Add rpm trace log for log 1, the coming behavior is expected,
the usb subsystem will enters low power mode again.
root@freescale ~$ cat /sys/kernel/debug/tracing/trace
# tracer: nop
#
# entries-in-buffer/entries-written: 156/156 #P:4
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
<idle>-0 [000] d.h. 48.691373: rpm_resume: ci_hdrc.0 flags-5 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] dNh. 48.691389: rpm_return_int: rpm_resume+0x94/0x750:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 48.691415: rpm_resume: ci_hdrc.0 flags-2 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.691418: rpm_resume: 2184000.usb flags-0 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.703000: rpm_idle: ci_hdrc.0 flags-5 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.703004: rpm_return_int: rpm_idle+0x4c/0x228:ci_hdrc.0 ret=-11
kworker/0:1-53 [000] d... 48.708896: rpm_idle: 2184000.usb flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708899: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=-11
kworker/0:1-53 [000] d... 48.708902: rpm_idle: 2100000.aips-bus flags-5 cnt-0 dep-1 auto-1 p-0 irq-0 child-1
kworker/0:1-53 [000] d... 48.708903: rpm_return_int: rpm_idle+0x4c/0x228:2100000.aips-bus ret=-13
kworker/0:1-53 [000] d... 48.708905: rpm_return_int: rpm_resume+0x94/0x750:2184000.usb ret=0
kworker/0:1-53 [000] d... 48.708908: rpm_idle: ci_hdrc.0 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708911: rpm_suspend: ci_hdrc.0 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708913: rpm_idle: 2184000.usb flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708915: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=-11
kworker/0:1-53 [000] d... 48.708917: rpm_return_int: rpm_suspend+0x370/0x6a0:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 48.708918: rpm_return_int: rpm_idle+0x4c/0x228:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 48.708920: rpm_idle: 2184000.usb flags-5 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708923: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=0
kworker/0:1-53 [000] d... 48.708925: rpm_return_int: rpm_resume+0x94/0x750:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 48.708944: rpm_resume: usb1 flags-4 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708947: rpm_resume: ci_hdrc.0 flags-0 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708949: rpm_idle: ci_hdrc.0 flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.708951: rpm_return_int: rpm_idle+0x4c/0x228:ci_hdrc.0 ret=-11
kworker/0:1-53 [000] d... 48.708952: rpm_return_int: rpm_resume+0x94/0x750:ci_hdrc.0 ret=1
kworker/0:1-53 [000] dN.. 48.710126: rpm_idle: usb1 flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] dN.. 48.710130: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=-11
kworker/0:1-53 [000] dN.. 48.710132: rpm_idle: ci_hdrc.0 flags-5 cnt-0 dep-0 auto-1 p-0 irq-0 child-1
kworker/0:1-53 [000] dN.. 48.710133: rpm_return_int: rpm_idle+0x4c/0x228:ci_hdrc.0 ret=-16
kworker/0:1-53 [000] dN.. 48.710135: rpm_return_int: rpm_resume+0x94/0x750:usb1 ret=0
kworker/0:1-53 [000] d... 48.710168: rpm_suspend: usb1 flags-c cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.710172: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
kworker/0:1-53 [000] dN.. 48.710181: rpm_idle: 2184000.usb flags-2 cnt-0 dep-0 auto-1 p-0 irq-0 child-1
kworker/0:1-53 [000] dN.. 48.710183: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=-16
khubd-27 [000] d... 48.710192: rpm_resume: 1-0:1.0 flags-4 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 48.710195: rpm_idle: 1-0:1.0 flags-1 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 48.710197: rpm_return_int: rpm_idle+0x4c/0x228:1-0:1.0 ret=-11
khubd-27 [000] d... 48.710199: rpm_return_int: rpm_resume+0x94/0x750:1-0:1.0 ret=1
