Re: video from USB DVB-T get damaged after some time (it9135)

[Antti Palosaari <crope@iki.fi>]

On 26.02.2014 17:10, kapetr@mizera.cz wrote:
>
>
> Dne 26.2.2014 14:33, Antti Palosaari napsal(a):
>> Moikka!
>>
>> On 21.02.2014 15:06, kapetr@mizera.cz wrote:
>>> Hello,
>>>
>>> == Antti:
>>>
>>> May I ask, if you have the same one stick?
>>> Does it work without problems ?
>>
>> I don't have just similar stick, but I tested 1-2 sticks having that
>> same chipset. No problems at all.
>>
>>>
>>> == everybody:
>>>
>>> I have final tested it under W-XP SP2 with orig drivers and SW.
>>> It goes into problems after some time too, BUT there is a difference: It
>>> is able to "recover" from it itself and it plays again (for some time).
>>>
>>> As I wrote - it happens quicker and more frequently on TV channels with
>>> lower/worse signal. That is why I thing that tuner will lose "tuned"
>>> status to exact freq.
>>> Would be not possible to solve this (to re-tune) in driver ? It seems,
>>> that in W-XP is something like that in drivers.
>>
>>
>> I am pretty sure problem is RF-tuner. It warms and goes off from
>> frequency a little, which causes signal level drop. As signal goes
>> weaken, from a point of demodulator, it starts getting decoding errors.
>>
>> Retune fixes things for a while as tuner is calibrated each time when
>> tuning is done. If you wait a little longer, demod will lose signal LOCK
>> and retune is issued - as what happens on windows driver too.
>>
>> It is possible to add some early re-tune logic to demod driver, but it
>> does not sound very wise for single problematic device. Also better
>> approach could be to issue tuner calibration on 5 minute intervals or
>> so. I am not sure if calibrating tuner is possible at runtime, but it
>> should be easy to test.
>
> Thats the Problem - I do not know, how to do it without breaking
> recording. Can You give me a Tip ?
> Which command to "recalibrate" ? Tzap breaks it.

Check the function:
it9137_set_params and it913x_init. You have to do a little bit testing 
here. Like set a timer which calls those routines once in 5 min or so.

