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

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

Hi Jacopo,

first thanks for your review and sorry for the delayed reply.

On 19-03-21 14:03, Jacopo Mondi wrote:
> On Tue, Jan 29, 2019 at 05:07:52PM +0100, Marco Felsch wrote:
> > 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);
> 
> could this return -1 ? Is this an error?

Yes it could return -1. This indicates that no pads are active so it
isn't a error.

> > +
> > +	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);
> > +		}
> 
> I admit I didn't get how you use modify_second_link and s_routing(),
> so I'll just assume it's correct :)

Sorry for that.. I should add a comment here since it isn't intuitive.
My goal was to enable/disable both connector links in one shot in case
of s-video. I solved that using a recursion calling tvp5150_link_setup()
a second time. Maybe I have to reconsidering about that implementation
since it is a bit counter intuitve or at least adding a comment above.

> > +	} 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) {
> 
> No need for "> 0"

Yes, I will change that.

> > +			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);
> 
> This would link to aip1b endpoint@0, right? It seems from your DT
> bindings example that it is accepted to have aip1b with a composite
> endpoint and an s_video endpoint@1 in aip1a, isn't it?

Yes and yes. The documentation layout is the result of a longer
port/endpoint discussion. In real the HW has only two input port (no
dedicated s-video port). The s-video "port" is archived enabling both
AIP1A and AIP1B port.

> 
> > +			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;
> 
> if CONFIG_MEDIA_CONTROLLER is not enabled, ret is not defined.
> Also please consider making a stub in the #else branch where you just
> return 0;

You're absolutly right. I will change that, thanks.

> 
> As a general note, try to build without media controller support, I
> see a few errors.

Okay, I'm trying that and fix those errors.

> > +}
> > +
> > +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;
> 
> What are you using 'input' for, to make sure the property is there as
> you use it later? Be aware that "label" is not mandatory for
> connectors, and you need it only when media controller is enabled. If
> you fail here, it will fail also for non-media controller devices that
> do not need it. I would drop the check.

You're right. The label is used later on to set the connector entity
name. There is a second patchset fyling around which introduces a
generic parsing routine which fixing this too. I should merge those
two sets into one for the next round.

> > +
> > +	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 };
> 
> please use V4L2_MBUS_UNKNOWN instead of 0

Okay.

> > +	struct device_node *ep_np;
> > +	unsigned int flags;
> > +	int ret, i = 0, in = 0;
> > +	bool found = false;
> > +
> > +	/* at least 1 output and 1 input */
> 
> Nitpicking: some comments start with lowercase other with upper case.
> Also, sometimes there's a full stop  at the end of the statement,
> sometimes not.

Okay I will fix that too.

> > +	decoder->endpoints_num = of_graph_get_endpoint_count(np);
> > +	if (decoder->endpoints_num < 2 || decoder->endpoints_num > 4) {
> 
> I would print an error, as bindings are wrong and this should appear
> in boot logs.

Okay.

> >  		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]) {
> 
> Can you trigger this error condition with wrong bindings? I don't
> think so. This is a development error, and if your code is correct,
> this won't happen. I would drop the check, if I'm not mistaken.

Yes, it's a dev error of course I can drop it to make it cleaner.

> > +			/* 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);
> 
> > +				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)) {
> 
> There's a bit of confusion in bindings related to this.
> The properties are listed as required, then it says if none are
> specified it is assumed embedded BT.656 sync, and indeed here you want
> all of them to be present to accept the bus as parallel.

Yes I was confused too during checking your feedback but then I covered
it hopefully right. This piece of code will only fail if we are in
V4L2_MBUS_PARALLEL mode (with discrete sync) because the sync signals are
pinned to that levels by the hardware. If non of these three properties
are specified the v4l2_fwnode_endpoint_parse() will set the bus_type to
V4L2_MBUS_BT656.

So I think the test it correct but maybe we need to adapt the bindings
a bit.

Regards,
	Marco

> So you either make them optional, or use 'bus-type'
> property and use the newly introduced bus hints to
> v4l2_fwnode_endpoint_parse and try to parse
> V4L2_MBUS_PARALLEL first, V4L2_MBUS_BT656 if parallel fails, and
> return an error otherwise.
>
> I think making the properties optional is the easiest way, you're
> touching bindings anyway in the next patch.
> 
> Thanks
>    j
> 
> > +				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
> >



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