Hi, I have been looking into USB stuff. In the EHCI driver code I could see the comment that "we only support lpm device connected to root hub yet" in drivers/usb/host/ehci-pci.c line 466 (3.4 kernel - http://lxr.free-electrons.com/source/drivers/usb/host/ehci-pci.c#L466). Is there any reason to not support lpm in devices connected to hub (other than root hub)? Also inside ehci_lpm_check function in drivers/usb/host/ehci-lpm.c (3.4 kernel - http://lxr.free-electrons.com/source/drivers/usb/host/ehci-lpm.c) the USB device is asked to go to LPM mode and there is a wait for 10ms. I guess the LPM transition (L0 to L1 state transition) should take place within some micro seconds then why should we wait for 10ms for ACK? I will greatly appreciate if I could help in someway in solving technical difficulties (if any). Thanks and Regards, Prasanna Kumar T S M -- 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
