixes several issues found with 'v4l2-compliance -s':

1) read()/write() is supported, but not reported in the capabilities
2) S_STD(G_STD()) failed: setting the same standard should just return 0.
3) G_PARM failed to set readbuffers.
4) different field values in the format vs. what v4l2_buffer reported.
5) zero the sequence number when starting streaming.
6) drop VB_USERPTR: makes no sense with dma_contig streaming.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/zoran/zoran_card.c

@@ -879,7 +879,7 @@ static int zoran_init_video_device(struct zoran *zr, struct video_device *video_
 	*video_dev = zoran_template;
 	video_dev->v4l2_dev = &zr->v4l2_dev;
 	video_dev->lock = &zr->lock;
-	video_dev->device_caps = V4L2_CAP_STREAMING | dir;
+	video_dev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_READWRITE | dir;
 
 	strscpy(video_dev->name, ZR_DEVNAME(zr), sizeof(video_dev->name));
 	/*

drivers/staging/media/zoran/zoran_driver.c

@@ -253,8 +253,6 @@ static int zoran_querycap(struct file *file, void *__fh, struct v4l2_capability
 	strscpy(cap->card, ZR_DEVNAME(zr), sizeof(cap->card));
 	strscpy(cap->driver, "zoran", sizeof(cap->driver));
 	snprintf(cap->bus_info, sizeof(cap->bus_info), "PCI:%s", pci_name(zr->pci_dev));
-	cap->device_caps = zr->video_dev->device_caps;
-	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
 	return 0;
 }
 
@@ -580,6 +578,9 @@ static int zoran_s_std(struct file *file, void *__fh, v4l2_std_id std)
 	struct zoran *zr = video_drvdata(file);
 	int res = 0;
 
+	if (zr->norm == std)
+		return 0;
+
 	if (zr->running != ZORAN_MAP_MODE_NONE)
 		return -EBUSY;
 
@@ -737,6 +738,7 @@ static int zoran_g_parm(struct file *file, void *priv, struct v4l2_streamparm *p
 	if (parm->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 		return -EINVAL;
 
+	parm->parm.capture.readbuffers = 9;
 	return 0;
 }
 
@@ -867,6 +869,10 @@ int zr_set_buf(struct zoran *zr)
 		vbuf = &buf->vbuf;
 
 		buf->vbuf.field = V4L2_FIELD_INTERLACED;
+		if (BUZ_MAX_HEIGHT < (zr->v4l_settings.height * 2))
+			buf->vbuf.field = V4L2_FIELD_INTERLACED;
+		else
+			buf->vbuf.field = V4L2_FIELD_TOP;
 		vb2_set_plane_payload(&buf->vbuf.vb2_buf, 0, zr->buffer_size);
 		vb2_buffer_done(&buf->vbuf.vb2_buf, VB2_BUF_STATE_DONE);
 		zr->inuse[0] = NULL;
@@ -927,6 +933,7 @@ static int zr_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
 		zr->stat_com[j] = cpu_to_le32(1);
 		zr->inuse[j] = NULL;
 	}
+	zr->vbseq = 0;
 
 	if (zr->map_mode != ZORAN_MAP_MODE_RAW) {
 		pci_info(zr->pci_dev, "START JPG\n");
@@ -1017,7 +1024,7 @@ int zoran_queue_init(struct zoran *zr, struct vb2_queue *vq, int dir)
 	vq->dev = &zr->pci_dev->dev;
 	vq->type = dir;
 
-	vq->io_modes = VB2_USERPTR | VB2_DMABUF | VB2_MMAP | VB2_READ | VB2_WRITE;
+	vq->io_modes = VB2_DMABUF | VB2_MMAP | VB2_READ | VB2_WRITE;
 	vq->drv_priv = zr;
 	vq->buf_struct_size = sizeof(struct zr_buffer);
 	vq->ops = &zr_video_qops;