[PATCH 3/3] media: s5p-mfc: Fix to handle reference queue during finishing

[Smitha T Murthy]

On receiving last buffer driver puts MFC to MFCINST_FINISHING state which in
turn skips transferring of frame from SRC to REF queue. This causes driver to
stop MFC encoding and last frame is lost.

This patch guarantees safe handling of frames during MFCINST_FINISHING and
correct clearing of workbit to avoid early stopping of encoding.

Fixes: af93574678108 ("[media] MFC: Add MFC 5.1 V4L2 driver")

Cc: stable at vger.kernel.org
Cc: linux-fsd at tesla.com
Signed-off-by: Smitha T Murthy <smitha.t at samsung.com>
---
 drivers/media/platform/samsung/s5p-mfc/s5p_mfc_enc.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_enc.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_enc.c
index b65e506665af..e064bdd74f2e 100644
--- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_enc.c
+++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_enc.c
@@ -1218,6 +1218,7 @@ static int enc_post_frame_start(struct s5p_mfc_ctx *ctx)
 	unsigned long mb_y_addr, mb_c_addr;
 	int slice_type;
 	unsigned int strm_size;
+	bool src_ready;
 
 	slice_type = s5p_mfc_hw_call(dev->mfc_ops, get_enc_slice_type, dev);
 	strm_size = s5p_mfc_hw_call(dev->mfc_ops, get_enc_strm_size, dev);
@@ -1257,7 +1258,8 @@ static int enc_post_frame_start(struct s5p_mfc_ctx *ctx)
 			}
 		}
 	}
-	if ((ctx->src_queue_cnt > 0) && (ctx->state == MFCINST_RUNNING)) {
+	if ((ctx->src_queue_cnt > 0) && (ctx->state == MFCINST_RUNNING ||
+				ctx->state == MFCINST_FINISHING)) {
 		mb_entry = list_entry(ctx->src_queue.next, struct s5p_mfc_buf,
 									list);
 		if (mb_entry->flags & MFC_BUF_FLAG_USED) {
@@ -1288,7 +1290,13 @@ static int enc_post_frame_start(struct s5p_mfc_ctx *ctx)
 		vb2_set_plane_payload(&mb_entry->b->vb2_buf, 0, strm_size);
 		vb2_buffer_done(&mb_entry->b->vb2_buf, VB2_BUF_STATE_DONE);
 	}
-	if ((ctx->src_queue_cnt == 0) || (ctx->dst_queue_cnt == 0))
+
+	src_ready = true;
+	if ((ctx->state == MFCINST_RUNNING) && (ctx->src_queue_cnt == 0))
+		src_ready = false;
+	if ((ctx->state == MFCINST_FINISHING) && (ctx->ref_queue_cnt == 0))
+		src_ready = false;
+	if ((!src_ready) || (ctx->dst_queue_cnt == 0))
 		clear_work_bit(ctx);
 
 	return 0;
-- 
2.17.1