On Mon, 2010-01-04 at 21:27 -0500, Andy Walls wrote:
> On Mon, 2010-01-04 at 15:27 +1100, Robert Lowery wrote:
> > > Mauro,
> > >
> > > I've split the revert2.diff that I sent you previously to fix the tuning
> > > regression on my DViCO Dual Digital 4 (rev 1) into three separate patches
> > > that will hopefully allow you to review more easily.
> > >
> > > The first two patches revert their respective changesets and nothing else,
> > > fixing the issue for me.
> > > 12167:966ce12c444d tuner-xc2028: Fix 7 MHz DVB-T
> > > 11918:e6a8672631a0 tuner-xc2028: Fix offset frequencies for DVB @ 6MHz
> > >
> > > The third patch does what I believe is the obvious equivalent fix to
> > > e6a8672631a0 but without the cleanup that breaks tuning on my card.
> > >
> > > Please review and merge
> > >
> > > Signed-off-by: Robert Lowery <rglow...@exemail.com.au>
> >
> > Mauro,
> >
> > I'm yet to receive a response from you on this clear regression introduced
> > in the 2.6.31 kernel. You attention would be appreciated
> >
> > Thanks
> >
> > -Rob
>
> Robert,
>
> The changes in question (mostly authored by me) are based on
> documentation on what offsets are to be used with the firmware for
> various DVB bandwidths and demodulators. The change was tested by Terry
> on a Leadtek DVR 3100 H Analog/DVB-T card (CX23418, ZL10353, XC3028) and
> some other cards I can't remember, using a DVB-T pattern generator for 7
> and 8 MHz in VHF and UHF, and live DVB-T broadcasts in UHF for 6 MHz.
>
> (Devin,
> Maybe you can double check on the offsets in tuner-xc2028.c with any
> documentation you have available to you?)
>
>
> I haven't been following this thread really at all as the board in the
> subject line was unfamiliar to me, so sorry for any late response or
> dumb questions by me.
>
> May I ask:
>
> 1. what are the exact problem frequencies?
> 2. what is the data source from which you are getting the frequency
> information?
> 3. what does tuner-xc2028 debug logging show as the firmware loaded when
> tune to one of the the problem frequencies?
Robert,
I just found that ACMA has a very nice compilation licensed DTV
transmitters in Australia and their frequencies. Have a look at the
Excel spreadsheet linked on this page:
http://acma.gov.au/WEB/STANDARD/pc=PC_9150
The DTV tab has a list of the Area, callsign, and DTV center freq.
The Glossary tab mentions that DTV broadcasters can have an offset of
+/- 125 kHz from the DTV center freq.
If you could verify that the frequencies you are using for the problem
stations match the list, that would help eliminate commanded tuning
frequency as source of the problem.
Regards,
Andy
> BTW, I note that in linux/drivers/media/dvb/dvb-usb/cxusb.c:
> cxusb_dvico_xc3028_tuner_attach(), this declaration
>
> static struct xc2028_ctrl ctl = {
> .fname = XC2028_DEFAULT_FIRMWARE,
> .max_len = 64,
> .demod = XC3028_FE_ZARLINK456,
> };
>
> really should have ".type = XC2028_AUTO" or ".type = XC2028_D2633", but
> since XC2028_AUTO has a value of 0, it probably doesn't matter.
>
>
> Regards,
> Andy
>
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