[PATCH v4 2/2] media: staging/imx: fill vb2_v4l2_buffer sequence entry

[Peter Seiderer <ps.report@gmx.net>]

- enables gstreamer v4l2src lost frame detection, e.g:

  0:00:08.685185668  348  0x54f520 WARN  v4l2src gstv4l2src.c:970:gst_v4l2src_create:<v4l2src0> lost frames detected: count = 141 - ts: 0:00:08.330177332

- fixes v4l2-compliance test failure:

  Streaming ioctls:
          test read/write: OK (Not Supported)
              Video Capture:
                  Buffer: 0 Sequence: 0 Field: None Timestamp: 92.991450s
                  Buffer: 1 Sequence: 0 Field: None Timestamp: 93.008135s
                  fail: v4l2-test-buffers.cpp(294): (int)g_sequence() < seq.last_seq + 1
                  fail: v4l2-test-buffers.cpp(707): buf.check(q, last_seq)

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
---
Changes in v2:
  - fill vb2_v4l2_buffer sequence entry in imx-ic-prpencvf too
    (suggested by Steve Longerbeam)

Changes in v3:
  - add changelog (suggested by Greg Kroah-Hartman, Fabio Estevam
    and Dan Carpenter) and patch history
  - use u32 (instead of __u32) (suggested by Dan Carpenter)
  - let sequence counter start with zero, keeping v4l2-compliance
    testing happy (needs additional setting of field to a valid
    value, patch will follow soon)

Changes in v4:
  - add v4l2-compliance test failure to changelog
  - reorder frame_sequence increment and assignement to
    avoid -1 as start value (suggeted by Steve Longerbeam)
---
 drivers/staging/media/imx/imx-ic-prpencvf.c | 4 ++++
 drivers/staging/media/imx/imx-media-csi.c   | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index ffeb017c73b2..28f41caba05d 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -103,6 +103,7 @@ struct prp_priv {
 	int nfb4eof_irq;
 
 	int stream_count;
+	u32 frame_sequence; /* frame sequence counter */
 	bool last_eof;  /* waiting for last EOF at stream off */
 	bool nfb4eof;    /* NFB4EOF encountered during streaming */
 	struct completion last_eof_comp;
@@ -211,12 +212,14 @@ static void prp_vb2_buf_done(struct prp_priv *priv, struct ipuv3_channel *ch)
 	done = priv->active_vb2_buf[priv->ipu_buf_num];
 	if (done) {
 		done->vbuf.field = vdev->fmt.fmt.pix.field;
+		done->vbuf.sequence = priv->frame_sequence;
 		vb = &done->vbuf.vb2_buf;
 		vb->timestamp = ktime_get_ns();
 		vb2_buffer_done(vb, priv->nfb4eof ?
 				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 	}
 
+	priv->frame_sequence++;
 	priv->nfb4eof = false;
 
 	/* get next queued buffer */
@@ -638,6 +641,7 @@ static int prp_start(struct prp_priv *priv)
 
 	/* init EOF completion waitq */
 	init_completion(&priv->last_eof_comp);
+	priv->frame_sequence = 0;
 	priv->last_eof = false;
 	priv->nfb4eof = false;
 
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index 5f69117b5811..3f2ce05848f3 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -111,6 +111,7 @@ struct csi_priv {
 	struct v4l2_ctrl_handler ctrl_hdlr;
 
 	int stream_count; /* streaming counter */
+	u32 frame_sequence; /* frame sequence counter */
 	bool last_eof;   /* waiting for last EOF at stream off */
 	bool nfb4eof;    /* NFB4EOF encountered during streaming */
 	struct completion last_eof_comp;
@@ -237,12 +238,14 @@ static void csi_vb2_buf_done(struct csi_priv *priv)
 	done = priv->active_vb2_buf[priv->ipu_buf_num];
 	if (done) {
 		done->vbuf.field = vdev->fmt.fmt.pix.field;
+		done->vbuf.sequence = priv->frame_sequence;
 		vb = &done->vbuf.vb2_buf;
 		vb->timestamp = ktime_get_ns();
 		vb2_buffer_done(vb, priv->nfb4eof ?
 				VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 	}
 
+	priv->frame_sequence++;
 	priv->nfb4eof = false;
 
 	/* get next queued buffer */
@@ -544,6 +547,7 @@ static int csi_idmac_start(struct csi_priv *priv)
 
 	/* init EOF completion waitq */
 	init_completion(&priv->last_eof_comp);
+	priv->frame_sequence = 0;
 	priv->last_eof = false;
 	priv->nfb4eof = false;
 
-- 
2.16.2

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