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Subject: media: v4l: subdev: Print debug information on frame descriptor
Author: Sakari Ailus <sakari.ai...@linux.intel.com>
Date: Tue Sep 12 14:55:24 2023 +0300
Print debug level information on returned frame descriptors.
Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
drivers/media/v4l2-core/v4l2-subdev.c | 31 ++++++++++++++++++++++++++++++-
1 file changed, 30 insertions(+), 1 deletion(-)
---
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c
b/drivers/media/v4l2-core/v4l2-subdev.c
index 9cb04ace86ae..d295a4e87b66 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -15,6 +15,7 @@
#include <linux/module.h>
#include <linux/overflow.h>
#include <linux/slab.h>
+#include <linux/string.h>
#include <linux/types.h>
#include <linux/version.h>
#include <linux/videodev2.h>
@@ -309,9 +310,37 @@ static int call_set_selection(struct v4l2_subdev *sd,
static int call_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad,
struct v4l2_mbus_frame_desc *fd)
{
+ unsigned int i;
+ int ret;
+
memset(fd, 0, sizeof(*fd));
- return sd->ops->pad->get_frame_desc(sd, pad, fd);
+ ret = sd->ops->pad->get_frame_desc(sd, pad, fd);
+ if (ret)
+ return ret;
+
+ dev_dbg(sd->dev, "Frame descriptor on pad %u, type %s\n", pad,
+ fd->type == V4L2_MBUS_FRAME_DESC_TYPE_PARALLEL ? "parallel" :
+ fd->type == V4L2_MBUS_FRAME_DESC_TYPE_CSI2 ? "CSI-2" :
+ "unknown");
+
+ for (i = 0; i < fd->num_entries; i++) {
+ struct v4l2_mbus_frame_desc_entry *entry = &fd->entry[i];
+ char buf[20] = "";
+
+ if (fd->type == V4L2_MBUS_FRAME_DESC_TYPE_CSI2)
+ WARN_ON(snprintf(buf, sizeof(buf),
+ ", vc %u, dt 0x%02x",
+ entry->bus.csi2.vc,
+ entry->bus.csi2.dt) >= sizeof(buf));
+
+ dev_dbg(sd->dev,
+ "\tstream %u, code 0x%04x, length %u, flags 0x%04x%s\n",
+ entry->stream, entry->pixelcode, entry->length,
+ entry->flags, buf);
+ }
+
+ return 0;
}
static inline int check_edid(struct v4l2_subdev *sd,
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