[linux-dvb] [PATCH] Fix the min/max frequencies of some DVB-C frontends

e9hack e9hack at googlemail.com
Tue Aug 7 21:24:48 CEST 2007


Oliver Endriss schrieb:
> e9hack wrote:
>> Currently, I'm missing something in the tuner modules (and I didn't ask for it). It isn't possible
>> to wait for getting the pll lock. The tuning function of the TT-C2300 does wait. It isn't possible
>> to switch the time constant of the loop filter after getting the lock. Usually, it is recommended
>> for any pll chips.
> 
> Have a look how I implemented that in the tda10086 driver (search for
> 'has_lock').
> 

The lock of the tuner pll has nothing to do with the lock of the demodulator.

The TT-C2300 uses a very simple pll chip (TDA6405). Usually, it can use the simple pll (dvb-pll.c),
but it must wait for the lock, because the tuning is very slow (50..150ms). I don't see any benefit,
if the tuning code is moved from one file to another new one.

- Hartmut





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