[linux-dvb] Re: TDA8290/TDA8275 with LNA
nicola_sabbi at fastwebnet.it
Sun Feb 25 14:39:46 CET 2007
Nico Sabbi wrote:
> Hartmut Hackmann wrote:
>> Hi, Nico
>> Nico Sabbi schrieb:
>>> I've just noticed that in your tree there's support for the
>>> pre-amplifier of some Philips cards.
>>> Does the Lifeview Trio already use your new code? Or do I need to add
>>> support for it?
>> I copy this to the mailing lists because i think this is interesting
>> for more people.
>> First: the code went to mainstream yesterday.
>> Then i should give some explaination of what this is about:
>> Many recent cards with the TDA8275a silicon tuner have a preamplifier
>> (LNA) in front of the tuner chip. It is *not* inside the chip, and
>> since it costs some cents, it will not be on all recent cards.
>> This LNA needs to be controlled by the driver. I know about 3 variants
>> how this is done, currently, the driver doesn't detect the variant
>> automatically. So there is a new entry for the board configuration in
>> saa7134-cards.c. Possible values are:
>> .tuner_config = 0, : no LNA present. This is the default
>> .tuner_config = 1, : with LNA. This config is used on the Pinnacle 310i
>> .tuner_config = 2, : with LNA. This is used on the Philips Tiger-S
>> design and probably on most others.
>> .tuner_config = 3, with LNA. The new variant. Not sure who uses this.
>> There is an entry with the same meaning for the tda10046 configuration
>> in saa7134-dvb.c
>> I should add that the configurations 1 and 3 are untested. I am quite
>> sure that 1 is right but not so sure about config 3.
> on a fresly compiled 2.6.20 + a fresh hg pull, after having set
> .tuner_config=2 in lifeview_trio_config I got:
> saa7133/alsa: saa7133 at 0xf3115000 irq 21 registered as card -1
> tda1004x: setting up plls for 48MHz sampling clock
> tda1004x: found firmware revision 29 -- ok
> BUG: unable to handle kernel paging request at virtual address 6b6b6b6b
> printing eip:
same crash without my change; it seems that 2.6.20 and saa7134-dvb
don't get alone at all
"Without a frontend, mplayer is useless" - someone in mplayer-users
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