[PATCH v4 2/7] media: tvp5150: add input source selection of_graph support

[Marco Felsch <m.felsch@pengutronix.de>]

This patch adds the of_graph support to describe the tvp connections.
Physical the TVP5150 has three ports: AIP1A, AIP1B and YOUT. As result
of discussion [1],[2] the device-tree maps these ports 1:1. The svideo
connector must be conneted to port@0/endpoint@1, look at the Documentation
for more information. Since the TVP5150 is a converter the device-tree
must contain at least 1-input and 1-output port. The mc-connectors and
mc-links are only created if the device-tree contains the corresponding
connector nodes. If more than one connector is available the
media_entity_operations.link_setup() callback ensures that only one
connector is active.

[1] https://www.spinics.net/lists/linux-media/msg138545.html
[2] https://www.spinics.net/lists/linux-media/msg138546.html

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
Changelog:

v4:
- rebase on top of media_tree/master, fix merge conflict due to commit
  60359a28d592 ("media: v4l: fwnode: Initialise the V4L2 fwnode endpoints
  to zero")

v3:
- probe(): s/err/err_free_v4l2_ctrls
- drop MC dependency for tvp5150_pads

v2:
- adapt commit message
- unify ifdef switches
- rename tvp5150_valid_input -> tvp5150_of_valid_input, to be more precise
- mc: use 2-input and 1-output pad
- mc: link svideo connector to both input pads
- mc: enable/disable svideo links in one go
- mc: change link_setup() behaviour, switch the input src don't require a
      explicite disable before.
- mc: rename 'local' media_pad param to tvp5150_pad to avoid confusion
- mc: enable link to the first available connector and set the
      corresponding tvp5150 input src per default during registered()
- mc/of: factor out oftree connector allocation
- of: drop svideo dt port
- of: move svideo connector to port@0/endpoint@1
- of: require at least 1-in and 1-out endpoint

 drivers/media/i2c/tvp5150.c | 481 +++++++++++++++++++++++++++++++++---
 1 file changed, 442 insertions(+), 39 deletions(-)

diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
index 89da921c8886..a89b83f69266 100644
--- a/drivers/media/i2c/tvp5150.c
+++ b/drivers/media/i2c/tvp5150.c
@@ -44,15 +44,38 @@ MODULE_PARM_DESC(debug, "Debug level (0-2)");
 #define dprintk0(__dev, __arg...) dev_dbg_lvl(__dev, 0, 0, __arg)
 
 enum tvp5150_pads {
-	TVP5150_PAD_IF_INPUT,
+	TVP5150_PAD_AIP1A = TVP5150_COMPOSITE0,
+	TVP5150_PAD_AIP1B,
 	TVP5150_PAD_VID_OUT,
 	TVP5150_NUM_PADS
 };
 
+#if defined(CONFIG_MEDIA_CONTROLLER)
+enum tvp5150_pads_state {
+	TVP5150_PAD_INACTIVE,
+	TVP5150_PAD_ACTIVE_COMPOSITE,
+	TVP5150_PAD_ACTIVE_SVIDEO,
+};
+
+struct tvp5150_connector {
+	struct media_entity ent;
+	struct media_pad pad;
+	unsigned int port_num;
+	bool is_svideo;
+};
+#endif
+
 struct tvp5150 {
 	struct v4l2_subdev sd;
-#ifdef CONFIG_MEDIA_CONTROLLER
+	/* additional additional endpoint for the svideo connector */
+	struct device_node *endpoints[TVP5150_NUM_PADS + 1];
+	unsigned int endpoints_num;
+#if defined(CONFIG_MEDIA_CONTROLLER)
 	struct media_pad pads[TVP5150_NUM_PADS];
+	int pads_state[TVP5150_NUM_PADS];
+	struct tvp5150_connector *connectors;
+	int connectors_num;
+	bool modify_second_link;
 #endif
 	struct v4l2_ctrl_handler hdl;
 	struct v4l2_rect rect;
@@ -1167,6 +1190,160 @@ static int tvp5150_enum_frame_size(struct v4l2_subdev *sd,
 	return 0;
 }
 
