[U-Boot] usb: Fail to get descriptor for USB 2.0 device

[Bin Meng]

Hi,

On Thu, May 24, 2018 at 4:51 AM, DATACOM - Paulo.Zaneti
<paulo.zaneti at datacom.com.br> wrote:
>
>
> On 23/05/2018 15:00, Marek Vasut wrote:
>>
>> On 05/23/2018 07:52 PM, DATACOM - Paulo.Zaneti wrote:
>>>
>>>
>>> On 23/05/2018 14:43, Marek Vasut wrote:
>>>>
>>>> On 05/23/2018 07:37 PM, DATACOM - Paulo.Zaneti wrote:
>>>>>
>>>>> On 23/05/2018 14:03, Marek Vasut wrote:
>>>>>>
>>>>>> On 05/23/2018 07:00 PM, DATACOM - Paulo.Zaneti wrote:
>>>>>>>
>>>>>>> Hi,
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>>> When trying to migrate a board from u-boot version 2016.09 to version
>>>>>>> 2018.03, I found a problem with a USB 2.0 device which used to work
>>>>>>> on
>>>>>>> version 2016.09.
>>>>>>
>>>>>> Does it still happen in u-boot/master ?
>>>>>
>>>>> Yes, it still happens.
>>>>>
>>>>> I just tested it with the following commit:
>>>>> dca268a .travis.yml: Further optimizations
>>>>>>>
>>>>>>> In u-boot version 2016.09 the device appears like this:
>>>>>>>
>>>>>>> 2: Mass Storage,  USB Revision 2.0
>>>>>>>     - SanDisk Cruzer Blade 200443243002FB509E64
>>>>
>>>> Let me guess, is this a DWC2-based host ? You didn't mention which SoC
>>>> or USB controller it is.
>>>>
>>>> Cfr https://lists.denx.de/pipermail/u-boot/2016-January/240090.html ,
>>>> DWC2 has problems with those sandisk sticks.
>>>
>>> No, it is a NXP T1024 SoC.
>>> Do you think it may be a problem with the SoC or NXP USB host driver ?
>>>
>> So that's chipidea ? That one should be reasonably sane.
>
> I don't think so. It uses following drivers:
>   drivers/usb/host/ehci-fsl.c
>   drivers/usb/host/ehci-hcd.c
>
>>
>> Submit the patch you had in mind and let's see what happens.
>
> I just noticed that this stick needs more time after the usb_set_address()
> call.
> I increased the mdelay(10) to mdelay(20) and the "usb start" command worked.
> But the problem is that I am still not convinced that this should be the
> solution.
>

Agreed. Can you bisect to see which commit broke your stick?

Regards,
Bin