diff options
Diffstat (limited to 'drivers/media/common/tuners/tuner-xc2028.c')
| -rw-r--r-- | drivers/media/common/tuners/tuner-xc2028.c | 79 |
1 files changed, 62 insertions, 17 deletions
diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c index f270e605da83..be51c294b375 100644 --- a/drivers/media/common/tuners/tuner-xc2028.c +++ b/drivers/media/common/tuners/tuner-xc2028.c @@ -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; + if ((priv->cur_fw.type & DTV78) && freq < 470000000) + offset -= 500000; /* - * We must adjust the offset by 500kHz when - * tuning a 7MHz VHF channel with DTV78 firmware - * (used in Australia, Italy and Germany) + * 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 ((priv->cur_fw.type & DTV78) && freq < 470000000) - offset -= 500000; + +#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 +1135,24 @@ 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; + demod = priv->ctrl.demod; + + /* + * Newer firmwares require a 200 kHz offset only for ATSC + */ + if (type == ATSC || priv->firm_version < 0x0302) + 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, |