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authorLuca Ceresoli <luca@lucaceresoli.net>2018-03-08 07:26:21 -0500
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2018-03-21 12:01:01 -0400
commit68a06bd04e20f46a8f9c5d8c89ea4311bfefa939 (patch)
treea6dcc3de1ef2c95476e2f8b9b9d3e987b128b8dd /include/media/videobuf2-core.h
parent45ad39999b00afde5f9d6b074da4bcaf4644c6d7 (diff)
media: vb2-core: document the REQUEUEING state
VB2_BUF_STATE_REQUEUEING is accepted by vb2_buffer_done() but not documented, so add it along with notes about calls in interrupt context. Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net> Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Pawel Osciak <pawel@osciak.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
-rw-r--r--include/media/videobuf2-core.h24
1 files changed, 15 insertions, 9 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index f1a479060f9e..f20000887d3c 100644
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -358,12 +358,12 @@ struct vb2_buffer {
* driver can return an error if hardware fails, in that
* case all buffers that have been already given by
* the @buf_queue callback are to be returned by the driver
- * by calling vb2_buffer_done() with %VB2_BUF_STATE_QUEUED.
- * If you need a minimum number of buffers before you can
- * start streaming, then set
- * &vb2_queue->min_buffers_needed. If that is non-zero then
- * @start_streaming won't be called until at least that
- * many buffers have been queued up by userspace.
+ * by calling vb2_buffer_done() with %VB2_BUF_STATE_QUEUED
+ * or %VB2_BUF_STATE_REQUEUEING. If you need a minimum
+ * number of buffers before you can start streaming, then
+ * set &vb2_queue->min_buffers_needed. If that is non-zero
+ * then @start_streaming won't be called until at least
+ * that many buffers have been queued up by userspace.
* @stop_streaming: called when 'streaming' state must be disabled; driver
* should stop any DMA transactions or wait until they
* finish and give back all buffers it got from &buf_queue
@@ -601,8 +601,9 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
* @state: state of the buffer, as defined by &enum vb2_buffer_state.
* Either %VB2_BUF_STATE_DONE if the operation finished
* successfully, %VB2_BUF_STATE_ERROR if the operation finished
- * with an error or %VB2_BUF_STATE_QUEUED if the driver wants to
- * requeue buffers.
+ * with an error or any of %VB2_BUF_STATE_QUEUED or
+ * %VB2_BUF_STATE_REQUEUEING if the driver wants to
+ * requeue buffers (see below).
*
* This function should be called by the driver after a hardware operation on
* a buffer is finished and the buffer may be returned to userspace. The driver
@@ -613,7 +614,12 @@ void *vb2_plane_cookie(struct vb2_buffer *vb, unsigned int plane_no);
* While streaming a buffer can only be returned in state DONE or ERROR.
* The &vb2_ops->start_streaming op can also return them in case the DMA engine
* cannot be started for some reason. In that case the buffers should be
- * returned with state QUEUED to put them back into the queue.
+ * returned with state QUEUED or REQUEUEING to put them back into the queue.
+ *
+ * %VB2_BUF_STATE_REQUEUEING is like %VB2_BUF_STATE_QUEUED, but it also calls
+ * &vb2_ops->buf_queue to queue buffers back to the driver. Note that calling
+ * vb2_buffer_done(..., VB2_BUF_STATE_REQUEUEING) from interrupt context will
+ * result in &vb2_ops->buf_queue being called in interrupt context as well.
*/
void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state);