[linux-dvb] Re: My DVB-c patch (Re: The drivers and HTV)

[Holger Waechtler <holger@convergence.de>]

Jaakko Hyvätti wrote:
> On Thu, 6 Mar 2003, Holger Waechtler wrote:
>
> > can somebody of you please extract the relevant part of this patch?
> >
> > It's ways too big and does ways too many things at once to get applied
> > to the CVS repository.
>
>   Yes, it's time to get this cleaned up.  The patch below includes the
> essentials.  I have not received complaints of my patch not working,
> but who knows, there might be someone with a card that needs the current
> CVS version and does not work with the patch.  We just cannot know until
> we break them, do we?
>
>   Some points:
>
> - Disables zigzag for everything except DVB-s.  This is from Metzler
>   driver.  Maybe someone with DVB-t needs it?  In that case change the
>   "!= FE_QPSK" to "== FE_QAM".
> - The IF of 35937500 might be better to be 36000000.  This might be
>   what the card designer meant.  My card shows the AFC fine tuning
>   offset to be closest to zero with 35937500 (one step below 36MHz).
>   Some other cards might be different.  I have not heard of any complaints
>   about my patch not working for someone in this respect.
I had the feeling that this offset changed from PLL to PLL. Unfortunally 
the VES1820 was used in connection with different PLLs.

> - Has anyone ever tested this auto inversion thing?  DVB-c is far too slow
>   to tune and lock for this auto inversion code to work.  Therefore you
>   need to manually set it.
yes, it worked fine. Basically the problem is that some cards and STBs 
using the VES1820 have reverse connected I/Q pins between tuner and 
demod. So if we want to use the same channel lists for both we need to 
implement this auto inversion...


> - QAM registers have been tweaked to non-specification values.  I do not
>   know if someone has counterexamples, but this works for a lot of people.
ok, we'll try this.

Holger



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