Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=897b842296f1285a6b58e9170f7017022e2e2603
Commit: 897b842296f1285a6b58e9170f7017022e2e2603
Parent: 9ca01e780f8966a7a94f88ef5c54f340e117abea
Author: Chris Pascoe <[EMAIL PROTECTED]>
AuthorDate: Sun Dec 2 09:39:18 2007 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 19:04:01 2008 -0200
V4L/DVB (6854): xc2028: be more specific about when applying offset for
7MHz channels
We have been inserting a mystery 500kHz offset for tuning 7MHz channels,
however some experimentation reveals it is only needed under certain
conditions with specific firmware combinations. Document these and only
apply the offset when we know it is required.
Signed-off-by: Chris Pascoe <[EMAIL PROTECTED]>
Signed-off-by: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
---
drivers/media/video/tuner-xc2028.c | 11 ++++++++++-
1 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/drivers/media/video/tuner-xc2028.c
b/drivers/media/video/tuner-xc2028.c
index a6b05df..63a6fca 100644
--- a/drivers/media/video/tuner-xc2028.c
+++ b/drivers/media/video/tuner-xc2028.c
@@ -875,7 +875,16 @@ static int generic_set_freq(struct dvb_frontend *fe, u32
freq /* in HZ */,
rc = send_seq(priv, {0x00, 0x00});
} else {
offset = 2750000;
- if (priv->cur_fw.type & DTV7)
+ /*
+ * 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.
+ */
+ if (((priv->cur_fw.type & DTV7) &&
+ (priv->cur_fw.scode_table & (ZARLINK456 | DIBCOM52))) ||
+ ((priv->cur_fw.type & DTV78) && freq < 470000000))
offset -= 500000;
}
-
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