[PATCH v4 02/24] media: v4l2-mem2mem: Trace on implicit un-hold

[Nicolas Dufresne]

If the timestamp of the src buffer differs from the timestamp of a held
dst buffer, the held buffer is implicitly removed and marked as done.
Add a trace to help debugging if someone hits that case.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>
Reviewed-by: Sebastian Fricke <sebastian.fricke@xxxxxxxxxxxxx>
Reviewed-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
---
 drivers/media/v4l2-core/v4l2-mem2mem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 675e22895ebe..d1d29d6ab024 100644
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -336,6 +336,7 @@ static void __v4l2_m2m_try_queue(struct v4l2_m2m_dev *m2m_dev,
 	if (src && dst && dst->is_held &&
 	    dst->vb2_buf.copied_timestamp &&
 	    dst->vb2_buf.timestamp != src->vb2_buf.timestamp) {
+		dprintk("Timestamp mismatch, returning held capture buffer\n");
 		dst->is_held = false;
 		v4l2_m2m_dst_buf_remove(m2m_ctx);
 		v4l2_m2m_buf_done(dst, VB2_BUF_STATE_DONE);
-- 
2.34.1