From db8e94e7cf27d8bc101ef5b8ee5c1af77cd5b1c9 Mon Sep 17 00:00:00 2001 From: Sakari Ailus Date: Tue, 5 Jul 2016 11:41:15 +0200 Subject: [PATCH] media: v4l: subdev: Improve link format validation debug messages The existing link format validation failure debug message in media-entity.c helped to pinpoint the point of failure but provided no additional information what's wrong. Tell the user exactly why the validation failed. Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab --- drivers/media/v4l2-core/v4l2-subdev.c | 48 ++++++++++++++++++++++++++++++----- 1 file changed, 41 insertions(+), 7 deletions(-) diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index a7d508e..956dafa 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -792,21 +792,55 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, struct v4l2_subdev_format *source_fmt, struct v4l2_subdev_format *sink_fmt) { + bool pass = true; + /* The width, height and code must match. */ - if (source_fmt->format.width != sink_fmt->format.width - || source_fmt->format.height != sink_fmt->format.height - || source_fmt->format.code != sink_fmt->format.code) - return -EPIPE; + if (source_fmt->format.width != sink_fmt->format.width) { + dev_dbg(sd->entity.graph_obj.mdev->dev, + "%s: width does not match (source %u, sink %u)\n", + __func__, + source_fmt->format.width, sink_fmt->format.width); + pass = false; + } + + if (source_fmt->format.height != sink_fmt->format.height) { + dev_dbg(sd->entity.graph_obj.mdev->dev, + "%s: height does not match (source %u, sink %u)\n", + __func__, + source_fmt->format.height, sink_fmt->format.height); + pass = false; + } + + if (source_fmt->format.code != sink_fmt->format.code) { + dev_dbg(sd->entity.graph_obj.mdev->dev, + "%s: media bus code does not match (source 0x%8.8x, sink 0x%8.8x)\n", + __func__, + source_fmt->format.code, sink_fmt->format.code); + pass = false; + } /* The field order must match, or the sink field order must be NONE * to support interlaced hardware connected to bridges that support * progressive formats only. */ if (source_fmt->format.field != sink_fmt->format.field && - sink_fmt->format.field != V4L2_FIELD_NONE) - return -EPIPE; + sink_fmt->format.field != V4L2_FIELD_NONE) { + dev_dbg(sd->entity.graph_obj.mdev->dev, + "%s: field does not match (source %u, sink %u)\n", + __func__, + source_fmt->format.field, sink_fmt->format.field); + pass = false; + } - return 0; + if (pass) + return 0; + + dev_dbg(sd->entity.graph_obj.mdev->dev, + "%s: link was \"%s\":%u -> \"%s\":%u\n", __func__, + link->source->entity->name, link->source->index, + link->sink->entity->name, link->sink->index); + + return -EPIPE; } EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); -- 2.7.4