diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
commit | e5fd91f1ef340da553f7a79da9540c3db711c937 (patch) | |
tree | b11842027dc6641da63f4bcc524f8678263304a3 /drivers/media/v4l2-core/videobuf2-core.c | |
parent | 2a9b0348e685a63d97486f6749622b61e9e3292f (diff) |
Linux-libre 4.2-gnu
Diffstat (limited to 'drivers/media/v4l2-core/videobuf2-core.c')
-rw-r--r-- | drivers/media/v4l2-core/videobuf2-core.c | 68 |
1 files changed, 50 insertions, 18 deletions
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index cf9d644a8..a14c428f7 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -182,6 +182,7 @@ module_param(debug, int, 0644); V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE) static void __vb2_queue_cancel(struct vb2_queue *q); +static void __enqueue_in_driver(struct vb2_buffer *vb); /** * __vb2_buf_mem_alloc() - allocate video memory for the given buffer @@ -714,6 +715,7 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) break; case VB2_BUF_STATE_PREPARING: case VB2_BUF_STATE_DEQUEUED: + case VB2_BUF_STATE_REQUEUEING: /* nothing */ break; } @@ -1153,8 +1155,9 @@ EXPORT_SYMBOL_GPL(vb2_plane_cookie); /** * vb2_buffer_done() - inform videobuf that an operation on a buffer is finished * @vb: vb2_buffer returned from the driver - * @state: either VB2_BUF_STATE_DONE if the operation finished successfully - * or VB2_BUF_STATE_ERROR if the operation finished with an error. + * @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. * If start_streaming fails then it should return buffers with state * VB2_BUF_STATE_QUEUED to put them back into the queue. * @@ -1180,7 +1183,8 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) if (WARN_ON(state != VB2_BUF_STATE_DONE && state != VB2_BUF_STATE_ERROR && - state != VB2_BUF_STATE_QUEUED)) + state != VB2_BUF_STATE_QUEUED && + state != VB2_BUF_STATE_REQUEUEING)) state = VB2_BUF_STATE_ERROR; #ifdef CONFIG_VIDEO_ADV_DEBUG @@ -1197,19 +1201,30 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state) for (plane = 0; plane < vb->num_planes; ++plane) call_void_memop(vb, finish, vb->planes[plane].mem_priv); - /* Add the buffer to the done buffers list */ spin_lock_irqsave(&q->done_lock, flags); - vb->state = state; - if (state != VB2_BUF_STATE_QUEUED) + if (state == VB2_BUF_STATE_QUEUED || + state == VB2_BUF_STATE_REQUEUEING) { + vb->state = VB2_BUF_STATE_QUEUED; + } else { + /* Add the buffer to the done buffers list */ list_add_tail(&vb->done_entry, &q->done_list); + vb->state = state; + } atomic_dec(&q->owned_by_drv_count); spin_unlock_irqrestore(&q->done_lock, flags); - if (state == VB2_BUF_STATE_QUEUED) + switch (state) { + case VB2_BUF_STATE_QUEUED: return; - - /* Inform any processes that may be waiting for buffers */ - wake_up(&q->done_wq); + case VB2_BUF_STATE_REQUEUEING: + if (q->start_streaming_called) + __enqueue_in_driver(vb); + return; + default: + /* Inform any processes that may be waiting for buffers */ + wake_up(&q->done_wq); + break; + } } EXPORT_SYMBOL_GPL(vb2_buffer_done); @@ -1239,19 +1254,19 @@ EXPORT_SYMBOL_GPL(vb2_discard_done); static void vb2_warn_zero_bytesused(struct vb2_buffer *vb) { - static bool __check_once __read_mostly; + static bool check_once; - if (__check_once) + if (check_once) return; - __check_once = true; - __WARN(); + check_once = true; + WARN_ON(1); - pr_warn_once("use of bytesused == 0 is deprecated and will be removed in the future,\n"); + pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n"); if (vb->vb2_queue->allow_zero_bytesused) - pr_warn_once("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); + pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n"); else - pr_warn_once("use the actual size instead.\n"); + pr_warn("use the actual size instead.\n"); } /** @@ -1958,6 +1973,11 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking) return -EIO; } + if (q->last_buffer_dequeued) { + dprintk(3, "last buffer dequeued already, will not wait for buffers\n"); + return -EPIPE; + } + if (!list_empty(&q->done_list)) { /* * Found a buffer that we were waiting for. @@ -2113,6 +2133,9 @@ static int vb2_internal_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool n /* Remove from videobuf queue */ list_del(&vb->queued_entry); q->queued_count--; + if (!V4L2_TYPE_IS_OUTPUT(q->type) && + vb->v4l2_buf.flags & V4L2_BUF_FLAG_LAST) + q->last_buffer_dequeued = true; /* go back to dequeued state */ __vb2_dqbuf(vb); @@ -2326,6 +2349,7 @@ static int vb2_internal_streamoff(struct vb2_queue *q, enum v4l2_buf_type type) */ __vb2_queue_cancel(q); q->waiting_for_buffers = !V4L2_TYPE_IS_OUTPUT(q->type); + q->last_buffer_dequeued = false; dprintk(3, "successful\n"); return 0; @@ -2668,8 +2692,16 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) return res | POLLOUT | POLLWRNORM; - if (list_empty(&q->done_list)) + if (list_empty(&q->done_list)) { + /* + * If the last buffer was dequeued from a capture queue, + * return immediately. DQBUF will return -EPIPE. + */ + if (q->last_buffer_dequeued) + return res | POLLIN | POLLRDNORM; + poll_wait(file, &q->done_wq, wait); + } /* * Take first buffer available for dequeuing. |