linux-kernel - Re: [PATCH] usb: dwc2: Fix HiKey regression caused by power

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Date:   Tue, 22 May 2018 14:24:47 +0000
From:   Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
To:     John Stultz <john.stultz@...aro.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>
CC:     lkml <linux-kernel@...r.kernel.org>,
        John Youn <John.Youn@...opsys.com>,
        Vardan Mikayelyan <mvardan@...opsys.com>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>,
        Grigor Tovmasyan <Grigor.Tovmasyan@...opsys.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] usb: dwc2: Fix HiKey regression caused by power_down
 feature

Hi John,

Please provide log with debug enabled configuration.

On 5/21/2018 11:41 PM, John Stultz wrote:
> On Mon, May 21, 2018 at 1:45 AM, Minas Harutyunyan
> <Minas.Harutyunyan@...opsys.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:
OTG port you mean MicroAB, Correct?
dwc2 driver loaded when some device connected to OTG port?
And below message printed after disconnect the device from OTG port?

>>> [   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.
USB-host ports - you mean 2 USB A-ports, connected to TS3USB221 HUB?
Switching ports between OTG and Host ports via TS3USB221 Switch 
performing automatically or by some SW tool?

>>>
>>> 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
>