+/****************************************************************************
+ *			Media entity ops
+ ****************************************************************************/
+#if defined(CONFIG_MEDIA_CONTROLLER)
+static int tvp5150_active_pad_idx(struct tvp5150 *decoder)
+{
+	int *pad_state = &decoder->pads_state[0];
+	int i, idx = -1;
+
+	for (i = 0; i < TVP5150_NUM_PADS - 1; i++) {
+		if ((pad_state[i] == TVP5150_PAD_ACTIVE_COMPOSITE) ||
+		    (pad_state[i] == TVP5150_PAD_ACTIVE_SVIDEO)) {
+			idx = i;
+			break;
+		}
+	}
+
+	return idx;
+}
+
+static int tvp5150_active_svideo_links(struct tvp5150 *decoder)
+{
+	int *pad_state = &decoder->pads_state[0];
+	int i, links = 0;
+
+	for (i = 0; i < TVP5150_NUM_PADS - 1; i++)
+		if (pad_state[i] == TVP5150_PAD_ACTIVE_SVIDEO)
+			links++;
+
+	return links;
+}
+
+static int tvp5150_modify_link(struct tvp5150 *decoder, unsigned int pad_idx,
+			       struct media_pad *pad, int flags)
+{
+	struct media_pad *src_pad;
+	struct media_link *link;
+
+	if (pad)
+		src_pad = pad;
+	else
+		src_pad = media_entity_remote_pad(&decoder->pads[pad_idx]);
+
+	if (!src_pad)
+		return -1;
+
+	link = media_entity_find_link(src_pad,
+				      &decoder->pads[pad_idx]);
+
+	/*
+	 * Don't use locked version, since we are running already within the
+	 * media_entity_setup_link() context.
+	 */
+	return __media_entity_setup_link(link, flags);
+
+}
+
+static int tvp5150_s_routing(struct v4l2_subdev *sd, u32 input, u32 output,
+			     u32 config);
+
+static int tvp5150_link_setup(struct media_entity *entity,
+			      const struct media_pad *tvp5150_pad,
+			      const struct media_pad *remote, u32 flags)
+{
+	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct tvp5150 *decoder = to_tvp5150(sd);
+	int *pad_state = &decoder->pads_state[0];
+	int i, active_pad, ret = 0;
+	bool is_svideo = false;
+
+	/*
+	 * The tvp state is determined by the enabled sink pad link.
+	 * Enabling or disabling the source pad link has no effect.
+	 */
+	if (tvp5150_pad->flags & MEDIA_PAD_FL_SOURCE)
+		return 0;
+
+	/* check if the svideo connector should be enabled */
+	for (i = 0; i < decoder->connectors_num; i++) {
+		if (remote->entity == &decoder->connectors[i].ent) {
+			is_svideo = decoder->connectors[i].is_svideo;
+			break;
+		}
+	}
+
+	/* check if there is already a enabled svideo link and determine pad */
+	active_pad = tvp5150_active_pad_idx(decoder);
+
+	dev_dbg(sd->dev, "link setup '%s':%d->'%s':%d[%d]",
+		remote->entity->name, remote->index, tvp5150_pad->entity->name,
+		tvp5150_pad->index, flags & MEDIA_LNK_FL_ENABLED);
+
+	if (flags & MEDIA_LNK_FL_ENABLED) {
+		if (active_pad >= 0 && !decoder->modify_second_link)
+			tvp5150_modify_link(decoder, active_pad, NULL, 0);
+
+		dev_dbg(sd->dev, "Setting %d active [%s]\n", tvp5150_pad->index,
+			is_svideo ? "svideo" : "composite");
+		pad_state[tvp5150_pad->index] =
+			is_svideo ? TVP5150_PAD_ACTIVE_SVIDEO :
+				    TVP5150_PAD_ACTIVE_COMPOSITE;
+
+		if (is_svideo) {
+			if (tvp5150_active_svideo_links(decoder) < 2) {
+				unsigned int idx = tvp5150_pad->index ^ 1;
+
+				decoder->modify_second_link = true;
+				tvp5150_modify_link(decoder, idx,
+						    (struct media_pad *)remote,
+						    MEDIA_LNK_FL_ENABLED);
+			} else {
+				decoder->modify_second_link = false;
+				tvp5150_s_routing(sd, TVP5150_SVIDEO,
+						  TVP5150_NORMAL, 0);
+			}
+		} else {
+			tvp5150_s_routing(sd, tvp5150_pad->index,
+					  TVP5150_NORMAL, 0);
+		}
+	} else {
+		/*
+		 * Svideo streams on two pads and user can request to AIP1A or
+		 * AIP1B pad. In either case both pads gets disabled in in go.
+		 * So check only if user wants to disable a not enabled
+		 * composite pad.
+		 */
+		if (!is_svideo && tvp5150_pad->index != active_pad)
+			goto out;
+
+		dev_dbg(sd->dev, "going inactive\n");
+		pad_state[tvp5150_pad->index] = TVP5150_PAD_INACTIVE;
+
+		/* in case of svideo we need to disable the second pad too */
+		if (tvp5150_active_svideo_links(decoder) > 0) {
+			unsigned int idx = tvp5150_pad->index ^ 1;
+
+			decoder->modify_second_link = true;
+			tvp5150_modify_link(decoder, idx,
+					    (struct media_pad *)remote, 0);
+		}
+
+		if (!decoder->modify_second_link)
+			tvp5150_s_routing(sd, is_svideo ? TVP5150_SVIDEO :
+					  active_pad, TVP5150_BLACK_SCREEN, 0);
+		decoder->modify_second_link = false;
+	}
+out:
+	return ret;
+}
+
+static const struct media_entity_operations tvp5150_sd_media_ops = {
+	.link_setup = tvp5150_link_setup,
+};
+#endif
 /****************************************************************************
 			I2C Command
  ****************************************************************************/
@@ -1314,6 +1491,76 @@ static int tvp5150_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
 	return 0;
 }
 
