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Message-ID: <CALAqxLVZXs97sryfPaGY5Gq50-FZROgaBADNXXadcyiNhP3EPQ@mail.gmail.com>
Date: Mon, 21 May 2018 12:40:50 -0700
From: John Stultz <john.stultz@...aro.org>
To: 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
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:
>> [ 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
Download attachment "dmesg.log" of type "application/octet-stream" (80040 bytes)
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