khubd-27 [000] d... 48.710204: rpm_idle: 1-0:1.0 flags-4 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 48.710205: rpm_suspend: 1-0:1.0 flags-4 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 48.710208: rpm_idle: usb1 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 48.710216: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=0
khubd-27 [000] d... 48.710218: rpm_return_int: rpm_suspend+0x370/0x6a0:1-0:1.0 ret=0
khubd-27 [000] d... 48.710220: rpm_return_int: rpm_idle+0x4c/0x228:1-0:1.0 ret=0
kworker/0:1-53 [000] d... 48.710227: rpm_idle: usb1 flags-2 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 48.710231: rpm_suspend: usb1 flags-8 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworketurn_int: rpm_idle+0x4c/0x228:usb1 ret=0
<idle>-0 [000] d.s. 51.064227: rpm_suspend: usb1 flags-9 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] dNs. 51.064238: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
kworker/0:1-53 [000] d... 51.064266: rpm_suspend: usb1 flags-a cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] dN.. 51.065471: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
khubd-27 [000] d... 51.065501: rpm_resume: 1-0:1.0 flags-4 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.065505: rpm_idle: 1-0:1.0 flags-1 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.065507: rpm_return_int: rpm_idle+0x4c/0x228:1-0:1.0 ret=-11
khubd-27 [000] d... 51.065508: rpm_return_int: rpm_resume+0x94/0x750:1-0:1.0 ret=1
khubd-27 [000] d... 51.084266: rpm_resume: 1-1 flags-4 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.084271: rpm_resume: usb1 flags-0 cnt-1 dep-0 auto-1 p-0 irq-0 child-1
khubd-27 [000] d... 51.084273: rpm_return_int: rpm_resume+0x94/0x750:usb1 ret=1
khubd-27 [000] d... 51.189917: rpm_idle: 1-1 flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189921: rpm_return_int: rpm_idle+0x4c/0x228:1-1 ret=-11
khubd-27 [000] d... 51.189923: rpm_idle: usb1 flags-5 cnt-0 dep-0 auto-1 p-0 irq-0 child-2
khubd-27 [000] d... 51.189925: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=-16
khubd-27 [000] d... 51.189927: rpm_return_int: rpm_resume+0x94/0x750:1-1 ret=0
khubd-27 [000] d... 51.189929: rpm_suspend: 1-1 flags-c cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189933: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1 ret=0
khubd-27 [000] d... 51.189964: rpm_idle: 1-0:1.0 flags-4 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189966: rpm_suspend: 1-0:1.0 flags-4 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189969: rpm_idle: usb1 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-1
khubd-27 [000] d... 51.189971: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=-16
khubd-27 [000] d... 51.189972: rpm_return_int: rpm_suspend+0x370/0x6a0:1-0:1.0 ret=0
khubd-27 [000] d... 51.189974: rpm_return_int: rpm_idle+0x4c/0x228:1-0:1.0 ret=0
khubd-27 [000] d... 51.189991: rpm_resume: 1-1:1.0 flags-4 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189994: rpm_idle: 1-1:1.0 flags-1 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.189995: rpm_return_int: rpm_idle+0x4c/0x228:1-1:1.0 ret=-11
khubd-27 [000] d... 51.189997: rpm_return_int: rpm_resume+0x94/0x750:1-1:1.0 ret=1
khubd-27 [000] d... 51.214266: rpm_resume: 1-1.1 flags-4 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.214270: rpm_resume: 1-1 flags-0 cnt-1 dep-0 auto-1 p-0 irq-0 child-1
khubd-27 [000] d... 51.214272: rpm_return_int: rpm_resume+0x94/0x750:1-1 ret=1
khubd-27 [000] d... 51.223913: rpm_idle: 1-1.1 flags-1 cnt-1 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.223916: rpm_return_int: rpm_idle+0x4c/0x228:1-1.1 ret=-11
khubd-27 [000] d... 51.223919: rpm_idle: 1-1 flags-5 cnt-0 dep-0 auto-1 p-0 irq-0 child-2
khubd-27 [000] d... 51.223920: rpm_return_int: rpm_idle+0x4c/0x228:1-1 ret=-16
khubd-27 [000] d... 51.223922: rpm_return_int: rpm_resume+0x94/0x750:1-1.1 ret=0
khubd-27 [000] d... 51.223925: rpm_suspend: 1-1.1 flags-c cnt-0 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.223929: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1.1 ret=0