+static int tvp5150_registered(struct v4l2_subdev *sd)
+{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	struct tvp5150 *decoder = to_tvp5150(sd);
+	unsigned int i;
+	int ret;
+
+	/*
+	 * Setup connector pads and links. Enable the link to the first
+	 * available connector per default.
+	 */
+	for (i = 0; i < decoder->connectors_num; i++) {
+		struct media_entity *con = &decoder->connectors[i].ent;
+		struct media_pad *pad = &decoder->connectors[i].pad;
+		unsigned int port = decoder->connectors[i].port_num;
+		bool is_svideo = decoder->connectors[i].is_svideo;
+		int flags = i ? 0 : MEDIA_LNK_FL_ENABLED;
+
+		pad->flags = MEDIA_PAD_FL_SOURCE;
+		ret = media_entity_pads_init(con, 1, pad);
+		if (ret < 0)
+			return ret;
+
+		ret = media_device_register_entity(sd->v4l2_dev->mdev, con);
+		if (ret < 0)
+			return ret;
+
+		ret = media_create_pad_link(con, 0, &sd->entity, port, flags);
+		if (ret < 0) {
+			media_device_unregister_entity(con);
+			return ret;
+		}
+
+		if (is_svideo) {
+			/* svideo links to both aip1a and aip1b */
+			ret = media_create_pad_link(con, 0, &sd->entity,
+						    port + 1, flags);
+			if (ret < 0) {
+				media_device_unregister_entity(con);
+				return ret;
+			}
+		}
+
+		/* enable default input */
+		if (flags == MEDIA_LNK_FL_ENABLED) {
+			if (is_svideo) {
+				decoder->pads_state[TVP5150_PAD_AIP1A] =
+				decoder->pads_state[TVP5150_PAD_AIP1B] =
+						TVP5150_PAD_ACTIVE_SVIDEO;
+				decoder->input = TVP5150_SVIDEO;
+			} else {
+				if (port == 0) {
+					decoder->pads_state[TVP5150_PAD_AIP1A] =
+						TVP5150_PAD_ACTIVE_COMPOSITE;
+					decoder->input = TVP5150_COMPOSITE0;
+				} else {
+					decoder->pads_state[TVP5150_PAD_AIP1B] =
+						TVP5150_PAD_ACTIVE_COMPOSITE;
+					decoder->input = TVP5150_COMPOSITE1;
+				}
+			}
+			tvp5150_selmux(sd);
+			decoder->modify_second_link = false;
+		}
+	}
+#endif
+	return 0;
+}
+
+
 /* ----------------------------------------------------------------------- */
 
