Avoid calling s_stream on each subdev until reaching the sensor and
instead call s_stream on the source subdev only (which will in turn
do whatever needed to start the stream).
Signed-off-by: Alain Volmat <alain.volmat@xxxxxxxxxxx>
---
drivers/media/platform/st/stm32/stm32-dcmi.c | 63 +++++---------------
1 file changed, 14 insertions(+), 49 deletions(-)
diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c
index dad6e22e4ce4..ac8a5031dce6 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmi.c
@@ -134,6 +134,7 @@ struct stm32_dcmi {
struct video_device *vdev;
struct v4l2_async_notifier notifier;
struct v4l2_subdev *source;
+ struct v4l2_subdev *s_subdev;
struct v4l2_format fmt;
struct v4l2_rect crop;
bool do_crop;
@@ -692,51 +693,6 @@ static int dcmi_pipeline_s_fmt(struct stm32_dcmi *dcmi,
return 0;
}
-static int dcmi_pipeline_s_stream(struct stm32_dcmi *dcmi, int state)
-{
- struct media_entity *entity = &dcmi->vdev->entity;
- struct v4l2_subdev *subdev;
- struct media_pad *pad;
- int ret;
-
- /* Start/stop all entities within pipeline */
- while (1) {
- pad = &entity->pads[0];
- if (!(pad->flags & MEDIA_PAD_FL_SINK))
- break;
-
- pad = media_pad_remote_pad_first(pad);
- if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
- break;
-
- entity = pad->entity;
- subdev = media_entity_to_v4l2_subdev(entity);
-
- ret = v4l2_subdev_call(subdev, video, s_stream, state);
- if (ret < 0 && ret != -ENOIOCTLCMD) {
- dev_err(dcmi->dev, "%s: \"%s\" failed to %s streaming (%d)\n",
- __func__, subdev->name,
- state ? "start" : "stop", ret);
- return ret;
- }
-
- dev_dbg(dcmi->dev, "\"%s\" is %s\n",
- subdev->name, state ? "started" : "stopped");
- }
-
- return 0;
-}
-
-static int dcmi_pipeline_start(struct stm32_dcmi *dcmi)
-{
- return dcmi_pipeline_s_stream(dcmi, 1);
-}
-
-static void dcmi_pipeline_stop(struct stm32_dcmi *dcmi)
-{
- dcmi_pipeline_s_stream(dcmi, 0);
-}
-
static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
@@ -758,9 +714,12 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
goto err_pm_put;
}
- ret = dcmi_pipeline_start(dcmi);
- if (ret)
+ ret = v4l2_subdev_call(dcmi->s_subdev, video, s_stream, 1);
+ if (ret < 0) {
+ dev_err(dcmi->dev, "%s: Failed to start source subdev, error (%d)\n",
+ __func__, ret);
goto err_media_pipeline_stop;
+ }
spin_lock_irq(&dcmi->irqlock);
@@ -862,7 +821,7 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count)
return 0;
err_pipeline_stop:
- dcmi_pipeline_stop(dcmi);
+ v4l2_subdev_call(dcmi->s_subdev, video, s_stream, 0);
err_media_pipeline_stop:
video_device_pipeline_stop(dcmi->vdev);
@@ -889,8 +848,12 @@ static void dcmi_stop_streaming(struct vb2_queue *vq)
{
struct stm32_dcmi *dcmi = vb2_get_drv_priv(vq);
struct dcmi_buf *buf, *node;
+ int ret;
- dcmi_pipeline_stop(dcmi);
+ ret = v4l2_subdev_call(dcmi->s_subdev, video, s_stream, 0);
+ if (ret < 0)
+ dev_err(dcmi->dev, "%s: Failed to stop source subdev, error (%d)\n",
+ __func__, ret);
video_device_pipeline_stop(dcmi->vdev);
@@ -1876,6 +1839,8 @@ static int dcmi_graph_notify_bound(struct v4l2_async_notifier *notifier,
dev_dbg(dcmi->dev, "DCMI is now linked to \"%s\"\n",
subdev->name);
+ dcmi->s_subdev = subdev;
+
return ret;
}
