diff options
Diffstat (limited to 'include/media/videobuf2-core.h')
| -rw-r--r-- | include/media/videobuf2-core.h | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 941055e9d125..bef53ce555d2 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -142,6 +142,7 @@ enum vb2_fileio_flags { /** * enum vb2_buffer_state - current video buffer state * @VB2_BUF_STATE_DEQUEUED: buffer under userspace control + * @VB2_BUF_STATE_PREPARING: buffer is being prepared in videobuf * @VB2_BUF_STATE_PREPARED: buffer prepared in videobuf and by the driver * @VB2_BUF_STATE_QUEUED: buffer queued in videobuf, but not in driver * @VB2_BUF_STATE_ACTIVE: buffer queued in driver and possibly used @@ -154,6 +155,7 @@ enum vb2_fileio_flags { */ enum vb2_buffer_state { VB2_BUF_STATE_DEQUEUED, + VB2_BUF_STATE_PREPARING, VB2_BUF_STATE_PREPARED, VB2_BUF_STATE_QUEUED, VB2_BUF_STATE_ACTIVE, @@ -250,10 +252,13 @@ struct vb2_buffer { * receive buffers with @buf_queue callback before * @start_streaming is called; the driver gets the number * of already queued buffers in count parameter; driver - * can return an error if hardware fails or not enough - * buffers has been queued, in such case all buffers that - * have been already given by the @buf_queue callback are - * invalidated. + * can return an error if hardware fails, in that case all + * buffers that have been already given by the @buf_queue + * callback are invalidated. + * If there were not enough queued buffers to start + * streaming, then this callback returns -ENOBUFS, and the + * vb2 core will retry calling @start_streaming when a new + * buffer is queued. * @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() @@ -321,6 +326,9 @@ struct v4l2_fh; * @done_wq: waitqueue for processes waiting for buffers ready to be dequeued * @alloc_ctx: memory type/allocator-specific contexts for each plane * @streaming: current streaming state + * @retry_start_streaming: start_streaming() was called, but there were not enough + * buffers queued. If set, then retry calling start_streaming when + * queuing a new buffer. * @fileio: file io emulator internal data, used only if emulator is active */ struct vb2_queue { @@ -353,6 +361,7 @@ struct vb2_queue { unsigned int plane_sizes[VIDEO_MAX_PLANES]; unsigned int streaming:1; + unsigned int retry_start_streaming:1; struct vb2_fileio_data *fileio; }; @@ -491,6 +500,7 @@ int vb2_ioctl_expbuf(struct file *file, void *priv, int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma); int vb2_fop_release(struct file *file); +int _vb2_fop_release(struct file *file, struct mutex *lock); ssize_t vb2_fop_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos); ssize_t vb2_fop_read(struct file *file, char __user *buf, |