 static const struct v4l2_ctrl_ops tvp5150_ctrl_ops = {
@@ -1367,6 +1614,10 @@ static const struct v4l2_subdev_ops tvp5150_ops = {
 	.pad = &tvp5150_pad_ops,
 };
 
+static const struct v4l2_subdev_internal_ops tvp5150_internal_ops = {
+	.registered = tvp5150_registered,
+};
+
 /****************************************************************************
 			I2C Client & Driver
  ****************************************************************************/
@@ -1515,38 +1766,197 @@ static int tvp5150_init(struct i2c_client *c)
 	return 0;
 }
 
-static int tvp5150_parse_dt(struct tvp5150 *decoder, struct device_node *np)
+#if defined(CONFIG_MEDIA_CONTROLLER)
+static int tvp5150_add_of_connectors(struct tvp5150 *decoder)
 {
-	struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
-	struct device_node *ep;
-	unsigned int flags;
-	int ret = 0;
+	struct device *dev = decoder->sd.dev;
+	struct device_node *rp;
+	struct of_endpoint ep;
+	struct tvp5150_connector *connectors;
+	unsigned int connectors_num = decoder->connectors_num;
+	int i, ret;
+
+	/* Allocate and initialize all available input connectors */
+	connectors = devm_kcalloc(dev, connectors_num, sizeof(*connectors),
+				  GFP_KERNEL);
+	if (!connectors)
+		return -ENOMEM;
 
-	ep = of_graph_get_next_endpoint(np, NULL);
-	if (!ep)
-		return -EINVAL;
+	for (i = 0; i < connectors_num; i++) {
+		rp = of_graph_get_remote_port_parent(decoder->endpoints[i]);
+		of_graph_parse_endpoint(decoder->endpoints[i], &ep);
+		connectors[i].port_num = ep.port;
+		connectors[i].is_svideo = !!of_device_is_compatible(rp,
+							    "svideo-connector");
 
-	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep), &bus_cfg);
-	if (ret)
-		goto err;
+		if (connectors[i].is_svideo)
+			connectors[i].ent.function = MEDIA_ENT_F_CONN_SVIDEO;
+		else
+			connectors[i].ent.function = MEDIA_ENT_F_CONN_COMPOSITE;
+
+		connectors[i].ent.flags = MEDIA_ENT_FL_CONNECTOR;
+		ret = of_property_read_string(rp, "label",
+					      &connectors[i].ent.name);
+		if (ret < 0)
+			return ret;
+	}
+
+	decoder->connectors = connectors;
+
+	return 0;
+}
+#endif
+
+static int tvp5150_mc_init(struct v4l2_subdev *sd)
+{
+#if defined(CONFIG_MEDIA_CONTROLLER)
+	struct tvp5150 *decoder = to_tvp5150(sd);
+	unsigned int i;
+	int ret;
+
+	sd->entity.ops = &tvp5150_sd_media_ops;
+	sd->entity.function = MEDIA_ENT_F_ATV_DECODER;
 
