On Friday 30 September 2011, Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx> wrote:
> Em 28-09-2011 09:50, Simon Farnsworth escreveu:
> > (note - the CC list is everyone over 50% certainty from get_maintainer.pl)
> >
> > I'm having problems getting a Hauppauge HVR-1110 card to successfully
> > tune PAL-D at 85.250 MHz vision frequency; by experimentation, I've
> > determined that the tda18271 is tuning to a frequency 1.25 MHz lower
> > than the vision frequency I've requested, so the following workaround
> > "fixes" it for me.
> >
> > diff --git a/drivers/media/common/tuners/tda18271-fe.c
> > b/drivers/media/common/tuners/tda18271-fe.c
> > index 63cc400..1a94e1a 100644
> > --- a/drivers/media/common/tuners/tda18271-fe.c
> > +++ b/drivers/media/common/tuners/tda18271-fe.c
> > @@ -1031,6 +1031,7 @@ static int tda18271_set_analog_params(struct
> > dvb_frontend *fe,
> > mode = "I";
> > } else if (params->std & V4L2_STD_DK) {
> > map = &std_map->atv_dk;
> > + freq += 1250000;
> > mode = "DK";
> > } else if (params->std & V4L2_STD_SECAM_L) {
> > map = &std_map->atv_l;
>
> If I am to fix this bug, instead of a hack like that, it seems to be better
> to split the .atv_dk line at the struct tda18271_std_map maps on
> drivers/media/common/tuners/tda18271-maps.c.
>
> Looking at the datasheet, on page 43, available at:
> http://www.nxp.com/documents/data_sheet/TDA18271HD.pdf
>
> The offset values for IF seem ok, but maybe your device is using some variant
> of this chip that requires a different maps table.
>
How would I identify this? I definitely need the hack on multiple different
HVR1110 cards, in different motherboards. I get apparently perfect reception
if I apply the hack, so clearly something is wrong.
--
Simon Farnsworth
Software Engineer
ONELAN Limited
http://www.onelan.com/
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