Re: Linux 4.2.0-rc5: am335x: musb warnings

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On Wed, Apr 6, 2016 at 5:02 PM, Bin Liu <b-liu@xxxxxx> wrote:
> On Wed, Apr 06, 2016 at 03:35:41PM +0200, Yegor Yefremov wrote:
>> On Wed, Apr 6, 2016 at 3:26 PM, Bin Liu <b-liu@xxxxxx> wrote:
>> > On Wed, Apr 06, 2016 at 03:17:48PM +0200, Yegor Yefremov wrote:
>> >> On Wed, Apr 6, 2016 at 3:09 PM, Bin Liu <b-liu@xxxxxx> wrote:
>> >> > On Wed, Apr 06, 2016 at 11:53:26AM +0200, Yegor Yefremov wrote:
>> >> >> > Thanks for the tip. Yes, mmcli can aleays find the SIM card.
>> >> >>
>> >> >> I've got SIM7100E card working with ModemManager. It also provokes the
>> >> >> same tx fifo error, but wwan0 is working afterwards. At least I could
>> >> >> make a connection, get IP address over DHCP and ping an URL.
>> >> >>
>> >> >> mmcli -m 0 --simple-connect="apn=internet.eplus.de"
>> >> >
>> >> > So this tx fifo flush warning can be ignored, right?
>> >>
>> >> This is difficult to say. Could you make a connection with MA260? And
>> >> I must also make a test with HackRF hardware. I'll let you know, as
>> >> soon as I've tested it.
>> >>
>> >> Do you have an idea, how one can fix this nevertheless?
>> >
>> > No. As Felipe mentioned in this thread earlier, we don't get much help
>> > from the MUSB document. Unless this issue caused any functional problem,
>> > I wouldn't spend more time on it.
>>
>> What should we do with the warning message? It will make users worry
>> about the system.
>
> We decided to use WARN() until we have enuogh data to conclude the flush
> error does not break any function. But we are not there yet.
>
>>
>> Could you then look at the freeze issue with removing FTDI device
>> during it is working?
>
> I can. I will have to first locate a FT4243H device.

Insert MA260 and execute following command:

cat /dev/zero > /dev/ttyUSB2

then remove MA260 - system freezes.
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