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

[wens Tsai]

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 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.

ChenYu