khubd-27 [000] d... 51.223967: rpm_resume: 1-1:1.0 flags-4 cnt-2 dep-0 auto-1 p-0 irq-0 child-0
khubd-27 [000] d... 51.223971: rpm_return_int: rpm_resume+0x94/0x75rn_int: rpm_suspend+0x370/0x6a0:1-1.1 ret=0
kworker/0:1-53 [000] d... 53.234263: rpm_suspend: 1-1.1 flags-a cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 53.264245: rpm_idle: 1-1 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 53.264251: rpm_return_int: rpm_idle+0x4c/0x228:1-1 ret=0
kworker/0:1-53 [000] d... 53.264253: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1.1 ret=0
kworker/0:1-53 [000] d... 53.264256: rpm_idle: 1-1 flags-2 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 53.264259: rpm_suspend: 1-1 flags-8 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 53.264263: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1 ret=0
kworker/0:1-53 [000] d... 53.264265: rpm_return_int: rpm_idle+0x4c/0x228:1-1 ret=0
<idle>-0 [000] d.s. 55.064227: rpm_suspend: 1-1 flags-9 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] d.s. 55.064232: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1 ret=0
<idle>-0 [000] d.s. 55.264222: rpm_suspend: 1-1 flags-9 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] dNs. 55.264232: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1 ret=0
kworker/0:1-53 [000] d... 55.264256: rpm_suspend: 1-1 flags-a cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 55.284247: rpm_idle: usb1 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 55.284252: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=0
kworker/0:1-53 [000] d... 55.284254: rpm_return_int: rpm_suspend+0x370/0x6a0:1-1 ret=0
kworker/0:1-53 [000] d... 55.284257: rpm_idle: usb1 flags-2 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 55.284261: rpm_suspend: usb1 flags-8 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 55.284264: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
kworker/0:1-53 [000] d... 55.284267: rpm_return_int: rpm_idle+0x4c/0x228:usb1 ret=0
<idle>-0 [000] d.s. 57.064233: rpm_suspend: usb1 flags-9 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] d.s. 57.064239: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
<idle>-0 [000] d.s. 57.284222: rpm_suspend: usb1 flags-9 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
<idle>-0 [000] dNs. 57.284233: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
kworker/0:1-53 [000] d... 57.284253: rpm_suspend: usb1 flags-a cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284652: rpm_idle: ci_hdrc.0 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284655: rpm_suspend: ci_hdrc.0 flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284658: rpm_idle: 2184000.usb flags-1 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284661: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=0
kworker/0:1-53 [000] d... 57.284664: rpm_return_int: rpm_suspend+0x370/0x6a0:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 57.284665: rpm_return_int: rpm_idle+0x4c/0x228:ci_hdrc.0 ret=0
kworker/0:1-53 [000] d... 57.284667: rpm_return_int: rpm_suspend+0x370/0x6a0:usb1 ret=0
kworker/0:1-53 [000] d... 57.284670: rpm_idle: 2184000.usb flags-2 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284684: rpm_idle: 2184000.usb flags-0 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.284686: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=-115
kworker/0:1-53 [000] d... 57.284689: rpm_suspend: 2184000.usb flags-0 cnt-0 dep-0 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.295547: rpm_idle: 2100000.aips-bus flags-1 cnt-0 dep-1 auto-1 p-0 irq-0 child-0
kworker/0:1-53 [000] d... 57.295550: rpm_return_int: rpm_idle+0x4c/0x228:2100000.aips-bus ret=-13
kworker/0:1-53 [000] d... 57.295552: rpm_return_int: rpm_suspend+0x370/0x6a0:2184000.usb ret=0
kworker/0:1-53 [000] d... 57.295554: rpm_return_int: rpm_idle+0x4c/0x228:2184000.usb ret=0
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