[linux-dvb] [patch] Add support for different tuning algorithms

Johannes Stezenbach js at linuxtv.org
Tue Nov 15 20:57:25 CET 2005


On Tue, Nov 15, 2005 Andrew de Quincey wrote:
> On Tuesday 15 Nov 2005 18:07, Felix Domke wrote:
> > Andrew de Quincey wrote:
> > > Hi, this patch allows frontends (and the user) to select from one of
> > > several different tuning algorithms. The patch adds four possibilities:
> > > 1) SW - the current dvb-kernel software zigzag code.
> > > 2) HW - the hardware supports zigzagging internally (e.g. DST), so use
> > > that as it will be faster.
> > > 3) ADAPTIVE - frontend-specific code exploiting frontend-specific
> > > features. 4) SIMPLE - just set the frontend once and do nothing else
> > > (e.g. for frequency scanner apps).
> >
> > Though I didn't test this, i strongly agree that we need this. I don't
> > think it should be user selectable, though (except for the "SIMPLE"
> > mode) - either the frontends supports a specific algorithm or not.
> > Otherwise i fear that user applications start to workaround frontend
> > driver bugs by selecting another algorithm...
> 
> Hmm, yeah thats a good point. The userspace API should _really_ just be 
> switchable between "standard" and "scan" mode.
> 
> What constitutes "normal" mode is then up to the innards of the driver. OK, 
> will update the patch to reflect this.

Full ACK.

Johannes



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