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AM437x USB0的问题

你好, 我想咨询一下AM437X上的USB0休眠唤醒的问题。

AM437x,有两个usb接口,我用的是usb0接4G模块。现在的问题是系统唤醒起来后,usb0上的设备感觉像是复位了一次一样。

其实就想问下下面log的红色字体的出现是否正常?如果我接的是u盘,是否会将u盘断开一次再重新挂载?

LOG:

 9008.422315] PM: Syncing filesystems … done.
[ 9008.428362] Freezing user space processes … (elapsed 0.001 seconds) done.
[ 9008.437807] Freezing remaining freezable tasks … (elapsed 0.001 seconds) done.
[ 9008.454342] PM: suspend of devices complete after 6.479 msecs
[ 9008.462624] PM: late suspend of devices complete after 2.460 msecs
[ 9008.471767] PM: noirq suspend of devices complete after 2.894 msecs
[ 9008.478148] PM: Successfully put all powerdomains to target state
[ 9008.496823] PM: noirq resume of devices complete after 18.576 msecs
[ 9008.506372] PM: early resume of devices complete after 2.667 msecs
[ 9008.576832] usb usb1: root hub lost power or was reset
[ 9008.582028] usb usb2: root hub lost power or was reset
[ 9008.932746] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
[ 9009.104320] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 9009.112912] option 1-1:2.2: device disconnected
[ 9009.118142] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 9009.126414] option 1-1:2.3: device disconnected
[ 9009.131536] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 9009.139786] option 1-1:2.4: device disconnected
[ 9009.144969] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[ 9009.153206] option 1-1:2.5: device disconnected
[ 9009.158298] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
[ 9009.166527] option 1-1:2.6: device disconnected
[ 9009.171943] PM: resume of devices complete after 659.259 msecs
[ 9009.180091] option 1-1:2.2: GSM modem (1-port) converter detected
[ 9009.187029] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 9009.194280] option 1-1:2.3: GSM modem (1-port) converter detected
[ 9009.200785] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[ 9009.207836] option 1-1:2.4: GSM modem (1-port) converter detected
[ 9009.214344] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
[ 9009.221334] option 1-1:2.5: GSM modem (1-port) converter detected
[ 9009.227846] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4
[ 9009.234864] option 1-1:2.6: GSM modem (1-port) converter detected
[ 9009.241366] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB5

望不吝赐教,谢谢!!!

Jian Zhou:

感觉是休眠的时候,USB_VBUS掉电了。

唤醒之后USB 4G模块工作正常么?

luo luo3:

回复 Jian Zhou:

休眠起来后,原拨号后台程序中断了。需要拨号,才能正常工作,而且设备节点也改变了,如ttyUSB0节点没了,变成了ttyUSB1。

如果USB_VBUS掉电了,这个问题有的解决么?

谢谢!

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