On Fri, 19 May 2017, Kai-Heng Feng wrote:
> Hi,
>
> This issue happens on Carrizo AMD laptops, only EHCI is affected, XHCI
> works fine on the same machine.
>
> I can see lots of USB wakeup and resume messages showed every two seconds.
> Plug USB devices to the EHCI port does not change anything.
>
> dmesg with ehci-hcd, ehci-pci and usbcore dynamic debug enabled is attached:
>
> [ 88.556535] ehci-pci 0000:00:13.0: hcd_pci_runtime_resume: 0
> [ 88.556563] usb usb2: usb auto-resume
> [ 88.556588] hub 2-0:1.0: hub_resume
> [ 88.556676] usb usb2-port1: status 0507 change 0000
> [ 88.556794] hub 2-0:1.0: state 7 ports 2 chg 0000 evt 0000
> [ 88.556862] usb 2-1: usb auto-resume
> [ 88.624577] usb 2-1: Waited 0ms for CONNECT
> [ 88.624585] usb 2-1: finish resume
> [ 88.624838] hub 2-1:1.0: hub_resume
> [ 88.624964] usb 2-1-port1: status 0507 change 0000
> [ 88.625085] usb 2-1-port2: status 0107 change 0000
> [ 88.625354] usb 2-1-port4: status 0507 change 0000
> [ 88.625403] hub 2-1:1.0: state 7 ports 4 chg 0000 evt 0000
> [ 88.625605] usb 2-1.1: usb auto-resume
> [ 88.692635] usb 2-1.1: Waited 0ms for CONNECT
> [ 88.692640] usb 2-1.1: finish resume
> [ 90.800874] usb 2-1.1: usb auto-suspend, wakeup 1
> [ 90.820326] hub 2-1:1.0: hub_suspend
> [ 90.823161] usb 2-1: usb auto-suspend, wakeup 1
> [ 90.840362] hub 2-0:1.0: hub_suspend
> [ 90.840399] usb usb2: bus auto-suspend, wakeup 1
> [ 90.860346] ehci-pci 0000:00:13.0: hcd_pci_runtime_suspend: 0
Your log shows that the 2-1.1 device is a USB2.0-CRW card reader, and
it uses the rtsx_usb driver. This driver probes the reader every few
seconds to see whether a card has been inserted (actually, it probes
_twice_: once to see if an SD card is present and once to see if a
MemoryStick card is present). Each probe (or pair of probes) causes a
resume followed by a suspend.
The way to prevent all those resumes and suspends -- if that's what you
want to do -- is to disable autosuspend for the card reader. The best
way to do this depends on your system, but
echo on >/sys/bus/usb/devices/2-1.1/power/control
should work.
Alan Stern
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