af9015/tda18218: Multiples (separates) usb devices errors/conflicts

af9015/tda18218: Multiples (separates) usb devices errors/conflicts

[Jin Kazama]

Hello,
	I've been testing af9015/tda18218 based usb DVB-T tuners on a 2.6.39.4 
kernel with the latest v4l drivers avaiable (from git).
	When I'm using a single USB module, (listed as /dev/dvb/adapter0), 
everything works fine.
	When I'm plugging another module, at first it looks like everything's 
ok (/dev/dvb/adapter1) and if I try to use this module while the 
adapter0 is not been used, it works - but if try to use both modules at 
the same time, I get garbage output on both cards (error: warning: 
discontinuity for PID... with dvblast on both cards.
	Does anyone have any idea on how to fix this problem?

Re: af9015/tda18218: Multiples (separates) usb devices errors/conflicts

[Antti Palosaari]

On 09/24/2011 12:06 AM, Jin Kazama wrote:
> Hello,
> I've been testing af9015/tda18218 based usb DVB-T tuners on a 2.6.39.4
> kernel with the latest v4l drivers avaiable (from git).
> When I'm using a single USB module, (listed as /dev/dvb/adapter0),
> everything works fine.
> When I'm plugging another module, at first it looks like everything's ok
> (/dev/dvb/adapter1) and if I try to use this module while the adapter0
> is not been used, it works - but if try to use both modules at the same
> time, I get garbage output on both cards (error: warning: discontinuity
> for PID... with dvblast on both cards.
> Does anyone have any idea on how to fix this problem?

Feel free to fix it. I am too busy currently.

Antti


-- 
http://palosaari.fi/

Re: af9015/tda18218: Multiples (separates) usb devices errors/conflicts

[Jin Kazama]

On 9/24/11 12:06 AM, Antti Palosaari wrote:
> On 09/24/2011 12:06 AM, Jin Kazama wrote:
>> Hello,
>> I've been testing af9015/tda18218 based usb DVB-T tuners on a 2.6.39.4
>> kernel with the latest v4l drivers avaiable (from git).
>> When I'm using a single USB module, (listed as /dev/dvb/adapter0),
>> everything works fine.
>> When I'm plugging another module, at first it looks like everything's ok
>> (/dev/dvb/adapter1) and if I try to use this module while the adapter0
>> is not been used, it works - but if try to use both modules at the same
>> time, I get garbage output on both cards (error: warning: discontinuity
>> for PID... with dvblast on both cards.
>> Does anyone have any idea on how to fix this problem?
>
> Feel free to fix it. I am too busy currently.
>
Well, it looks like if I put 2 devices on different USB buses (on the 
same machine), they work fine, but if they're on the same USB bus, I get 
the problem...
I think the driver may get raw data from the USB bus - and the way it 
identifies the device is not the proper way (I have 2 exactly identical 
devices) => when both devices send data, the driver catches all the data 
from the bus, which is a corrupt mix of both streams...)
Unfortunately, I don't think that I'm capable of fixing the problem by 
myself, I don't even know which part of the driver to look for... if 
someone can give me a hint, I might *try* to *attempt* to fix it :)...

Re: af9015/tda18218: Multiples (separates) usb devices errors/conflicts

[Josu Lazkano]

2011/9/24 Jin Kazama <jin.ml@skynet.fr>:
> On 9/24/11 12:06 AM, Antti Palosaari wrote:
>>
>> On 09/24/2011 12:06 AM, Jin Kazama wrote:
>>>
>>> Hello,
>>> I've been testing af9015/tda18218 based usb DVB-T tuners on a 2.6.39.4
>>> kernel with the latest v4l drivers avaiable (from git).
>>> When I'm using a single USB module, (listed as /dev/dvb/adapter0),
>>> everything works fine.
>>> When I'm plugging another module, at first it looks like everything's ok
>>> (/dev/dvb/adapter1) and if I try to use this module while the adapter0
>>> is not been used, it works - but if try to use both modules at the same
>>> time, I get garbage output on both cards (error: warning: discontinuity
>>> for PID... with dvblast on both cards.
>>> Does anyone have any idea on how to fix this problem?
>>
>> Feel free to fix it. I am too busy currently.
>>
> Well, it looks like if I put 2 devices on different USB buses (on the same
> machine), they work fine, but if they're on the same USB bus, I get the
> problem...
> I think the driver may get raw data from the USB bus - and the way it
> identifies the device is not the proper way (I have 2 exactly identical
> devices) => when both devices send data, the driver catches all the data
> from the bus, which is a corrupt mix of both streams...)
> Unfortunately, I don't think that I'm capable of fixing the problem by
> myself, I don't even know which part of the driver to look for... if someone
> can give me a hint, I might *try* to *attempt* to fix it :)...
> --
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>

Hello, I have similar problem, I have a dual tuner and they don't work together:

# i2cdetect -l
i2c-0	smbus     	SMBus nForce2 adapter at 4d00   	SMBus adapter
i2c-1	i2c       	cx23885[0]                      	I2C adapter
i2c-2	i2c       	cx23885[0]                      	I2C adapter
i2c-3	i2c       	cx23885[0]                      	I2C adapter
i2c-4	i2c       	NVIDIA i2c adapter 0 at 3:00.0  	I2C adapter
i2c-5	i2c       	NVIDIA i2c adapter 2 at 3:00.0  	I2C adapter
i2c-6	i2c       	NVIDIA i2c adapter 3 at 3:00.0  	I2C adapter
i2c-7	i2c       	KWorld PlusTV Dual DVB-T Stick (DVB-T 399U)	I2C adapter
i2c-8	i2c       	KWorld PlusTV Dual DVB-T Stick (DVB-T 399U)	I2C adapter

I can not change the USB bus, because they are on the same physical
device.I have no idea how to fix it but I am ready to test all fixes.
I read some Antti posts on how to is designed the af9015 dual demod:

http://www.mail-archive.com/linux-media@vger.kernel.org/msg36821.html
http://palosaari.fi/linux/v4l-dvb/controlling_tuner_af9015_dual_demod.txt

Is there any tool to check the i2c errors?

Thanks for all your work and best regards.

-- 
Josu Lazkano