This patch corrects the link_notify handler to support more complex
pipelines, including fimc-lite and fimc-is entities.
After the FIMC-IS driver addition the assumptions made in the link_notify
callback are no longer valid, e.g. the link between fimc-lite subdev and
its video node is not immutable any more and there is more subdevs than
just sensor, MIPI-CSIS and FIMC(-LITE).
The graph is now walked and for each video node found a media pipeline
which ends at this node is disabled/enabled (the subdevs are powered
on/off).
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
Changes since v1:
- check link->flags instead of the flags argument of link_notify handler
to see if the pipelines' should be powered back on.
---
drivers/media/platform/exynos4-is/media-dev.c | 103 +++++++++++++++++++-----
1 files changed, 81 insertions(+), 22 deletions(-)
diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
index 045a6ae..ec79ebb 100644
--- a/drivers/media/platform/exynos4-is/media-dev.c
+++ b/drivers/media/platform/exynos4-is/media-dev.c
@@ -1287,39 +1287,98 @@ int fimc_md_set_camclk(struct v4l2_subdev *sd, bool on)
return __fimc_md_set_camclk(fmd, si, on);
}
-static int fimc_md_link_notify(struct media_link *link, u32 flags,
- unsigned int notification)
+static int __fimc_md_modify_pipeline(struct media_entity *entity, bool enable)
{
- struct media_entity *sink = link->sink->entity;
struct exynos_video_entity *ve;
+ struct fimc_pipeline *p;
struct video_device *vdev;
- struct fimc_pipeline *pipeline;
- int i, ret = 0;
+ int ret;
- if (media_entity_type(sink) != MEDIA_ENT_T_DEVNODE_V4L ||
- notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH)
+ vdev = media_entity_to_video_device(entity);
+ if (vdev->entity.use_count == 0)
return 0;
- vdev = media_entity_to_video_device(sink);
ve = vdev_to_exynos_video_entity(vdev);
- pipeline = to_fimc_pipeline(ve->pipe);
+ p = to_fimc_pipeline(ve->pipe);
+ /*
+ * Nothing to do if we are disabling the pipeline, some link
+ * has been disconnected and p->subdevs array is cleared now.
+ */
+ if (!enable && p->subdevs[IDX_SENSOR] == NULL)
+ return 0;
- if (!(link->flags & MEDIA_LNK_FL_ENABLED) && pipeline->subdevs[IDX_SENSOR]) {
- if (sink->use_count > 0)
- ret = __fimc_pipeline_close(ve->pipe);
+ if (enable)
+ ret = __fimc_pipeline_open(ve->pipe, entity, true);
+ else
+ ret = __fimc_pipeline_close(ve->pipe);
- for (i = 0; i < IDX_MAX; i++)
- pipeline->subdevs[i] = NULL;
- } else if (sink->use_count > 0) {
- /*
- * Link activation. Enable power of pipeline elements only if
- * the pipeline is already in use, i.e. its video node is open.
- * Recreate the controls destroyed during the link deactivation.
- */
- ret = __fimc_pipeline_open(ve->pipe, sink, true);
+ if (ret == 0 && !enable)
+ memset(p->subdevs, 0, sizeof(p->subdevs));
+
+ return ret;
+}
+
+/* Locking: called with entity->parent->graph_mutex mutex held. */
+static int __fimc_md_modify_pipelines(struct media_entity *entity, bool enable)
+{
+ struct media_entity *entity_err = entity;
+ struct media_entity_graph graph;
+ int ret;
+
+ /*
+ * Walk current graph and call the pipeline open/close routine for each
+ * opened video node that belongs to the graph of entities connected
+ * through active links. This is needed as we cannot power on/off the
+ * subdevs in random order.
+ */
+ media_entity_graph_walk_start(&graph, entity);
+
+ while ((entity = media_entity_graph_walk_next(&graph))) {
+ if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
+ continue;
+
+ ret = __fimc_md_modify_pipeline(entity, enable);
+
+ if (ret < 0)
+ goto err;
+ }
+
+ return 0;
+ err:
+ media_entity_graph_walk_start(&graph, entity_err);
+
+ while ((entity_err = media_entity_graph_walk_next(&graph))) {
+ if (media_entity_type(entity_err) != MEDIA_ENT_T_DEVNODE)
+ continue;
+
+ __fimc_md_modify_pipeline(entity_err, !enable);
+
+ if (entity_err == entity)
+ break;
+ }
+
+ return ret;
+}
+
+static int fimc_md_link_notify(struct media_link *link, unsigned int flags,
+ unsigned int notification)
+{
+ struct media_entity *sink = link->sink->entity;
+ int ret = 0;
+
+ /* Before link disconnection */
+ if (notification == MEDIA_DEV_NOTIFY_PRE_LINK_CH) {
+ if (!(flags & MEDIA_LNK_FL_ENABLED))
+ ret = __fimc_md_modify_pipelines(sink, false);
+ else
+ ; /* TODO: Link state change validation */
+ /* After link activation */
+ } else if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
+ (link->flags & MEDIA_LNK_FL_ENABLED)) {
+ ret = __fimc_md_modify_pipelines(sink, true);
}
- return ret ? -EPIPE : ret;
+ return ret ? -EPIPE : 0;
}
static ssize_t fimc_md_sysfs_show(struct device *dev,
--
1.7.4.1
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