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media: visl: use canonical ftrace path

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The canonical location for the tracefs filesystem is at
/sys/kernel/tracing.

But, from Documentation/trace/ftrace.rst:

  Before 4.1, all ftrace tracing control files were within the debugfs
  file system, which is typically located at /sys/kernel/debug/tracing.
  For backward compatibility, when mounting the debugfs file system,
  the tracefs file system will be automatically mounted at:

  /sys/kernel/debug/tracing

Update the visl decoder driver documentation to use this tracefs path.

Signed-off-by: Ross Zwisler <zwisler@google.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Ross Zwisler 2023-08-29 14:46:01 -06:00 committed by Hans Verkuil
parent 1fd6eb1264
commit 85b901e600
1 changed files with 3 additions and 3 deletions
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6
Documentation/admin-guide/media/visl.rst
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@ -78,7 +78,7 @@ The trace events are defined on a per-codec basis, e.g.:
.. code-block:: bash
$ ls /sys/kernel/debug/tracing/events/ | grep visl
$ ls /sys/kernel/tracing/events/ | grep visl
visl_fwht_controls
visl_h264_controls
visl_hevc_controls
@ -90,13 +90,13 @@ For example, in order to dump HEVC SPS data:
.. code-block:: bash
$ echo 1 > /sys/kernel/debug/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
$ echo 1 > /sys/kernel/tracing/events/visl_hevc_controls/v4l2_ctrl_hevc_sps/enable
The SPS data will be dumped to the trace buffer, i.e.:
.. code-block:: bash
$ cat /sys/kernel/debug/tracing/trace
$ cat /sys/kernel/tracing/trace
video_parameter_set_id 0
seq_parameter_set_id 0
pic_width_in_luma_samples 1920