[linux-dvb] Re: [PATCH] ves1820 inversion

[Andreas Oberritter <andreas@oberritter.de>]

On Mon, 2003-05-26 at 09:36, Holger Waechtler wrote:
> Andreas Oberritter wrote:
> > i would like to commit this patch at least to dvb-kernel. the software
> > auto inversion hack does not work. so i removed it.
> 
> Please revert it, reason below.

no commit, no revert. :)

> > imho inversion
> > handling should be left to the application. this way it works fine on a
> > nokia dbox2-c. any complaints?
> 
> That's only possible if you know the real I/Q pin assignment. 
> Unfortunally some Hauppauge DVB-C cards have swapped I/Q pins but the 
> Siemens cards not. (don't know who of them is correct, but if I get any 
> of the responsible engineers into my hands I'll kill him - )

kill the one who made it incompatible to the dbox2 :)

> > another issue is, that since i and q are swapped on the pci cable cards,
> > inversion on/off are swapped, too. how about adding a flag for that and
> 
> only on some of the cards.

narf.

> > do something like if ((inv != INVERSION_AUTO) && (flag)) inv = !inv? 
> 
> hmm, I don't know what exactly do you mean, but it should be definitely 
> possible to get the inversion autoprobing working, and at the time I 
> coded this it actually worked. Maybe we have to increase some of the 
> delays or there became something broken in the REG0 initialisation, many 
> people changed a lot in this code last time.

it would be nice, if it can be autoprobed. however, setting it manually
is stable, if you know what you have to set.

> The stv0299 driver is using a similiar approach and everything is 
> working fine there.

maybe because inversion is always the same on satellites?

regards,
andreas



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