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V4L/DVB (6875): tuner-xc2028: ATSC requires 1.75 MHz tuning offset

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In my testing yesterday, I was using a scan file tailored specifically
for a unique test situation -- As it turns out, this scan file was bad,
and I will use the one included inside dvb-apps for testing for now on.

I've tested with other ATSC tuners just to confirm, using:

us-ATSC-center-frequencies-8VSB

Anyhow, as it turns out, the tuner-xc2028 *does* require a tuning offset
for ATSC.  Even though the linux-dvb api passes in center frequencies
from userspace, apparantly the xceive firmware is already factoring in
the tuning offset to center.

In order to make the device function using the same scan files /
channels.conf configurations as other atsc devices, we must offset by
1.75 MHz.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2007-12-18 10:42:33 -03:00 committed by Mauro Carvalho Chehab
parent 0b6a3342a6
commit d536c9df41
1 changed files with 3 additions and 1 deletions
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4
drivers/media/video/tuner-xc2028.c
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@ -873,7 +873,9 @@ static int generic_set_freq(struct dvb_frontend *fe, u32 freq /* in HZ */,
*/
if (new_mode == T_ANALOG_TV) {
rc = send_seq(priv, {0x00, 0x00});
} else if (!(priv->cur_fw.type & ATSC)) {
} else if (priv->cur_fw.type & ATSC) {
offset = 1750000;
} else {
offset = 2750000;
/*
* We must adjust the offset by 500kHz in two cases in order