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

e9hack e9hack at googlemail.com
Mon Aug 6 21:51:44 CEST 2007


Michael Krufky schrieb:
> e9hack wrote:
>>
>> I didn't see the ranges from the tuner, because the dvb-c drivers don't use the pll framework. They
>> have very simple tuning functions only. We should use both values. One part may be more restrictive
>> than the other one.
> 
> FYI, I never mentioned "pll framework"

Sorry, for my incorrect wording..

> IMHO, if there is a separate tuner used in conjunction to the demod, it is
> better to factor out the tuner to a separate dvb_frontend style module, rather
> than leaving it hardcoded within the demod driver.  This may result in a benefit
> of removal of duplicated code, in cases where multiple demods are using the same
> tuner.  I don't know if this is the case in your situation, but it is the case
> with many others.

I think, this is the best way.

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.

- Hartmut



More information about the linux-dvb mailing list