[OpenWrt-Devel] [PATCH] uqmi: add timeout parameter

[Zefir Kurtisi]

On 11/16/19 3:59 PM, Piotr Dymacz wrote:
> Hi Zefir,
> 
> On 07.11.2019 12:54, Zefir Kurtisi wrote:
>> Working with Quectel EM12 LTE-module, we observe
>> regular stalls of the QMI interface which cause
>> a request issued by uqmi to hang forever.
>>
>> Most reproducibly this happens after the device
>> has been power-cycled and left untouched for a
>> while (~ 60s+). Most of the time the very first
>> QMI request fails, since it is not responded by
>> the module. This is the strace from such a run
>> (from --get-pin-status):
>>
>>   open("/dev/cdc-wdm0", O_RDWR|O_EXCL|O_NOCTTY|O_NONBLOCK|O_LARGEFILE) = 6
>>   fcntl64(6, F_GETFL)                     = 0x10802 (flags
>> O_RDWR|O_NONBLOCK|O_LARGEFILE)
>>   fcntl64(6, F_SETFL, O_RDWR|O_NONBLOCK|O_LARGEFILE) = 0
>>   epoll_ctl(3, EPOLL_CTL_ADD, 6, {EPOLLIN|EPOLLRDHUP|EPOLLET, {u32=268567076,
>> u64=1153486808202346496}}) = 0
>>   write(6, "\1\17\0\0\0\0\0\1\"\0\4\0\1\1\0\2", 16) = 16
>>   clock_gettime(CLOCK_MONOTONIC, {tv_sec=95, tv_nsec=583444789}) = 0
>>   clock_gettime(CLOCK_MONOTONIC, {tv_sec=95, tv_nsec=583770264}) = 0
>>   epoll_pwait(3,
>>   [ hang forever ]
>>
>> After killing the blocked uqmi process, the next
>> request works as expected.
>>
>> We don't know whether this is a device FW issue
>> (we use the latest EM12GPAR01A15M4G) or whether
>> the device enters some undocumented power-save
>> mode after idling for some time.
> 
> Could you share this firmware version, is that a generic Quectel or a customized
> one? I would like to reproduce and debug the problem but the EM12 I have here has
> 'EM12GPAR01A_11_M4G'.
> 
> Also, what platform do you use this modem with?
> 

Hi Piotr,

we use our own products [1], which are built around a PowerPC (8540) based platform.

The FW we received from Codico [2], Quectel's distributor and support proxy for
Switzerland. We get preview versions on request, therefore I am not sure if it can
be posted publicly. I'll check for restrictions and provide the FW if able.


Cheers


[1] https://www.neratec.com/products
[2] https://www.codico.com/

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