[PATCH v4 32/36] media: imx: csi/fim: add support for frame intervals

[Steve Longerbeam]

Add support to CSI for negotiation of frame intervals, and use this
information to configure the frame interval monitor.

Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxx>
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
 drivers/staging/media/imx/imx-media-csi.c | 36 ++++++++++++++++++++++++++++---
 drivers/staging/media/imx/imx-media-fim.c | 28 +++++++++---------------
 drivers/staging/media/imx/imx-media.h     |  2 +-
 3 files changed, 44 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index b0aac82..040cca6 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -56,6 +56,7 @@ struct csi_priv {
 
 	struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
 	const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
+	struct v4l2_fract frame_interval;
 	struct v4l2_rect crop;
 
 	/* the video device at IDMAC output pad */
@@ -565,7 +566,8 @@ static int csi_start(struct csi_priv *priv)
 
 	/* start the frame interval monitor */
 	if (priv->fim) {
-		ret = imx_media_fim_set_stream(priv->fim, priv->sensor, true);
+		ret = imx_media_fim_set_stream(priv->fim,
+					       &priv->frame_interval, true);
 		if (ret)
 			goto idmac_stop;
 	}
@@ -580,7 +582,8 @@ static int csi_start(struct csi_priv *priv)
 
 fim_off:
 	if (priv->fim)
-		imx_media_fim_set_stream(priv->fim, priv->sensor, false);
+		imx_media_fim_set_stream(priv->fim,
+					 &priv->frame_interval, false);
 idmac_stop:
 	if (priv->dest == IPU_CSI_DEST_IDMAC)
 		csi_idmac_stop(priv);
@@ -594,11 +597,36 @@ static void csi_stop(struct csi_priv *priv)
 
 	/* stop the frame interval monitor */
 	if (priv->fim)
-		imx_media_fim_set_stream(priv->fim, priv->sensor, false);
+		imx_media_fim_set_stream(priv->fim,
+					 &priv->frame_interval, false);
 
 	ipu_csi_disable(priv->csi);
 }
 
+static int csi_g_frame_interval(struct v4l2_subdev *sd,
+				struct v4l2_subdev_frame_interval *fi)
+{
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+
+	fi->interval = priv->frame_interval;
+
+	return 0;
+}
+
+static int csi_s_frame_interval(struct v4l2_subdev *sd,
+				struct v4l2_subdev_frame_interval *fi)
+{
+	struct csi_priv *priv = v4l2_get_subdevdata(sd);
+
+	/* Output pads mirror active input pad, no limits on input pads */
+	if (fi->pad == CSI_SRC_PAD_IDMAC || fi->pad == CSI_SRC_PAD_DIRECT)
+		fi->interval = priv->frame_interval;
+
+	priv->frame_interval = fi->interval;
+
+	return 0;
+}
+
 static int csi_s_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct csi_priv *priv = v4l2_get_subdevdata(sd);
@@ -1187,6 +1215,8 @@ static struct v4l2_subdev_core_ops csi_core_ops = {
 };
 
 static struct v4l2_subdev_video_ops csi_video_ops = {
+	.g_frame_interval = csi_g_frame_interval,
+	.s_frame_interval = csi_s_frame_interval,
 	.s_stream = csi_s_stream,
 };
 
diff --git a/drivers/staging/media/imx/imx-media-fim.c b/drivers/staging/media/imx/imx-media-fim.c
index acc7e39..a6ed57e 100644
--- a/drivers/staging/media/imx/imx-media-fim.c
+++ b/drivers/staging/media/imx/imx-media-fim.c
@@ -67,26 +67,18 @@ struct imx_media_fim {
 };
 
 static void update_fim_nominal(struct imx_media_fim *fim,
-			       struct imx_media_subdev *sensor)
+			       const struct v4l2_fract *fi)
 {
-	struct v4l2_streamparm parm;
-	struct v4l2_fract tpf;
-	int ret;
-
-	parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-	ret = v4l2_subdev_call(sensor->sd, video, g_parm, &parm);
-	tpf = parm.parm.capture.timeperframe;
-
-	if (ret || tpf.denominator == 0) {
-		dev_dbg(fim->sd->dev, "no tpf from sensor, FIM disabled\n");
+	if (fi->denominator == 0) {
+		dev_dbg(fim->sd->dev, "no frame interval, FIM disabled\n");
 		fim->enabled = false;
 		return;
 	}
 
-	fim->nominal = DIV_ROUND_CLOSEST(1000 * 1000 * tpf.numerator,
-					 tpf.denominator);
+	fim->nominal = DIV_ROUND_CLOSEST_ULL(1000000ULL * (u64)fi->numerator,
+					     fi->denominator);
 
-	dev_dbg(fim->sd->dev, "sensor FI=%lu usec\n", fim->nominal);
+	dev_dbg(fim->sd->dev, "FI=%lu usec\n", fim->nominal);
 }
 
 static void reset_fim(struct imx_media_fim *fim, bool curval)
@@ -130,8 +122,8 @@ static void send_fim_event(struct imx_media_fim *fim, unsigned long error)
 
 /*
  * Monitor an averaged frame interval. If the average deviates too much
- * from the sensor's nominal frame rate, send the frame interval error
- * event. The frame intervals are averaged in order to quiet noise from
+ * from the nominal frame rate, send the frame interval error event. The
+ * frame intervals are averaged in order to quiet noise from
  * (presumably random) interrupt latency.
  */
 static void frame_interval_monitor(struct imx_media_fim *fim,
@@ -422,12 +414,12 @@ EXPORT_SYMBOL_GPL(imx_media_fim_set_power);
 
 /* Called by the subdev in its s_stream callback */
 int imx_media_fim_set_stream(struct imx_media_fim *fim,
-			     struct imx_media_subdev *sensor,
+			     const struct v4l2_fract *fi,
 			     bool on)
 {
 	if (on) {
 		reset_fim(fim, true);
-		update_fim_nominal(fim, sensor);
+		update_fim_nominal(fim, fi);
 
 		if (fim->icap_channel >= 0)
 			fim_acquire_first_ts(fim);
diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
index ae3af0d..7f19739 100644
--- a/drivers/staging/media/imx/imx-media.h
+++ b/drivers/staging/media/imx/imx-media.h
@@ -259,7 +259,7 @@ struct imx_media_fim;
 void imx_media_fim_eof_monitor(struct imx_media_fim *fim, struct timespec *ts);
 int imx_media_fim_set_power(struct imx_media_fim *fim, bool on);
 int imx_media_fim_set_stream(struct imx_media_fim *fim,
-			     struct imx_media_subdev *sensor,
+			     const struct v4l2_fract *frame_interval,
 			     bool on);
 struct imx_media_fim *imx_media_fim_init(struct v4l2_subdev *sd);
 void imx_media_fim_free(struct imx_media_fim *fim);
-- 
2.7.4