diff options
| author | Tony Lindgren <[email protected]> | 2021-06-04 11:05:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2021-06-14 10:25:16 +0200 |
| commit | 318324e6df9787f8ec06660224f555471c8f36d1 (patch) | |
| tree | b222a78dde6e3226163904442ad25682c8c1f857 /tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py | |
| parent | e2ff8815f3d4dc082d60e261d3f8c80896ad4078 (diff) | |
usb: musb: Implement tracing for state change events
The devctl register on musb is the only way to get state information
on musb. The hardware can easily get confused because it tries to do
things on it's own automagically, and things like slow VBUS rise can
make things fail.
Let's make it easier to debug the ongoing state change issues that
keep popping up on regular basis and add tracing support.
With these changes we can easily trace musb state change events with:
echo 1 > /sys/kernel/debug/tracing/events/musb/musb_state/enable
cat /sys/kernel/debug/tracing/trace_pipe
echo 0 > /sys/kernel/debug/tracing/events/musb/musb_state/enable
Cc: Alexandre Belloni <[email protected]>
Cc: Andreas Kemnade <[email protected]>
Cc: Bhushan Shah <[email protected]>
Cc: Drew Fustini <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/Perf-Trace-Util/lib/Perf/Trace/EventClass.py')
0 files changed, 0 insertions, 0 deletions