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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Cc: linux-media@vger.kernel.org, sakari.ailus@linux.intel.com,
	Jacopo Mondi <jacopo+renesas@jmondi.org>,
	niklas.soderlund+renesas@ragnatech.se,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>
Subject: Re: [PATCH v5 22/24] v4l: subdev: add v4l2_subdev_get_format_dir()
Date: Sun, 18 Apr 2021 22:04:35 +0300
Message-ID: <YHyCwzfrhVFkPXoW@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20210415130450.421168-23-tomi.valkeinen@ideasonboard.com>

Hi Tomi,

Thank you for the patch.

On Thu, Apr 15, 2021 at 04:04:48PM +0300, Tomi Valkeinen wrote:
> Add v4l2_subdev_get_format_dir() which can be used to find subdev format
> for a specific stream on a multiplexed pad. The function will follow the
> routes and links until it finds a non-multiplexed pad.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---
>  drivers/media/v4l2-core/v4l2-subdev.c | 96 +++++++++++++++++++++++++++
>  include/media/v4l2-subdev.h           | 26 ++++++++
>  2 files changed, 122 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 7a4f71d8c6c3..430dbdaab080 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -998,6 +998,102 @@ bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
>  }
>  EXPORT_SYMBOL_GPL(v4l2_subdev_has_route);
>  
> +int v4l2_subdev_get_format_dir(struct media_pad *pad, u16 stream,
> +			       enum v4l2_direction dir,
> +			       struct v4l2_subdev_format *fmt)
> +{
> +	struct device *dev = pad->entity->graph_obj.mdev->dev;
> +	int ret;
> +	int i;
> +
> +	dev_dbg(dev, "%s '%s':%u:%u %s\n", __func__,
> +		pad->entity->name, pad->index, stream,
> +		dir == V4L2_DIR_SOURCEWARD ? "sourceward" : "sinkward");
> +
> +	while (true) {
> +		struct v4l2_subdev_krouting routing;
> +		struct v4l2_subdev_route *route;
> +
> +		if (pad->entity->obj_type != MEDIA_ENTITY_TYPE_V4L2_SUBDEV)
> +			return -EINVAL;
> +
> +		ret = v4l2_subdev_link_validate_get_format(pad, fmt);
> +		if (ret == 0)
> +			return 0;
> +		else if (ret != -ENOIOCTLCMD)
> +			return ret;
> +
> +		if (pad->flags &
> +		    (dir == V4L2_DIR_SINKWARD ? MEDIA_PAD_FL_SOURCE :
> +						MEDIA_PAD_FL_SINK)) {
> +			pad = media_entity_remote_pad(pad);
> +
> +			if (!pad)
> +				return -EINVAL;
> +
> +			if (pad->entity->obj_type != MEDIA_ENTITY_TYPE_V4L2_SUBDEV)
> +				return -EINVAL;
> +
> +			ret = v4l2_subdev_link_validate_get_format(pad, fmt);
> +			if (ret == 0)
> +				return 0;
> +			else if (ret != -ENOIOCTLCMD)
> +				return ret;
> +		}
> +
> +		ret = v4l2_subdev_get_krouting(media_entity_to_v4l2_subdev(pad->entity), &routing);
> +		if (ret)
> +			return ret;
> +
> +		route = NULL;
> +		for (i = 0; i < routing.num_routes; ++i) {
> +			u16 near_pad = dir == V4L2_DIR_SINKWARD ?
> +					       routing.routes[i].sink_pad :
> +					       routing.routes[i].source_pad;
> +			u16 near_stream = dir == V4L2_DIR_SINKWARD ?
> +						  routing.routes[i].sink_stream :
> +						  routing.routes[i].source_stream;
> +
> +			if (!(routing.routes[i].flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
> +				continue;
> +
> +			if (near_pad != pad->index)
> +				continue;
> +
> +			if (near_stream != stream)
> +				continue;
> +
> +			if (route) {
> +				dev_err(dev,
> +					"%s: '%s' has multiple active routes for stream %u\n",
> +					__func__, pad->entity->name, stream);
> +				v4l2_subdev_free_routing(&routing);
> +				return -EINVAL;
> +			}
> +
> +			route = &routing.routes[i];
> +		}
> +
> +		if (!route) {
> +			dev_err(dev, "%s: no route found in '%s' for stream %u\n",
> +				__func__, pad->entity->name, stream);
> +			v4l2_subdev_free_routing(&routing);
> +			return -EINVAL;
> +		}
> +
> +		if (dir == V4L2_DIR_SINKWARD) {
> +			pad = &pad->entity->pads[route->source_pad];
> +			stream = route->source_stream;
> +		} else {
> +			pad = &pad->entity->pads[route->sink_pad];
> +			stream = route->sink_stream;
> +		}
> +
> +		v4l2_subdev_free_routing(&routing);
> +	}
> +}
> +EXPORT_SYMBOL_GPL(v4l2_subdev_get_format_dir);
> +
>  int v4l2_subdev_link_validate(struct media_link *link)
>  {
>  	struct v4l2_subdev *sink;
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 1843b77dd843..730631f9a091 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -1239,4 +1239,30 @@ void v4l2_subdev_cpy_routing(struct v4l2_subdev_krouting *dst,
>  bool v4l2_subdev_has_route(struct v4l2_subdev_krouting *routing,
>  			   unsigned int pad0, unsigned int pad1);
>  
> +/**
> + * enum v4l2_direction - Direction either towards the source or the sink
> + *
> + * @V4L2_DIR_SOURCEWARD: Direction towards the source.
> + * @V4L2_DIR_SINKWARD: Direction towards the sink.
> + */
> +enum v4l2_direction {
> +	V4L2_DIR_SOURCEWARD,
> +	V4L2_DIR_SINKWARD,
> +};
> +
> +/**
> + * v4l2_subdev_get_format_dir() - Find format by following streams

