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

[Holger Waechtler <holger@convergence.de>]

Andreas Oberritter wrote:
> hi,
>
> 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.

> 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 - )


> 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.

> 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.

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

Maybe we can guess the real I/Q pin assignment from the adapter name 
string derived from the vendor ID, but I'm not perfectly sure about this 
and I don't have all the existing cards here to find out who is using 
which configuration.

Holger



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