[media] V4L: mx3_camera: implement .stop_streaming()

The .stop_streaming() videobuf2 operation has to be implemented to
guarantee, that video buffers are not written to after a STREAMOFF.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/media/video/mx3_camera.c b/drivers/media/video/mx3_camera.c
index 502e2a40964c..8630c0c9e60a 100644
--- a/drivers/media/video/mx3_camera.c
+++ b/drivers/media/video/mx3_camera.c
@@ -400,6 +400,35 @@ static int mx3_videobuf_init(struct vb2_buffer *vb)
         return 0;
 }
 
+static int mx3_stop_streaming(struct vb2_queue *q)
+{
+        struct soc_camera_device *icd = soc_camera_from_vb2q(q);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
+        struct mx3_camera_dev *mx3_cam = ici->priv;
+        struct idmac_channel *ichan = mx3_cam->idmac_channel[0];
+        struct dma_chan *chan;
+        struct mx3_camera_buffer *buf, *tmp;
+        unsigned long flags;
+
+        if (ichan) {
+                chan = &ichan->dma_chan;
+                chan->device->device_control(chan, DMA_TERMINATE_ALL, 0);
+        }
+
+        spin_lock_irqsave(&mx3_cam->lock, flags);
+
+        mx3_cam->active = NULL;
+
+        list_for_each_entry_safe(buf, tmp, &mx3_cam->capture, queue) {
+                buf->state = CSI_BUF_NEEDS_INIT;
+                list_del_init(&buf->queue);
+        }
+
+        spin_unlock_irqrestore(&mx3_cam->lock, flags);
+
+        return 0;
+}
+
 static struct vb2_ops mx3_videobuf_ops = {
         .queue_setup    = mx3_videobuf_setup,
         .buf_prepare    = mx3_videobuf_prepare,
@@ -408,6 +437,7 @@ static struct vb2_ops mx3_videobuf_ops = {
         .buf_init       = mx3_videobuf_init,
         .wait_prepare   = soc_camera_unlock,
         .wait_finish    = soc_camera_lock,
+        .stop_streaming = mx3_stop_streaming,
 };
 
 static int mx3_camera_init_videobuf(struct vb2_queue *q,