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| author |   André Almeida <andrealmeid@collabora.com> | 2019-06-15 22:09:58 -0400 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-06-21 17:17:25 -0400 |
| commit | bfa69bdf342b723a065528acdb217d13a40e40b6 (patch) | |
| tree | f101f0caa3fa6e6256424a222bf34d1695a06e1d /drivers/media | |
| parent | media: video-i2c: use V4L2_FRACT_COMPARE (diff) | |
| download | linux-dev-bfa69bdf342b723a065528acdb217d13a40e40b6.tar.xz linux-dev-bfa69bdf342b723a065528acdb217d13a40e40b6.zip | |
media: vimc: stream: add missing function documentation
Add comments at vimc_streamer_s_stream and vimc_streamer_thread, making
the vimc-stream totally documented.
Signed-off-by: André Almeida <andrealmeid@collabora.com>
[hverkuil-cisco@xs4all.nl: fix typo: in a fixed framerate -> at a fixed framerate]
[hverkuil-cisco@xs4all.nl: fix typo: stops the thread -> stop the thread]
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/platform/vimc/vimc-streamer.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/media/platform/vimc/vimc-streamer.c b/drivers/media/platform/vimc/vimc-streamer.c index 236ade38f1da..3b3f36357a0e 100644 --- a/drivers/media/platform/vimc/vimc-streamer.c +++ b/drivers/media/platform/vimc/vimc-streamer.c @@ -122,6 +122,14 @@ static int vimc_streamer_pipeline_init(struct vimc_stream *stream, return -EINVAL; } +/* + * vimc_streamer_thread - process frames through the pipeline + * + * @data: vimc_stream struct of the current stream + * + * From the source to the sink, gets a frame from each subdevice and send to + * the next one of the pipeline at a fixed framerate. + */ static int vimc_streamer_thread(void *data) { struct vimc_stream *stream = data; @@ -149,6 +157,20 @@ static int vimc_streamer_thread(void *data) return 0; } +/* + * vimc_streamer_s_stream - start/stop the streaming on the media pipeline + * + * @stream: the pointer to the stream structure of the current stream + * @ved: pointer to the vimc entity of the entity of the stream + * @enable: flag to determine if stream should start/stop + * + * When starting, check if there is no stream->kthread allocated. This should + * indicate that a stream is already running. Then, it initializes + * the pipeline, creates and runs a kthread to consume buffers through the + * pipeline. + * When stopping, analogously check if there is a stream running, stop + * the thread and terminates the pipeline. + */ int vimc_streamer_s_stream(struct vimc_stream *stream, struct vimc_ent_device *ved, int enable) |