[PATCH 4/5] media: iris: Preserve timestamps on error buffers

[Xilin Wu <sophon@radxa.com>]

Clearing timestamps on error buffers prevents clients such as libva-v4l2
from identifying the failed picture and can cause synchronization timeouts.

Preserve the firmware-provided timestamp when returning an error buffer.

Fixes: b791dcfcba3a ("media: iris: Add handling for corrupt and drop frames")
Signed-off-by: Xilin Wu <sophon@radxa.com>
---
 drivers/media/platform/qcom/iris/iris_buffer.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/iris/iris_buffer.c b/drivers/media/platform/qcom/iris/iris_buffer.c
index eb8de60c1177..f790483d13d4 100644
--- a/drivers/media/platform/qcom/iris/iris_buffer.c
+++ b/drivers/media/platform/qcom/iris/iris_buffer.c
@@ -899,7 +899,8 @@ int iris_vb2_buffer_done(struct iris_inst *inst, struct iris_buffer *buf)
 	if (buf->flags & V4L2_BUF_FLAG_ERROR) {
 		state = VB2_BUF_STATE_ERROR;
 		vb2_set_plane_payload(vb2, 0, 0);
-		vb2->timestamp = 0;
+		/* Allow userspace to associate the error with the input frame. */
+		vb2->timestamp = buf->timestamp;
 		v4l2_m2m_buf_done(vbuf, state);
 		return 0;
 	}

-- 
2.56.0