[PATCH v1 6/7] media: chips-media: wave5: Fix pipeline stall when queuing fails

["Jackson.lee" <jackson.lee@chipsnmedia.com>]

From: Jackson Lee <jackson.lee@chipsnmedia.com>

The Wave5 decoder calls v4l2_m2m_job_finish() immediately in device_run()
after submitting frames to firmware. When the firmware completes those
frames and the queue drains to zero, finish_decode() has no active M2M
job to finish, so v4l2_m2m_schedule_next_job() is never called and the
decoder stalls.

Call v4l2_m2m_try_schedule() in finish_decode() when the firmware queue
empties to ensure the framework always schedules the next device_run().

Fixes: a176ac5e701f ("media: chips-media: wave5: Improve performance of decoder")
Cc: stable@vger.kernel.org
Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
---
 drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
index f33c00cb801b..1817b83c5884 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
@@ -475,7 +475,10 @@ static void wave5_vpu_dec_finish_decode(struct vpu_instance *inst)
 			v4l2_m2m_job_finish(inst->v4l2_m2m_dev, m2m_ctx);
 	}
 
-	inst->queuing_fail = false;
+	if (inst->queuing_fail) {
+		inst->queuing_fail = false;
+		v4l2_m2m_try_schedule(m2m_ctx);
+	}
 }
 
 static int wave5_vpu_dec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
-- 
2.43.0