[PATCH v4 1/6] media: max9286: Add support for v4l2_subdev_state

[Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>]

Create and initialize the v4l2_subdev_state for the max9286 driver in
order to prepare to support routing operations and multiplexed streams.

Create the subdevice state with v4l2_subdev_init_finalize() and
implement the init_cfg() operation to guarantee the state is initialized
correctly with the default device format.

Remove the max9286_open() subdev internal operation as the format of the
file-handle state is now initialized by init_cfg().

Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
---
 drivers/media/i2c/max9286.c | 89 +++++++++++++++++++++++--------------
 1 file changed, 56 insertions(+), 33 deletions(-)

diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
index 9e204aabf465..1b9ff537d08e 100644
--- a/drivers/media/i2c/max9286.c
+++ b/drivers/media/i2c/max9286.c
@@ -214,6 +214,17 @@ static inline struct max9286_priv *sd_to_max9286(struct v4l2_subdev *sd)
 	return container_of(sd, struct max9286_priv, sd);
 }
 
+static const struct v4l2_mbus_framefmt max9286_default_format = {
+	.width		= 1280,
+	.height		= 800,
+	.code		= MEDIA_BUS_FMT_UYVY8_1X16,
+	.colorspace	= V4L2_COLORSPACE_SRGB,
+	.field		= V4L2_FIELD_NONE,
+	.ycbcr_enc	= V4L2_YCBCR_ENC_DEFAULT,
+	.quantization	= V4L2_QUANTIZATION_DEFAULT,
+	.xfer_func	= V4L2_XFER_FUNC_DEFAULT,
+};
+
 /* -----------------------------------------------------------------------------
  * I2C IO
  */
@@ -821,11 +832,45 @@ static int max9286_get_fmt(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int max9286_init_cfg(struct v4l2_subdev *sd,
+			    struct v4l2_subdev_state *state)
+{
+	struct v4l2_subdev_route routes[MAX9286_NUM_GMSL];
+	struct max9286_priv *priv = sd_to_max9286(sd);
+	struct v4l2_subdev_krouting routing;
+	struct max9286_source *source;
+	unsigned int num_routes = 0;
+	int ret;
+
+	/* Create a route for each enable source. */
+	for_each_source(priv, source) {
+		struct v4l2_subdev_route *route = &routes[num_routes++];
+		unsigned int idx = to_index(priv, source);
+
+		route->sink_pad = idx;
+		route->sink_stream = 0;
+		route->source_pad = MAX9286_SRC_PAD;
+		route->source_stream = idx;
+		route->flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE;
+	}
+
+	routing.num_routes = num_routes;
+	routing.routes = routes;
+
+	v4l2_subdev_lock_state(state);
+	ret = v4l2_subdev_set_routing_with_fmt(sd, state, &routing,
+					       &max9286_default_format);
+	v4l2_subdev_unlock_state(state);
+
+	return ret;
+}
+
 static const struct v4l2_subdev_video_ops max9286_video_ops = {
 	.s_stream	= max9286_s_stream,
 };
 
 static const struct v4l2_subdev_pad_ops max9286_pad_ops = {
+	.init_cfg	= max9286_init_cfg,
 	.enum_mbus_code = max9286_enum_mbus_code,
 	.get_fmt	= max9286_get_fmt,
 	.set_fmt	= max9286_set_fmt,
@@ -836,35 +881,6 @@ static const struct v4l2_subdev_ops max9286_subdev_ops = {
 	.pad		= &max9286_pad_ops,
 };
 
-static void max9286_init_format(struct v4l2_mbus_framefmt *fmt)
-{
-	fmt->width		= 1280;
-	fmt->height		= 800;
-	fmt->code		= MEDIA_BUS_FMT_UYVY8_1X16;
-	fmt->colorspace		= V4L2_COLORSPACE_SRGB;
-	fmt->field		= V4L2_FIELD_NONE;
-	fmt->ycbcr_enc		= V4L2_YCBCR_ENC_DEFAULT;
-	fmt->quantization	= V4L2_QUANTIZATION_DEFAULT;
-	fmt->xfer_func		= V4L2_XFER_FUNC_DEFAULT;
-}
-
-static int max9286_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
-{
-	struct v4l2_mbus_framefmt *format;
-	unsigned int i;
-
-	for (i = 0; i < MAX9286_N_SINKS; i++) {
-		format = v4l2_subdev_get_try_format(subdev, fh->state, i);
-		max9286_init_format(format);
-	}
-
-	return 0;
-}
-
-static const struct v4l2_subdev_internal_ops max9286_subdev_internal_ops = {
-	.open = max9286_open,
-};
-
 static int max9286_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	switch (ctrl->id) {
@@ -896,11 +912,11 @@ static int max9286_v4l2_register(struct max9286_priv *priv)
 	/* Configure V4L2 for the MAX9286 itself */
 
 	for (i = 0; i < MAX9286_N_SINKS; i++)
-		max9286_init_format(&priv->fmt[i]);
+		priv->fmt[i] = max9286_default_format;
 
 	v4l2_i2c_subdev_init(&priv->sd, priv->client, &max9286_subdev_ops);
-	priv->sd.internal_ops = &max9286_subdev_internal_ops;
-	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
+			  V4L2_SUBDEV_FL_MULTIPLEXED;
 
 	v4l2_ctrl_handler_init(&priv->ctrls, 1);
 	priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls,
@@ -932,14 +948,20 @@ static int max9286_v4l2_register(struct max9286_priv *priv)
 	}
 	priv->sd.fwnode = ep;
 
+	ret = v4l2_subdev_init_finalize(&priv->sd);
+	if (ret)
+		goto err_put_node;
+
 	ret = v4l2_async_register_subdev(&priv->sd);
 	if (ret < 0) {
 		dev_err(dev, "Unable to register subdevice\n");
-		goto err_put_node;
+		goto err_state_cleanup;
 	}
 
 	return 0;
 
+err_state_cleanup:
+	v4l2_subdev_cleanup(&priv->sd);
 err_put_node:
 	fwnode_handle_put(ep);
 err_async:
@@ -952,6 +974,7 @@ static void max9286_v4l2_unregister(struct max9286_priv *priv)
 {
 	fwnode_handle_put(priv->sd.fwnode);
 	v4l2_async_unregister_subdev(&priv->sd);
+	v4l2_subdev_cleanup(&priv->sd);
 	max9286_v4l2_notifier_unregister(priv);
 }
 
-- 
2.33.1