[linux-dvb] Re: Frontend experimental patch v1

[Johannes Stezenbach <js@convergence.de>]

On Tue, Mar 09, 2004 at 03:20:35AM +0100, Oliver Endriss wrote:
> On Tuesday 09 March 2004 02:54, Andrew de Quincey wrote:
> > 
> > IMO, that should be done in userspace... when the apps are first scanning for 
> > TV signals they should use AUTO.. when they get a lock, they should record 
> > them and use the non-AUTO values.
> 
> Nack. Afaik there are some cards around, which require a different
> inversion setting than others. So the application had to store that
> inversion setting for each card. That's bad [tm].

Nope. It's sufficient to have one flag per card which
means "this card is different that the others" ;-)

> So the application should not care about inversion at all.
> If the the driver tries the last working inversion setting first, there
> should be no performance problem with INVERSION_AUTO.

I still think that explicit inversion setting is a useful optimization.

> > The frontend core only does autoinversion if the app requests it in 
> > SET_FRONTEND with INVERSION_AUTO... I think is how the API is supposed to 
> > work anyway.
> 
> Imho the inversion stuff should be completely removed from the API.

No way!

> Anyway, when using INVERSION_AUTO, the driver is free to use the last
> working inversion setting. It will speed-up tuning.

ACK

Johannes


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