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[media] exynos4-is: Extend link_notify handler to support fimc-is/lite pipelines 

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callback are no longer valid, e.g. the link between fimc-lite subdev and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@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sylwester Nawrocki 2013-05-31 10:37:27 -03:00 committed by Mauro Carvalho Chehab
parent 813f5c0ac5
commit d3775fa76b
1 changed files with 81 additions and 22 deletions
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103
drivers/media/platform/exynos4-is/media-dev.c
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@ -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 ret ? -EPIPE : ret;
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 : 0;
}
static ssize_t fimc_md_sysfs_show(struct device *dev,