休眠时，usb会被唤醒，如何解决？
板子按下power休眠后，usb会被唤醒，这该怎么解决？打印如下：
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wakeup gpio0x00000000:0x10000000
cpufreq: cpufreq_suspend: Failed to stop governor for policy: c58dc540
cpufreq: cpufreq_suspend: Failed to stop governor for policy: c58dc540
bcmsdh_sdmmc_suspend Enter func->num=1
bcmsdh_sdmmc_suspend Enter func->num=2
bcmsdh_sdmmc_suspend Exit
dwc_otg_hcd_resume, usb device mode
dwc_otg_hcd_suspend, usb device mode
hym8563_rtc_set_alarm:diff_sec= 55s , use time
battery suspend dl=0 rl=0 c=0 v=4200 at=55 st=0x0 chg=1
: Enter rfkill_wlan_suspend
phy_power_on: enable = 0
PM: suspend of devices complete after 86.762 msecs
PM: late suspend of devices complete after 0.746 msecs
PM: noirq suspend of devices complete after 0.958 msecs
Disabling non-boot CPUs ...
CPU2: shutdown
CPU3: shutdown +-----------------------------+
rkpm_enter: | |
Resume caused by IRQ 68 |Cannot open /dev/ttyUSB0!|
Suspended for 0.000 seconds | |
Enabling non-boot CPUs ... +-----------------------------+
CPU2: Booted secondary processor
CPU2 is up
CPU3: Booted secondary processor
CPU3 is up
PM: noirq resume of devices complete after 0.420 msecs
PM: early resume of devices complete after 1.026 msecs
phy_power_on: enable = 1
mmc_host mmc0: Bus speed (slot 0) = 100000000Hz (slot req 50000000Hz, actual 50000000HZ div = 1)
rk_sdmmc: BOOT dw_mci_setup_bus: argue clk_mmc workaround out normal clock
1358..dw_mci_set_ios:no card.
mmc_host mmc2: Bus speed (slot 0) = 37500000Hz (slot req 37500000Hz, actual 37500000HZ div = 0)
rk_sdmmc: BOOT dw_mci_setup_bus: argue clk_mmc workaround out normal clock
dwc_otg_hcd_resume, usb device mode
: Enter rfkill_wlan_resume
battery resume c=0 v=4200 ev=4200 rv=0 dt=55 at=110 chg=1
bcmsdh_sdmmc_resume Enter func->num=1
bcmsdh_sdmmc_resume Enter func->num=2
bcmsdh_sdmmc_resume Exit
PM: resume of devices complete after 123.879 msecs
cpufreq: cpufreq_resume: Failed to start governor for policy: c58dc540
cpufreq: cpufreq_resume: Failed to start governor for policy: c58dc540
: ** disable irq
Restarting tasks ... dwc_otg_hcd_suspend, usb device mode
done.
dwmmc_rockchip 10214000.rksdmmc: dw_mci_pm_notify:post suspend
PM: suspend exit 2011-01-01 12:11:03.073896666 UTC
PM: suspend entry 2011-01-01 12:11:08.009463669 UTC
PM: Syncing filesystems ... done.
dwmmc_rockchip 10214000.rksdmmc: dw_mci_pm_notify:suspend prepare
Freezing user space processes ... (elapsed 0.002 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Suspending console(s) (use no_console_suspend to debug)
GPIO0_INTEN: 0x10000000
GPIO1_INTEN: 0x00020200
GPIO3_INTEN: 0x00c00000
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