[linux-sunxi] sunxi: Endless musb_bus_suspend warnings when booting A23 tablet with OTG

[wens Tsai]

On Wed, Sep 7, 2016 at 6:44 PM, Hans de Goede <hdegoede at redhat.com> wrote:
> Hi,
>
> On 06-09-16 17:31, wens Tsai wrote:
>>
>> On Tue, Sep 6, 2016 at 7:28 PM, Hans de Goede <hdegoede at redhat.com> wrote:
>>>
>>> Hi,
>>>
>>> On 06-09-16 13:02, wens Tsai wrote:
>>>>
>>>>
>>>> Hi Hans,
>>>>
>>>> I've built the latest sunxi-next branches of Linux and U-boot and
>>>> tried it on my Q8 A23 tablet. My tablet has an OTG adapter with a
>>>> USB ethernet adapter connected all the time. Upon booting into
>>>> Linux I get an endless stream of:
>>>>
>>>>     musb_bus_suspend 2586: trying to suspend as a_wait_bcon while active
>>>>
>>>> messages. To get out of this I have to physically remove the OTG
>>>> adapter. Booting without the OTG adapter to begin with also gets
>>>> rid of the problem.
>>>>
>>>> Have you run into this problem? I wonder if we should disable VBUS
>>>> just before leaving U-boot? Now that we support DRIVEVBUS this
>>>> shouldn't be a problem.
>>>
>>>
>>>
>>> I've not seen such a problem. I'm fine with disabling Vbus when
>>> leaving u-boot, that certainly is the safe thing to do anyways.
>>
>>
>> Seems there's no distinction between "USB reset" and leaving
>> U-boot, as you mentioned in your patch removing the "power off"
>> code from the USB drivers. Are you OK with power cycling during
>> USB reset as well?
>
>
> I would prefer not too, but if it is hard to get around that
> I can live with it.

Unfortunately musb USB reset does not work. I tested without my
patch (the one I sent out today). So I think this point is
irrelevant, at least until someone fixes musb.

ChenYu

>>
>>> I guess I'll get a u-boot patch from you if that indeed fixes
>>> things ?
>>
>>
>> Yup. In progress. Though my ethernet adapter is acting up, so I'll
>> need to swap in something else to test it properly.
>
>
> Cool.
>
> Thanks & Regards,
>
> Hans