Hi, I am trying to support suspend to disk(hibernate) on Hikey with 4.4 kernel. During suspend, I could see the usb devices getting reset and I can access them properly. Message can be seen as below: usb 1-1: reset high-speed USB device number 2 using dwc2 usb 1-1.2: reset high-speed USB device number 3 using dwc2 usb 1-1.2.4: reset high-speed USB device number 4 using dwc2 But after resume, usb gets disconnected and I could not access it anymore: usb 1-1: USB disconnect, device number 2 usb 1-1.2: USB disconnect, device number 3 usb 1-1.2.4: USB disconnect, device number 4 However "dwc2 f72c0000.usb" gets setup properly. I guess it is OTG. I have connected only keyboard to USB Type-A. OTG is not connected. I have changed the hibernation default value to 1 in "drivers/usb/dwc2/platform.c" in params_hi6220 since hibernation by default is disabled, but still the issue exists. Is the dwc2_suspend() and dwc2_resume() functions support only suspend to mem? Is there any hack such that we can forcefully reset the USB(dwc2) on resume in dwc2_resume() code path. I tried adding usb_reset_device() to dwc2_resume() path but that gave a panic as expected. I tried to skip suspend in dwc2_suspend(), but still the usb disconnects. I added "dwc2_lowlevel_hw_init" to resume path just to check but still no use. Is the power to hub lost or clock is not set properly or something because I could not understand what is the problem. Below is some more dmesg log: ivid@ivid:~# dmesg | grep usb [ 0.408019] usbcore: registered new interface driver usbfs [ 0.408099] usbcore: registered new interface driver hub [ 0.408224] usbcore: registered new device driver usb [ 0.486321] usbcore: registered new interface driver asix [ 0.486403] usbcore: registered new interface driver ax88179_178a [ 0.486583] dwc2 f72c0000.usb: Configuration mismatch. Forcing host mode [ 0.487491] usbcore: registered new interface driver usb-storage [ 0.581006] usbcore: registered new interface driver usbhid [ 0.581052] usbhid: USB HID core driver [ 2.054331] dwc2 f72c0000.usb: Configuration mismatch. Forcing host mode [ 2.059779] f72c0000.usb supply vusb_d not found, using dummy regulator [ 2.065133] f72c0000.usb supply vusb_a not found, using dummy regulator [ 2.939845] dwc2 f72c0000.usb: DWC OTG Controller [ 2.943587] dwc2 f72c0000.usb: new USB bus registered, assigned bus number 1 [ 2.951537] dwc2 f72c0000.usb: irq 37, io mem 0x00000000 [ 3.342725] usb 1-1: new high-speed USB device number 2 using dwc2 Below are some additional debug logs. * During suspend: dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -104 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -2 dwc2 f72c0000.usb: DWC OTG HCD URB Dequeue dwc2 f72c0000.usb: Called usb_hcd_giveback_urb() dwc2 f72c0000.usb: urb->status = -2 * During resume: dwc2 f72c0000.usb: ClearPortFeature USB_PORT_FEAT_ENABLE usb 1-1: USB disconnect, device number 2 done. usb 1-1.2: USB disconnect, device number 3 asix 1-1.2:1.0 eth0: unregister 'asix' usb-f72c0000.usb-1.2, ASIX AX88772 USB 2.0 Ethernet dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x00, ep->hcpriv=ffffffc02ee7d900 dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x00, ep->hcpriv= (null) dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x81, ep->hcpriv=ffffffc02e823f00 dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x82, ep->hcpriv=ffffffc02e827e00 dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x03, ep->hcpriv=ffffffc02eeb7800 dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x00, ep->hcpriv=ffffffc02e827000 dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x00, ep->hcpriv= (null) dwc2 f72c0000.usb: DWC OTG HCD EP DISABLE: bEndpointAddress=0x81, ep->hcpriv=ffffffc02ee7d800 dwc2 f72c0000.usb: SetPortFeature dwc2 f72c0000.usb: SetPortFeature - USB_PORT_FEAT_POWER * I also tried adding "usb: dwc2: Add reset control to dwc2" patch to 4.4 kernel and reset_control_deassert in "_dwc2_hcd_resume", but it results in panic. * I am able to reproduce the same issue in 4.9 kernel too. Any help would be appreciated Thanks, Ivid -- 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
