Hi,
Am Montag, den 01.06.2009, 20:00 -0400 schrieb Andy Walls:
> On Mon, 2009-06-01 at 17:20 +0200, Patch from Mauro Carvalho Chehab
> wrote:
> > The patch number 11918 was added via Mauro Carvalho Chehab
> > <[email protected]>
> > to http://linuxtv.org/hg/v4l-dvb master development tree.
> >
> > Kernel patches in this development tree may be modified to be backward
> > compatible with older kernels. Compatibility modifications will be
> > removed before inclusion into the mainstream Kernel
> >
> > If anyone has any objections, please let us know by sending a message to:
> > Linux Media Mailing List <[email protected]>
> >
> > ------
> >
> > From: Mauro Carvalho Chehab <[email protected]>
> > tuner-xc2028: Fix offset frequencies for DVB @ 6MHz
> >
> >
> > Both ATSC and DVB @ 6MHz bandwidth require the same offset.
> >
> > While we're fixing it, let's cleanup the bandwidth setup to better
> > reflect the fact that it is a function of the bandwidth.
> >
> > Thanks to Terry Wu <[email protected]> for pointing this issue and
> > to Andy Walls <[email protected]> for an initial patch for this fix.
> >
> > Priority: normal
> >
> > CC: Terry Wu <[email protected]>
> > CC: Andy Walls <[email protected]>
> > Signed-off-by: Mauro Carvalho Chehab <[email protected]>
>
> Acked-by: Andy Walls <[email protected]>
>
> You may want to emphasize with a comment that 'offset = 0' is used for
> T_ANALOG_TV. It's somewhat hidden by its initialization early in the
> function.
>
> Italy also appears to use 7 MHz VHF and 8 MHz UHF.
Germany too.
Cheers,
Hermann
>
> Regards,
> Andy
>
> > ---
> >
> > linux/drivers/media/common/tuners/tuner-xc2028.c | 32 ++++++++-------
> > 1 file changed, 19 insertions(+), 13 deletions(-)
> >
> > diff -r c78c18fe3dc9 -r e6a8672631a0
> > linux/drivers/media/common/tuners/tuner-xc2028.c
> > --- a/linux/drivers/media/common/tuners/tuner-xc2028.c Mon Jun 01
> > 11:46:08 2009 -0300
> > +++ b/linux/drivers/media/common/tuners/tuner-xc2028.c Mon Jun 01
> > 12:18:10 2009 -0300
> > @@ -921,22 +921,28 @@ static int generic_set_freq(struct dvb_f
> > * that xc2028 will be in a safe state.
> > * Maybe this might also be needed for DTV.
> > */
> > - if (new_mode == T_ANALOG_TV) {
> > + if (new_mode == T_ANALOG_TV)
> > rc = send_seq(priv, {0x00, 0x00});
> > - } else if (priv->cur_fw.type & ATSC) {
> > - offset = 1750000;
> > - } else {
> > - offset = 2750000;
> > +
> > + /*
> > + * Digital modes require an offset to adjust to the
> > + * proper frequency
> > + */
> > + if (new_mode != T_ANALOG_TV) {
> > + /* Sets the offset according with firmware */
> > + if (priv->cur_fw.type & DTV6)
> > + offset = 1750000;
> > + if (priv->cur_fw.type & DTV7)
> > + offset = 2250000;
> > + else /* DTV8 or DTV78 */
> > + offset = 2750000;
> > +
> > /*
> > - * We must adjust the offset by 500kHz in two cases in order
> > - * to correctly center the IF output:
> > - * 1) When the ZARLINK456 or DIBCOM52 tables were explicitly
> > - * selected and a 7MHz channel is tuned;
> > - * 2) When tuning a VHF channel with DTV78 firmware.
> > + * We must adjust the offset by 500kHz when
> > + * tuning a 7MHz VHF channel with DTV78 firmware
> > + * (used in Australia)
> > */
> > - if (((priv->cur_fw.type & DTV7) &&
> > - (priv->cur_fw.scode_table & (ZARLINK456 | DIBCOM52))) ||
> > - ((priv->cur_fw.type & DTV78) && freq < 470000000))
> > + if ((priv->cur_fw.type & DTV78) && freq < 470000000)
> > offset -= 500000;
> > }
> >
> >
> >
> > ---
> >
> > Patch is available at:
> > http://linuxtv.org/hg/v4l-dvb/rev/e6a8672631a0f5f549f5ee5db3acac4f35013942
> >
>
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