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SubjectRe: [PATCH v2 2/2] media: stm32: dcmi: only call s_stream on the source subdev
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Reviewed-by: Hugues FRUCHET <hugues.fruchet@foss.st.com>

On 7/21/23 14:03, Alain Volmat wrote:
> 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@foss.st.com>
> ---
> 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;
> }
>

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