Re: rtl28xxu - rtl2832 frontend attach

[poma <pomidorabelisima@gmail.com>]

On 06/27/2012 07:21 AM, Thomas Mair wrote:
> On 26.06.2012 19:17, poma wrote:
>> On 05/28/2012 04:48 PM, Thomas Mair wrote:
>>> On 28.05.2012 08:58, Thomas Mair wrote:
>>>> On 26.05.2012 04:47, poma wrote:
>>>>> On 05/20/2012 11:12 PM, Thomas Mair wrote:
>>>>>> On 20.05.2012 22:08, Antti Palosaari wrote:
>>>>>>> On 20.05.2012 20:04, poma wrote:
>>>>>>>> After hard/cold boot:
>>>>>>>
>>>>>>>> DVB: register adapter0/net0 @ minor: 2 (0x02)
>>>>>>>> rtl2832u_frontend_attach:
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> rtl28xxu_ctrl_msg: failed=-32
>>>>>>>> No compatible tuner found
>>>>>>>
>>>>>>> These errors are coming from tuner probe. As it still goes to probing and did not jump out earlier when gate is opened it means that demod is answering commands but tuner are not.
>>>>>>>
>>>>>>> My guess is that tuner is still on the reset or not powered at all. It is almost 100% sure error is wrong tuner GPIO.
>>>>>>
>>>>>> There is an issue with GPIO, as FC0012 tuner callback will set 
>>>>>> the value of one of the GPIO outputs. However fixing that, will
>>>>>> not resolve the issue. So I need to debug the problem further.
>>>>>>
>>>>> True. Whatever a value is changed - 'rtl2832u_power_ctrl', it brakes
>>>>> even more.
>>>>> Precisely, what breaks a tuner on next soft [re]boot are apps/utils
>>>>> which engage tzap/scan[dvb].
>>>>>
>>>>
>>>> To reproduce the bug it is not necessary to reboot the machine. Simply 
>>>> unload and load of the dvb_usb_rtl28xxu module will lead to the same 
>>>> situation.
>>>>
>>>> I suspect, that when power is turned off, the tuner power is not 
>>>> switched on correctly. The mistake is not related to the OUTPUT_VAL
>>>> registers but probably to the OUTPUT_DIR or OUTPUT_EN registers.
>>>>
>>>> What makes me wonder is if no tuning operation is performed before
>>>> reboot, the driver does work correctly after that, as poma already
>>>> noticed.
>>>>
>>>> I have some spare time today and will investigate the problem further.
>>>>
>>>
>>> I tried a few things regarding the problem today and could find out a 
>>> few more details, but could not resolve the issue.
>>>
>>> The GPIO pin configuration for the devices with the fc0012 (and probably
>>> also with the fc0013) tuner is the following:
>>>
>>> GPIO0: demod power
>>> GPIO3: tuner power? (the realtek driver puts this to 1 and never touches it again)
>>> GPIO4: tuner power? (maybe antenna power?)
>>> GPIO5: tuner reset
>>> GPIO6: UHF/VHF band selection
>>>
>>> All of these GPIOs are configured as output. When the device is plugged in
>>> the tuner is powered up correctly, but I am not able to power it up when
>>> a reboot is performed. What I tried was the following:
>>>
>>> - on rtl28xxu_power_ctrl off:
>>>   - GPIO4 = 1 (off)
>>>   - GPIO5 = 0 
>>>   - GPIO6 = 0 (default state)
>>>
>>> - on rtl28xxu_power_ctrl on:
>>>   - GPIO3 = 1
>>>   - GPIO4 = 0 (on)
>>>   - GPIO5 = 0 
>>>   - GPIO6 = 0 (default state)
>>>
>>> - on rtl2832_frontend_attach:
>>>   - GPIO5 = 1 
>>>   - GPIO5 = 0 
>>>
>>> This sequence should ensure that the tuner is powered on when the frontend
>>> is attached, and a tuner reset is being performed before the tuner is probed.
>>> However this sequence fails the same way as it did before. I tried to add
>>> timeouts to be sure that the tuner is not probed while it is reset but that
>>> did not help either.
>>>
>>> Right now I really don't know where I should look for the solution of
>>> the problem. It seems that the tuner reset does not have any effect on the 
>>> tuner whatsoever.
>>>
>>> Is there anybody who could look at the code, or maybe knows what could be
>>> the cause of the problem? I suspect I am just too blind to see my own mistakes.
>>>
>>> Regards
>>> Thomas
>>>
>>
>> Cheers Thomas, Hans-Frieder, Antti, Mauro!
>> Hans-Frieder, are you having the same issue with fc0011&af9035?
>> Antti, no tricks up your sleeve?
>> Senhor Mauro, is rtl2832 demod going to be merged?
>>
>> regards,
>> poma
>>
> Hi all,
> 
> I will try to solve the issue as soon as I have some spare time. In the meantime I 
> asked Realtek if they knew of any problems with the hardware, and I got a GPIO
> list which might help me to solve the problem.
> 
> Regrads
> Thomas
> 

Nice to know ;)

Cheers,
poma