-	flags = bus_cfg.bus.parallel.flags;
+	/* Initialize all TVP5150 pads */
+	for (i = 0; i < TVP5150_NUM_PADS; i++) {
+		if (i < TVP5150_NUM_PADS - 1) {
+			decoder->pads[i].flags = MEDIA_PAD_FL_SINK;
+			decoder->pads[i].sig_type = PAD_SIGNAL_ANALOG;
+		} else {
+			decoder->pads[i].flags = MEDIA_PAD_FL_SOURCE;
+			decoder->pads[i].sig_type = PAD_SIGNAL_DV;
+		}
+	}
+	ret = media_entity_pads_init(&sd->entity, TVP5150_NUM_PADS,
+				     decoder->pads);
+	if (ret < 0)
+		goto out;
 
-	if (bus_cfg.bus_type == V4L2_MBUS_PARALLEL &&
-	    !(flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH &&
-	      flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH &&
-	      flags & V4L2_MBUS_FIELD_EVEN_LOW)) {
+	if (IS_ENABLED(CONFIG_OF))
+		ret = tvp5150_add_of_connectors(decoder);
+#endif
+out:
+	return ret;
+}
+
+static bool tvp5150_of_valid_input(struct device_node *endpoint,
+				unsigned int port, unsigned int id)
+{
+	struct device_node *rp = of_graph_get_remote_port_parent(endpoint);
+	const char *input;
+	int ret;
+
+	/* perform some basic checks needed for later mc_init */
+	switch (port) {
+	case TVP5150_PAD_AIP1A:
+		/* svideo must be connected to endpoint@1  */
+		ret = id ? of_device_is_compatible(rp, "svideo-connector") :
+			   of_device_is_compatible(rp,
+						   "composite-video-connector");
+		if (!ret)
+			return false;
+		break;
+	case TVP5150_PAD_AIP1B:
+		ret = of_device_is_compatible(rp, "composite-video-connector");
+		if (!ret)
+			return false;
+		break;
+	}
+
+	ret = of_property_read_string(rp, "label", &input);
+	if (ret < 0)
+		return false;
+
+	return true;
+}
+
+static int tvp5150_parse_dt(struct tvp5150 *decoder, struct device_node *np)
+{
+	struct device *dev = decoder->sd.dev;
+	struct v4l2_fwnode_endpoint bus_cfg = { .bus_type = 0 };
+	struct device_node *ep_np;
+	unsigned int flags;
+	int ret, i = 0, in = 0;
+	bool found = false;
+
+	/* at least 1 output and 1 input */
+	decoder->endpoints_num = of_graph_get_endpoint_count(np);
+	if (decoder->endpoints_num < 2 || decoder->endpoints_num > 4) {
 		ret = -EINVAL;
 		goto err;
 	}
 
-	decoder->mbus_type = bus_cfg.bus_type;
+	for_each_endpoint_of_node(np, ep_np) {
+		struct of_endpoint ep;
+
+		of_graph_parse_endpoint(ep_np, &ep);
+		if (decoder->endpoints[i]) {
+			/* this should never happen */
+			dev_err(dev, "Invalid endpoint %pOF on port %d\n",
+				ep.local_node, ep.port);
+				ret = -EINVAL;
+				goto err;
+		}
 
+		switch (ep.port) {
+			/* fall through */
+		case TVP5150_PAD_AIP1A:
+		case TVP5150_PAD_AIP1B:
+			if (!tvp5150_of_valid_input(ep_np, ep.port, ep.id)) {
+				dev_err(dev,
+					"Invalid endpoint %pOF on port %d\n",
+					ep.local_node, ep.port);
+				ret = -EINVAL;
+				goto err;
+			}
+			in++;
+			break;
+		case TVP5150_PAD_VID_OUT:
+			ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(ep_np),
+							 &bus_cfg);
+			if (ret)
+				goto err;
+
+			flags = bus_cfg.bus.parallel.flags;
+
+			if (bus_cfg.bus_type == V4L2_MBUS_PARALLEL &&
+			    !(flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH &&
+			      flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH &&
+			      flags & V4L2_MBUS_FIELD_EVEN_LOW)) {
+				ret = -EINVAL;
+				goto err;
+			}
+
+			decoder->mbus_type = bus_cfg.bus_type;
+			break;
+		default:
+			dev_err(dev, "Invalid port %d for endpoint %pOF\n",
+				ep.port, ep.local_node);
+			ret = -EINVAL;
+			goto err;
+		}
+
+		of_node_get(ep_np);
+		decoder->endpoints[i] = ep_np;
+		i++;
+
+		found = true;
+	}
+
+	decoder->connectors_num = in;
+	return found ? 0 : -ENODEV;
 err:
-	of_node_put(ep);
 	return ret;
 }
 
