diff options
| author | Christophe Thommeret <hftom@free.fr> | 2008-10-16 03:01:32 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2008-10-18 00:29:46 +0400 |
| commit | 745632147d54cd4db6812045351510ebd3981a24 (patch) | |
| tree | cc1e0d8dada7b2ce4bad2851c3ffea320bd61322 /drivers/media | |
| parent | 430189da042f8cc3305b8fbbce18ea103501fb90 (diff) | |
| download | linux-745632147d54cd4db6812045351510ebd3981a24.tar.xz | |
V4L/DVB (9270): cx24116: optimise emulated auto-pilot
Christophe divulged the following:
"Since 8PSK (and higher mod) signals are very likely to have pilot symbols,
pilot_auto should start with pilot_on for 8PSK.
And since QPSK signals are unlikely to have pilot, pilot_auto should start
with pilot_off for QPSK.
Without the patch:
QPSK tuning delay: ~100ms
8PSK tuning delay: ~900ms
with patch:
QPSK tuning delay: ~100ms
8PSK tuning delay: ~100ms
"
This patch does as Cristophe asks. In emulated auto-pilot we
choose pilot-on for tuning PSK_8 and pilot-off for
tuning QPSK.
Signed-off-by: Darron Broad <darron@kewl.org>
Signed-off-by: Steven Toth <stoth@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb/frontends/cx24116.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/media/dvb/frontends/cx24116.c b/drivers/media/dvb/frontends/cx24116.c index 8afdfbec551b..fe62f92f6601 100644 --- a/drivers/media/dvb/frontends/cx24116.c +++ b/drivers/media/dvb/frontends/cx24116.c @@ -1248,7 +1248,10 @@ static int cx24116_set_frontend(struct dvb_frontend *fe, switch (c->pilot) { case PILOT_AUTO: /* Not supported but emulated */ - retune = 2; /* Fall-through */ + state->dnxt.pilot_val = (c->modulation == QPSK) + ? CX24116_PILOT_OFF : CX24116_PILOT_ON; + retune = 2; + break; case PILOT_OFF: state->dnxt.pilot_val = CX24116_PILOT_OFF; break; |