linux-kernel - Re: [PATCH] usb: dwc3: Fix the USB 3.0 hub detection bug after warm boot

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Date:   Sun, 30 Jul 2017 07:53:03 +0800
From:   gustavo panizzo <gfa@...bi.com.ar>
To:     Felipe Balbi <balbi@...nel.org>
Cc:     Baolin Wang <baolin.wang@...aro.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
        Brian Kim <brian.kim@...dkernel.com>
Subject: Re: [PATCH] usb: dwc3: Fix the USB 3.0 hub detection bug after warm
 boot

Hi

On Mon, Jul 24, 2017 at 12:53:27PM +0300, Felipe Balbi wrote:
>
>Hi,
>
>gustavo panizzo <gfa@...bi.com.ar> writes:
>>>> On Wed, Jul 12, 2017 at 02:08:04PM +0800, Baolin Wang wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> On 12 July 2017 at 11:52, gustavo panizzo <gfa@...bi.com.ar> wrote:
>>>>>>
>>>>>> The dwc3 could not release resources when the module is built-in
>>>>>> because this module does not have shutdown method. This causes the USB
>>>>>> 3.0 hub is not able to detect after warm boot.
>>>>>>
>>>>>> Original patch by Brian Kim, updated and submitted upstream by gustavo
>>>>>> panizzo.
>>>>>>
>>>>>> Also see https://bugs.debian.org/843448
>>>>>>
>>>>>> Signed-off-by: Brian Kim <brian.kim@...dkernel.com>
>>>>>> Signed-off-by: gustavo panizzo <gfa@...bi.com.ar>
>>>>>> ---
>>>>>>  drivers/usb/dwc3/core.c | 33 +++++++++++++++++++++++++++++++++
>>>>>>  1 file changed, 33 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>>>>>> index 326b302fc440..f92dfe213d89 100644
>>>>>> --- a/drivers/usb/dwc3/core.c
>>>>>> +++ b/drivers/usb/dwc3/core.c
>>>>>> @@ -1259,6 +1259,38 @@ static int dwc3_probe(struct platform_device
>>>>>> *pdev)
>>>>>>         return ret;
>>>>>>  }
>>>>>>
>>>>>> +static void dwc3_shutdown(struct platform_device *pdev)
>>>>>> +{
>>>>>> +       struct dwc3     *dwc = platform_get_drvdata(pdev);
>>>>>> +       struct resource *res = platform_get_resource(pdev,
>>>>>> IORESOURCE_MEM, 0);
>>>>>> +
>>>>>> +       pm_runtime_get_sync(&pdev->dev);
>>>>>> +       /*
>>>>>> +        * restore res->start back to its original value so that, in case
>>>>>> the
>>>>>> +        * probe is deferred, we don't end up getting error in request
>>>>>> the
>>>>>> +        * memory region the next time probe is called.
>>>>>> +        */
>>>>>> +       res->start -= DWC3_GLOBALS_REGS_START;
>>>>>> +
>>>>>> +       dwc3_debugfs_exit(dwc);
>>>>>> +       dwc3_core_exit_mode(dwc);
>>>>>> +       dwc3_event_buffers_cleanup(dwc);
>>>>
>>>>
>>>> What about dwc3_event_buffers_cleanup? should I remove it from
>>>> dwc3_shutdown()?
>>>> It is already in dwc3_core_exit()
>>>
>>>I think so. We should avoid duplicate code.
>>>
>>>>>> +       dwc3_free_event_buffers(dwc);
>>>>>> +
>>>>>> +       usb_phy_set_suspend(dwc->usb2_phy, 1);
>>>>>> +       usb_phy_set_suspend(dwc->usb3_phy, 1);
>>>>>> +
>>>>>> +       phy_power_off(dwc->usb2_generic_phy);
>>>>>> +       phy_power_off(dwc->usb3_generic_phy);
>>>>>
>>>>>
>>>>> We've done these in dwc3_core_exit().
>>
>> This is the patch after testing on a Odroid XU4, on top of linux-next
>> 964bcc1b4f57028d56dace7d9bc5924f2eb43f36 which translates to 4.13.0-rc1-next-20170717+
>> I tested this patch for a week without problems with heavy USB and NIC usage.
>> Please consider merging it
>>
>>
>> Author: gustavo panizzo <gfa@...bi.com.ar>
>> Date:   Wed Jul 12 11:26:55 2017 +0800
>>
>>     usb: dwc3: Fix the USB 3.0 hub detection bug after warm boot
>>
>>     The dwc3 could not release resources when the module is built-in
>>     because this module does not have shutdown method. This causes the USB
>>     3.0 hub is not able to detect after warm boot.
>>
>>     Original patch by Brian Kim, updated and submitted upstream by gustavo
>>     panizzo.
>
>if the original patch is from Brian, then 'Author' should be
>Brian. Please fix it.
sure, i just didn't want to attribute something he didn't write

>
>I also don't get why all of a sudden we need to implement
>->shutdown(). Why is it that we never needed it before and we need it now?
Commit c499ff71ff2a281366c6ec7a904c547d806cbcd1 broke USB3 for the
Odroid XU4, this 2 patches fix the USB3

https://github.com/hardkernel/linux/commit/74b9605e5587b30912d6b6093e9d7fb06d043c33
https://github.com/hardkernel/linux/commit/2166ffd004e04a61887eb2a39f8639dc12140c58

Hardkernel didn't upstreamed them, after investigation in Debian #843448
the 2 patches were identified.

The first patch is being upstreamed by Jochen Sprickerhof
http://marc.info/?l=linux-usb&m=149945465112440&w=2

I'm taking care of the second patch

>
>Care to bisect to find the first commit which started causing this
>problem?

c499ff71ff2a281366c6ec7a904c547d806cbcd1

>
>-- 
>balbi



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