regards
Antti

>
>>
>> Anyhow, I am not going to waste any time for workaround this strange
>> issue. You are simply only one having it :) Just get new similar stick
>> and hope it works better.
>
> Of course, I understand. Thanks anyway.
>
>>
>>
>> regards
>> Antti
>>
>>
>
> --kapetr
>
>>
>>>
>>>
>>> Regards
>>>
>>> --kapetr
>>>
>>>
>>> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>
>>> Hello,
>>>
>>> it is this one:
>>> http://www.buyincoins.com/item/30948.html
>>>
>>> I shop there often - lowest prices of all China e-shops I have found.
>>> BTW: if you want try the shop - by registry/first buy give my nick
>>> "jipan0" as referrer. You will get 5% off :-)
>>>
>>> --kapetr
>>>
>>>
>>> Dne 10.2.2014 09:34, Antti Palosaari napsal(a):
>>>> Moi!
>>>>
>>>> On 10.02.2014 10:21, kapetr@mizera.cz wrote:
>>>>> Hello,
>>>>>
>>>>> I have test FW version 12.10.04.1
>>>>> (FYI dmesg changes follows)
>>>>>
>>>>> The problem without change.
>>>>>
>>>>> I did want to test the DVB-T stick under Windows XP, but in VirtualBox
>>>>> works the tuner not at all - I get just jerky sound, no video.
>>>>> But there is older driver (12.7.6.11) - but don't thing the problem is
>>>>> there - rather in VBOX.
>>>>> And no free partition to test.
>>>>
>>>>
>>>> OK, thank for the testing anyway.
>>>> I have few different it9135 devices. Could you find some picture of
>>>> yours, I would like to test myself if I had same device.
>>>>
>>>> regards
>>>> Antti
>>>>
>>>>
>>>>
>>>>
>>>>>
>>>>> Regards.
>>>>>
>>>>> kapetr
>>>>>
>>>>>
>>>>> ----------- old from
>>>>> https://raw.github.com/torvalds/linux/master/Documentation/dvb/get_dvb_firmware
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> [   21.546241] usb 1-1.3: dvb_usb_af9035: prechip_version=83
>>>>> chip_version=02 chip_type=9135
>>>>> [   21.546613] usb 1-1.3: dvb_usb_v2: found a 'ITE 9135 Generic' in
>>>>> cold
>>>>> state
>>>>> [   21.563582] usb 1-1.3: dvb_usb_v2: downloading firmware from file
>>>>> 'dvb-usb-it9135-02.fw'
>>>>> [   21.594974] EXT4-fs (sda2): re-mounted. Opts: errors=remount-ro
>>>>> [   21.659449] usb 1-1.3: dvb_usb_af9035: firmware version=3.39.1.0
>>>>> [   21.659456] usb 1-1.3: dvb_usb_v2: found a 'ITE 9135 Generic' in
>>>>> warm
>>>>> state
>>>>> [   21.660358] usb 1-1.3: dvb_usb_v2: will pass the complete MPEG2
>>>>> transport stream to the software demuxer
>>>>> [   21.660375] DVB: registering new adapter (ITE 9135 Generic)
>>>>> [   21.750565] i2c i2c-16: af9033: firmware version: LINK=0.0.0.0
>>>>> OFDM=3.9.1.0
>>>>> [   21.750570] usb 1-1.3: DVB: registering adapter 0 frontend 0
>>>>> (Afatech
>>>>> AF9033 (DVB-T))...
>>>>> [   22.064646] i2c i2c-16: tuner_it913x: ITE Tech IT913X successfully
>>>>> attached
>>>>> [   22.099994] Registered IR keymap rc-it913x-v1
>>>>> [   22.100068] input: ITE 9135 Generic as
>>>>> /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/rc/rc0/input14
>>>>> [   22.100103] rc0: ITE 9135 Generic as
>>>>> /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/rc/rc0
>>>>> [   22.100106] usb 1-1.3: dvb_usb_v2: schedule remote query
>>>>> interval to
>>>>> 500 msecs
>>>>> [   22.100109] usb 1-1.3: dvb_usb_v2: 'ITE 9135 Generic' successfully
>>>>> initialized and connected
>>>>> [   22.100123] usbcore: registered new interface driver dvb_usb_af9035
>>>>>
>>>>> ---------------new from
>>>>> http://palosaari.fi/linux/v4l-dvb/firmware/IT9135/12.10.04.1/IT9135v2_3.42.3.3_3.29.3.3/
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.520617] usb 1-1.3:
>>>>> dvb_usb_af9035: prechip_version=83 chip_version=02 chip_type=9135
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.520988] usb 1-1.3: dvb_usb_v2:
>>>>> found a 'ITE 9135 Generic' in cold state
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.522267] usb 1-1.3: dvb_usb_v2:
>>>>> downloading firmware from file 'dvb-usb-it9135-02.fw'
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.626497] usb 1-1.3:
>>>>> dvb_usb_af9035: firmware version=3.42.3.3
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.626509] usb 1-1.3: dvb_usb_v2:
>>>>> found a 'ITE 9135 Generic' in warm state
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.627381] usb 1-1.3: dvb_usb_v2:
>>>>> will pass the complete MPEG2 transport stream to the software demuxer
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.627405] DVB: registering new
>>>>> adapter (ITE 9135 Generic)
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631208] i2c i2c-16: af9033:
>>>>> firmware version: LINK=0.0.0.0 OFDM=3.29.3.3
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631215] usb 1-1.3: DVB:
>>>>> registering adapter 0 frontend 0 (Afatech AF9033 (DVB-T))...
>>>>> Feb  9 15:00:54 zly-hugo kernel: [12732.631328] i2c i2c-16:
>>>>> tuner_it913x: ITE Tech IT913X successfully attached
>>>>> --------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Dne 9.2.2014 05:57, Antti Palosaari napsal(a):
>>>>>> On 09.02.2014 02:42, Antti Palosaari wrote:
>>>>>>> Moikka!
>>>>>>> I am going to extract new firmware. I dumped init tables out from
>>>>>>> Windows driver version 12.07.06.1. Is there any newer?
>>>>>>>
>>>>>>> regards
>>>>>>> Antti
>>>>>>>
>>>>>>
>>>>>> I extracted firmwares from Windows driver 12.10.04.1. Didn't find
>>>>>> newer
>>>>>> driver...
>>>>>>
>>>>>> http://blog.palosaari.fi/2014/02/linux-it9135-driver-firmwares.html
>>>>>>
>>>>>> regards
>>>>>> Antti
>>>>>>
>>>>
>>>>
>>
>>


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