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V4L/DVB: tuner-xc2028: fix tuning logic to solve a regression in Australia

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There's one reported regression in Australia (DTV7) and some
reported troubles with newer firmwares found on xc3028l chips.
Rework the logic to improve tuner on those cases.

Thanks-to: Robert Lowery <rglowery@exemail.com.au>
Thanks-to: Stefan Ringel <stefan.ringel@arcor.de>
Tested-by: Robert Lowery <rglowery@exemail.com.au>
CC: stable.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2010-02-19 02:45:00 -02:00
parent d90a4ae4ae
commit 7f2199c03b
1 changed files with 61 additions and 18 deletions
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79
drivers/media/common/tuners/tuner-xc2028.c
View file

@ -917,30 +917,68 @@ 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});
/*
* Digital modes require an offset to adjust to the
* proper frequency.
* Analog modes require offset = 0
*/
if (new_mode == T_DIGITAL_TV) {
/* Sets the offset according with firmware */
/* Analog modes require offset = 0 */
} else {
/*
* Digital modes require an offset to adjust to the
* proper frequency. The offset depends on what
* firmware version is used.
*/
/*
* Adjust to the center frequency. This is calculated by the
* formula: offset = 1.25MHz - BW/2
* For DTV 7/8, the firmware uses BW = 8000, so it needs a
* further adjustment to get the frequency center on VHF
*/
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 when
* tuning a 7MHz VHF channel with DTV78 firmware
* (used in Australia, Italy and Germany)
*/
if ((priv->cur_fw.type & DTV78) && freq < 470000000)
offset -= 500000;
/*
* xc3028 additional "magic"
* Depending on the firmware version, it needs some adjustments
* to properly centralize the frequency. This seems to be
* needed to compensate the SCODE table adjustments made by
* newer firmwares
*/
#if 1
/*
* The proper adjustment would be to do it at s-code table.
* However, this didn't work, as reported by
* Robert Lowery <rglowery@exemail.com.au>
*/
if (priv->cur_fw.type & DTV7)
offset += 500000;
#else
/*
* Still need tests for XC3028L (firmware 3.2 or upper)
* So, for now, let's just comment the per-firmware
* version of this change. Reports with xc3028l working
* with and without the lines bellow are welcome
*/
if (priv->firm_version < 0x0302) {
if (priv->cur_fw.type & DTV7)
offset += 500000;
} else {
if (priv->cur_fw.type & DTV7)
offset -= 300000;
else if (type != ATSC) /* DVB @6MHz, DTV 8 and DTV 7/8 */
offset += 200000;
}
#endif
}
div = (freq - offset + DIV / 2) / DIV;
@ -1097,17 +1135,22 @@ static int xc2028_set_params(struct dvb_frontend *fe,
/* All S-code tables need a 200kHz shift */
if (priv->ctrl.demod) {
demod = priv->ctrl.demod + 200;
/*
* Newer firmwares require a 200 kHz offset only for ATSC
*/
if (type == ATSC || priv->firm_version < 0x0302)
demod = priv->ctrl.demod + 200;
/*
* The DTV7 S-code table needs a 700 kHz shift.
* Thanks to Terry Wu <terrywu2009@gmail.com> for reporting this
*
* DTV7 is only used in Australia. Germany or Italy may also
* use this firmware after initialization, but a tune to a UHF
* channel should then cause DTV78 to be used.
*
* Unfortunately, on real-field tests, the s-code offset
* didn't work as expected, as reported by
* Robert Lowery <rglowery@exemail.com.au>
*/
if (type & DTV7)
demod += 500;
}
return generic_set_freq(fe, p->frequency,