Commits
Zhang Jiejing committed 43681cabc16
ENGR00133978 PM: add time sensitive debug function to suspend & resume There was some driver is slow on suspend/resume, but some embeded system like eReader,Cellphone are time sensitive,this commit will report the slow driver on suspend/resume, the default value is 500us(0.5ms) Also, the threshold can be change by modify '/sys/power/device_suspend_time_threshold' to change the threshold, it is in microsecond. The output is like: PM: device platform:soc-audio.2 suspend too slow, takes 606.696 msecs PM: device platform:mxc_sdc_fb.1 suspend too slow, takes 7.708 msecs the default state of suspend driver is default off, if you want to debug the suspend time, echo time in microsecond(u Second) to /sys/powe/device_suspend_time_threshold eg: I want to know which driver suspend & resume takes more that 0.5 ms (500 us), you can just : ehco 500 > /sys/power/device_suspend_time_threshold Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>