[FEATURE] dump PM stats on suspend-resume rtcwake error #898
Description
Is your feature request related to a problem? Please describe.
we routinely have suspend/resume failures with rtcwake reporting a write error
I believe this case happens when we see the error in dmesg
"Some devices failed to suspend, or early wake event detected"
I will make the conjecture that 90% of the current 'errors' are related to this message. Since it's cryptic, we would need additional information to figure out if issues are audio-related or not, and in the latter case investigate if they are severe or not.
Describe the solution you'd like
dump all the information provided in /sys/power/susped_stats, and check if the numbers reported in failed_suspend/failed_resume increase during cycles
root@pbossart-mobl3:/sys/power/suspend_stats# ls
fail failed_resume failed_suspend last_failed_dev success
failed_freeze failed_resume_early failed_suspend_late last_failed_errno
failed_prepare failed_resume_noirq failed_suspend_noirq last_failed_step
What is specifically interesting is the 'last_failed_dev' string which should tell us if the problem is audio -related or not.
Describe alternatives you've considered
modify the kernel so that __pm_pr_dbg provides the results in all cases, not just when the log level is DEBUG.