The name is a bit cryptic, and the usage pattern error-prone. Can we do
better ?  In particular, if we could limit the usage of this function to
be called on a non-multiplexed pad, we could drop the stream argument.
Deducing the direction argument from the type of pad would also make the
API simpler.

> + * @pad: The pad from which to start the search
> + * @stream: The stream for which we want to find the format
> + * @dir: The direction of the search
> + * @fmt: Pointer to &struct v4l2_subdev_format where the found format is stored
> + *
> + * This function attempts to find v4l2_subdev_format for a specific stream on a
> + * multiplexed pad by following the stream using routes and links to the specified
> + * direction, until a non-multiplexed pad is found.
> + */
> +int v4l2_subdev_get_format_dir(struct media_pad *pad, u16 stream,
> +			       enum v4l2_direction dir,
> +			       struct v4l2_subdev_format *fmt);
> +
>  #endif

-- 
Regards,

Laurent Pinchart

  reply index

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15 13:04 [PATCH v5 00/24] v4l: subdev internal routing Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 01/24] media: entity: Use pad as a starting point for graph walk Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 02/24] media: entity: Use pads instead of entities in the media graph walk stack Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 03/24] media: entity: Walk the graph based on pads Tomi Valkeinen
2021-04-18 17:47   ` Laurent Pinchart
2021-04-20 11:30     ` Sakari Ailus
2021-04-15 13:04 ` [PATCH v5 04/24] v4l: mc: Start walk from a specific pad in use count calculation Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 05/24] media: entity: Add iterator helper for entity pads Tomi Valkeinen
2021-04-18 17:52   ` Laurent Pinchart
2021-04-22 12:04     ` Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 06/24] media: entity: Move the pipeline from entity to pads Tomi Valkeinen
2021-04-18 18:00   ` Laurent Pinchart
2021-04-20 11:38     ` Sakari Ailus
2021-04-15 13:04 ` [PATCH v5 07/24] media: entity: Use pad as the starting point for a pipeline Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 08/24] media: entity: Add has_route entity operation Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 09/24] media: entity: Add media_entity_has_route() function Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 10/24] media: entity: Use routing information during graph traversal Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 11/24] media: entity: Skip link validation for pads to which there is no route to Tomi Valkeinen
2021-04-18 18:06   ` Laurent Pinchart
2021-04-20 11:41     ` Sakari Ailus
2021-04-23 12:37       ` Tomi Valkeinen
2021-04-29 12:06         ` Sakari Ailus
2021-04-29 14:10           ` Laurent Pinchart
