[media] v4l: vb2: add prepare/finish callbacks to allocators

This patch adds support for prepare/finish callbacks in VB2 allocators. These
callback are used for buffer flushing.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index a51dad6bd394..613dea16a304 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -844,6 +844,7 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 {
         struct vb2_queue *q = vb->vb2_queue;
         unsigned long flags;
+        unsigned int plane;
 
         if (vb->state != VB2_BUF_STATE_ACTIVE)
                 return;
@@ -854,6 +855,10 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
         dprintk(4, "Done processing on buffer %d, state: %d\n",
                         vb->v4l2_buf.index, vb->state);
 
+        /* sync buffers */
+        for (plane = 0; plane < vb->num_planes; ++plane)
+                call_memop(q, finish, vb->planes[plane].mem_priv);
+
         /* Add the buffer to the done buffers list */
         spin_lock_irqsave(&q->done_lock, flags);
         vb->state = state;
@@ -1136,9 +1141,15 @@ err:
 static void __enqueue_in_driver(struct vb2_buffer *vb)
 {
         struct vb2_queue *q = vb->vb2_queue;
+        unsigned int plane;
 
         vb->state = VB2_BUF_STATE_ACTIVE;
         atomic_inc(&q->queued_count);
+
+        /* sync buffers */
+        for (plane = 0; plane < vb->num_planes; ++plane)
+                call_memop(q, prepare, vb->planes[plane].mem_priv);
+
         q->ops->buf_queue(vb);
 }