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V4L/DVB (11918): tuner-xc2028: Fix offset frequencies for DVB @ 6MHz

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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 <terrywu2009@gmail.com> for pointing this issue and
to Andy Walls <awalls@radix.net> for an initial patch for this fix.

Cc: Terry Wu <terrywu2009@gmail.com>
Acked-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-06-01 12:18:10 -03:00
parent a1014d70db
commit 0a863975e2
1 changed files with 20 additions and 13 deletions
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33
drivers/media/common/tuners/tuner-xc2028.c
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@ -917,22 +917,29 @@ static int generic_set_freq(struct dvb_frontend *fe, u32 freq /* in HZ */,
* 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.
* Analog modes require offset = 0
*/
if (new_mode != T_ANALOG_TV) {
/* Sets the offset according with firmware */
if (priv->cur_fw.type & DTV6)
offset = 1750000;
else 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, Italy and Germany)
*/
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;
}