2021-04-15 13:04 ` [PATCH v5 12/24] media: entity: Add an iterator helper for connected pads Tomi Valkeinen
2021-04-18 18:20   ` Laurent Pinchart
2021-04-20 11:48     ` Sakari Ailus
2021-04-29  1:33       ` Laurent Pinchart
2021-04-29 11:56         ` Sakari Ailus
2021-04-29 12:04           ` Tomi Valkeinen
2021-04-29 12:07             ` Sakari Ailus
2021-04-29 12:14               ` Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 13/24] media: entity: Add only connected pads to the pipeline Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 14/24] media: entity: Add debug information in graph walk route check Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 15/24] v4l: Add bus type to frame descriptors Tomi Valkeinen
2021-04-18 19:23   ` Laurent Pinchart
2021-04-20 11:50     ` Sakari Ailus
2021-04-22 12:30       ` Tomi Valkeinen
2021-04-29 11:58         ` Sakari Ailus
2021-04-29 14:09           ` Laurent Pinchart
2021-04-15 13:04 ` [PATCH v5 16/24] v4l: Add CSI-2 bus configuration " Tomi Valkeinen
2021-04-18 19:24   ` Laurent Pinchart
2021-04-20 16:32     ` Sakari Ailus
2021-04-15 13:04 ` [PATCH v5 17/24] v4l: Add stream to frame descriptor Tomi Valkeinen
2021-04-18 19:27   ` Laurent Pinchart
2021-04-22 12:47     ` Tomi Valkeinen
2021-04-22 16:18       ` Laurent Pinchart
2021-04-15 13:04 ` [PATCH v5 18/24] v4l: subdev: Add [GS]_ROUTING subdev ioctls and operations Tomi Valkeinen
2021-04-18 18:32   ` Laurent Pinchart
2021-04-22 11:16     ` Tomi Valkeinen
2021-04-22 16:20       ` Laurent Pinchart
2021-04-22 16:58         ` Tomi Valkeinen
2021-04-20 16:35   ` Sakari Ailus
2021-04-15 13:04 ` [PATCH v5 19/24] media: Documentation: Add GS_ROUTING documentation Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 20/24] v4l: mc: Add an S_ROUTING helper function for power state changes Tomi Valkeinen
2021-04-18 18:55   ` Laurent Pinchart
2021-04-20 16:41     ` Sakari Ailus
2021-04-15 13:04 ` [PATCH v5 21/24] v4l: subdev: routing kernel helper functions Tomi Valkeinen
2021-04-18 19:18   ` Laurent Pinchart
2021-04-15 13:04 ` [PATCH v5 22/24] v4l: subdev: add v4l2_subdev_get_format_dir() Tomi Valkeinen
2021-04-18 19:04   ` Laurent Pinchart [this message]
2021-04-21 13:04     ` Tomi Valkeinen
2021-04-29  1:43       ` Laurent Pinchart
2021-05-04  6:49         ` Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 23/24] v4l: subdev: Take routing information into account in link validation Tomi Valkeinen
2021-04-15 13:04 ` [PATCH v5 24/24] v4l: subdev: increase V4L2_FRAME_DESC_ENTRY_MAX to 8 Tomi Valkeinen
2021-04-18 19:06   ` Laurent Pinchart
2021-04-16  8:38 ` [PATCH v5 00/24] v4l: subdev internal routing Niklas Söderlund
2021-04-16  8:47   ` Tomi Valkeinen
2021-04-16  8:56     ` Niklas Söderlund
2021-04-18 17:32 ` Laurent Pinchart
2021-04-21 12:57   ` Tomi Valkeinen
2021-04-29  1:27     ` Laurent Pinchart

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