+static void tvp5150_dt_cleanup(struct tvp5150 *decoder)
+{
+	unsigned int i;
+
+	for (i = 0; i < TVP5150_NUM_PADS; i++)
+		of_node_put(decoder->endpoints[i]);
+}
+
 static const char * const tvp5150_test_patterns[2] = {
 	"Disabled",
 	"Black screen"
@@ -1585,7 +1995,7 @@ static int tvp5150_probe(struct i2c_client *c,
 		res = tvp5150_parse_dt(core, np);
 		if (res) {
 			dev_err(sd->dev, "DT parsing error: %d\n", res);
-			return res;
+			goto err_cleanup_dt;
 		}
 	} else {
 		/* Default to BT.656 embedded sync */
@@ -1593,25 +2003,16 @@ static int tvp5150_probe(struct i2c_client *c,
 	}
 
 	v4l2_i2c_subdev_init(sd, c, &tvp5150_ops);
+	sd->internal_ops = &tvp5150_internal_ops;
 	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 
-#if defined(CONFIG_MEDIA_CONTROLLER)
-	core->pads[TVP5150_PAD_IF_INPUT].flags = MEDIA_PAD_FL_SINK;
-	core->pads[TVP5150_PAD_IF_INPUT].sig_type = PAD_SIGNAL_ANALOG;
-	core->pads[TVP5150_PAD_VID_OUT].flags = MEDIA_PAD_FL_SOURCE;
-	core->pads[TVP5150_PAD_VID_OUT].sig_type = PAD_SIGNAL_DV;
-
-	sd->entity.function = MEDIA_ENT_F_ATV_DECODER;
-
-	res = media_entity_pads_init(&sd->entity, TVP5150_NUM_PADS, core->pads);
-	if (res < 0)
-		return res;
-
-#endif
+	res = tvp5150_mc_init(sd);
+	if (res)
+		goto err_cleanup_dt;
 
 	res = tvp5150_detect_version(core);
 	if (res < 0)
-		return res;
+		goto err_cleanup_dt;
 
 	core->norm = V4L2_STD_ALL;	/* Default is autodetect */
 	core->detected_norm = V4L2_STD_UNKNOWN;
@@ -1637,7 +2038,7 @@ static int tvp5150_probe(struct i2c_client *c,
 	sd->ctrl_handler = &core->hdl;
 	if (core->hdl.error) {
 		res = core->hdl.error;
-		goto err;
+		goto err_free_v4l2_ctrls;
 	}
 
 	tvp5150_set_default(tvp5150_read_std(sd), &core->rect);
@@ -1649,19 +2050,21 @@ static int tvp5150_probe(struct i2c_client *c,
 						tvp5150_isr, IRQF_TRIGGER_HIGH |
 						IRQF_ONESHOT, "tvp5150", core);
 		if (res)
-			goto err;
+			goto err_free_v4l2_ctrls;
 	}
 
 	res = v4l2_async_register_subdev(sd);
 	if (res < 0)
-		goto err;
+		goto err_free_v4l2_ctrls;
 
 	if (debug > 1)
 		tvp5150_log_status(sd);
 	return 0;
 
-err:
+err_free_v4l2_ctrls:
 	v4l2_ctrl_handler_free(&core->hdl);
+err_cleanup_dt:
+	tvp5150_dt_cleanup(core);
 	return res;
 }
 
-- 
2.20.1