[26/32] media: rcar-vin: add helpers for bridge

Commit Message

Niklas Söderlund Nov. 2, 2016, 1:23 p.m. UTC

On Gen3 there might be a CSI2 bridge between the video source and the
VIN. Add helpers to check for this and to fetch the bridge subdevice.

Signed-off-by: Niklas Söderlund <[e-mail]>
---
 drivers/media/platform/rcar-vin/rcar-core.c | 19 +++++++++++++++++++
 drivers/media/platform/rcar-vin/rcar-vin.h  |  2 ++
 2 files changed, 21 insertions(+)

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index f382f91..a409157 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -369,6 +369,11 @@  static int rvin_group_vin_to_csi(struct rvin_dev *vin)
 	return csi;
 }
 
+bool vin_have_bridge(struct rvin_dev *vin)
+{
+	return vin->digital.subdev == NULL;
+}
+
 struct rvin_graph_entity *vin_to_entity(struct rvin_dev *vin)
 {
 	int csi;
@@ -399,6 +404,20 @@  struct v4l2_subdev *vin_to_source(struct rvin_dev *vin)
 	return vin->group->source[csi].subdev;
 }
 
+struct v4l2_subdev *vin_to_bridge(struct rvin_dev *vin)
+{
+	int csi;
+
+	if (vin->digital.subdev)
+		return NULL;
+
+	csi = rvin_group_vin_to_csi(vin);
+	if (csi < 0)
+		return NULL;
+
+	return vin->group->bridge[csi].subdev;
+}
+
 /* -----------------------------------------------------------------------------
  * Async notifier helpers
  */
diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 2f1e087..acaed2b 100644
--- a/drivers/media/platform/rcar-vin/rcar-vin.h
+++ b/drivers/media/platform/rcar-vin/rcar-vin.h
@@ -206,8 +206,10 @@  struct rvin_dev {
 	struct v4l2_rect compose;
 };
 
+bool vin_have_bridge(struct rvin_dev *vin);
 struct rvin_graph_entity *vin_to_entity(struct rvin_dev *vin);
 struct v4l2_subdev *vin_to_source(struct rvin_dev *vin);
+struct v4l2_subdev *vin_to_bridge(struct rvin_dev *vin);
 
 /* Debug */
 #define vin_dbg(d, fmt, arg...)		dev_dbg(d->dev, fmt, ##arg)