On Mon, May 21, 2018 at 1:45 AM, Minas Harutyunyan
<Minas.Harutyunyan@synopsys.com> wrote:
> Hi John,
>
> On 5/19/2018 4:49 AM, John Stultz wrote:
>> In 4.17-rc, commit 03ea6d6e9e1f ("usb: dwc2: Enable power down")
>> caused the HiKey board to not correctly handle switching between
>> usb-gadget and usb-host mode.
>>
>> Unplugging the OTG port would result in:
>> [   42.240973] dwc2 f72c0000.usb: dwc2_restore_host_registers: no host registers to restore
>> [   42.249066] dwc2 f72c0000.usb: dwc2_host_exit_hibernation: failed to restore host registers
>>
>> And the USB-host ports would not function.
>>
>> And plugging in the OTG port, we would see:
>> [   46.046557] WARNING: CPU: 3 PID: 6 at drivers/usb/dwc2/gadget.c:260 dwc2_hsotg_init_fifo+0x194/0x1a0
>> [   46.055761] CPU: 3 PID: 6 Comm: kworker/u16:0 Not tainted 4.17.0-rc5-00030-ge67da8c #231
>> [   46.055767] Hardware name: HiKey Development Board (DT)
>> [   46.055784] Workqueue: dwc2 dwc2_conn_id_status_change
>> ...
>>
> Could you please send full log to debug.

Full dmesg log attached.

I unplugged the usb-otg port at 136
and replugged it back in at 141


>>       p->uframe_sched = false;
>>       p->change_speed_quirk = true;
>> +     p->power_down = false;
>
> power_down declared as int, suggested to update as follow:
>         p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
>
> This can be accepted as temporary solution until we will fully debug
> hibernation feature for HiKey platform.

Ok, will re-send with the suggested change above.

thanks
-john