On Tue, Nov 28, 2017 at 01:09:45PM -0500, Alan Stern wrote: > The EHCI debugging files require CONFIG_DYNAMIC_DEBUG to be enabled. > Oddly enough, the OHCI debugging files do not have the same > requirement. I don't know the reason for this difference. I see, thanks for suggestion. USB cable unplugged: $ cat /sys/kernel/debug/usb/ehci/48064800.ehci/registers bus platform, device 48064800.ehci EHCI Host Controller EHCI 1.00, rh state running structural params 0x00001313 capability params 0x00000016 status 0000 command 0010005 (park)=0 ithresh=1 period=512 RUN intrenable 37 IAA FATAL PCD ERR INT uframe 0000 port:1 status 001000 0 ACK POWER sig=se0 port:2 status 001000 0 ACK POWER sig=se0 port:3 status 001000 0 ACK POWER sig=se0 irq normal 0 err 0 iaa 0 (lost 0) complete 0 unlink 0 Plugged: $ cat /sys/kernel/debug/usb/ehci/48064800.ehci/registers bus platform, device 48064800.ehci EHCI Host Controller EHCI 1.00, rh state running structural params 0x00001313 capability params 0x00000016 status 0000 command 0010005 (park)=0 ithresh=1 period=512 RUN intrenable 37 IAA FATAL PCD ERR INT uframe 0000 port:1 status 001000 0 ACK POWER sig=se0 port:2 status 001000 0 ACK POWER sig=se0 port:3 status 001000 0 ACK POWER sig=se0 irq normal 0 err 0 iaa 0 (lost 0) complete 0 unlink 0 $ lsusb -t /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ehci-omap/3p, 480M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=musb-hdrc/1p, 480M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ohci-platform/3p, 12M ladis -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
