+ John Stultz. John submitted a patch recently to temporarily fix the issue by disabling the power down feature in Hikey.
https://lkml.org/lkml/2018/5/21/730 John, I have listed some of my findings to this thread which will help debugging the issue. Thanks, Mani On Thu, May 17, 2018 at 04:04:01PM +0530, Manivannan Sadhasivam wrote: > Hi Artur, > > Thanks for the reply! > > On Thu, May 17, 2018 at 09:10:06AM +0000, Artur Petrosyan wrote: > > Hi Mani, > > > > We need some detailed information to perform debugging. > > > > 1. Could you please share the documentation of "96Boards HiKey" board, at > > least dwc core configuration parameters. Or dump of GHWCFG1-4. > > You can find the HiKey documentation here: > https://github.com/96boards/documentation/tree/master/consumer/hikey/hardware-docs > > GHWCFG register dump: > > GHWCFG1 = 0x00000000 > GHWCFG2 = 0x23affc70 > GHWCFG3 = 0x0780d4e8 > GHWCFG4 = 0xfff00060 > > > 2. Could you please share with us full debug log of dwc2 loading and plug > > the USB device. > > Here is the full kernel log from the boot till USB device gets plugged in: > https://pastebin.ubuntu.com/p/3bZwWtk8wD/ > > > 3. From short debug log seen that Host exited from hibernation after USB > > device plugged to the port. Do you mean that enumeration process didn't > > start? If not, could you please dump registers after "dwc2 f72c0000.usb: > > Host hibernation restore complete" > > Yeah, I guess the enumeration process didn't happen at all. Here is the > register dump after plugging the device: > > https://pastebin.ubuntu.com/p/3vxdkFGgp6/ > > > 4. In which mode had the dwc2 been built. In host only mode or DRD mode? > > DWC2 in HiKey is built in Dual Role Device (DRD) mode. > > > 5. And you mention that USB controller's DP/DM out is connected to a switch > > which switches between a USB type C port and a HUB (USB2513B). Is the > > device connected to USB type C port or to HUB (USB2513B) ? Switching > > connection done before dwc2 load or after? > > > > The USB device is connected to one of the ports from HUB and there is one > gpio which is used for switching the USB ports between Type-C and HUB. By > default, this gpio is unused and it pulled low, which means HUB will get > selected before dwc2 gets loaded. > > Hope this information will help debugging the issue. > > Thanks, > Mani > > > Looking forward to your reply. > > > > Regards, > > Artur > > > > > > -----Original Message----- > > From: Manivannan Sadhasivam [mailto:manivannan.sadhasi...@linaro.org] > > Sent: Wednesday, May 16, 2018 17:23 > > To: linux-usb@vger.kernel.org > > Cc: john.y...@synopsys.com; mvar...@synopsys.com; > > arthur.petros...@synopsys.com; grigor.tovmas...@synopsys.com; > > felipe.ba...@linux.intel.com > > Subject: usb: dwc2: Regression on 96Boards Hikey due to enabling power down > > > > Hello, > > > > Commit 03ea6d6e9e1ff1b0222eb723eee5990d3511cc4d introduced the powerdown > > feature in USB DWC2 driver which stops USB from working on 96Boards HiKey > > board. > > > > During bootup, USB host controller goes into hibernation state and when any > > USB device is plugged onto the port, the host finishes executing the GPWRDN > > interrupt handler but still it didn't wake up. > > > > Below is the dmesg log after plugging a device onto USB port: > > > > [ 30.763414] dwc2 f72c0000.usb: dwc2_handle_gpwrdn_intr: > > dwc2_handle_gpwrdwn_intr called gpwrdn= 081411bb > > [ 30.763458] dwc2 f72c0000.usb: dwc2_handle_gpwrdn_intr: GPWRDN_LNSTSCHG > > [ 30.763492] dwc2 f72c0000.usb: dwc2_host_exit_hibernation: called with > > rem_wakeup = 1 reset = 0 > > [ 30.763623] dwc2 f72c0000.usb: dwc2_restore_essential_regs: restoring > > essential regs > > [ 30.763671] dwc2 f72c0000.usb: restore done generated here > > [ 30.976707] dwc2 f72c0000.usb: dwc2_restore_global_registers > > [ 30.976723] dwc2 f72c0000.usb: dwc2_restore_host_registers > > [ 30.976741] dwc2 f72c0000.usb: Host hibernation restore complete > > > > I tried to manually reset the HUB and PHY after plugging in the device but > > that didn't help. > > > > This issue has been detected in kernel 4.17-rc1. > > > > Can anyone shed some light here? Any help would be greatly appreciated! > > > > Note: On this board, the USB controller's DP/DM out is connected to a > > switch which switches between a USB type C port and a HUB (USB2513B). > > > > Thanks, > > Mani -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
