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| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-11-11 12:46:23 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-11-11 12:46:23 -0200 |
| commit | 39ce61a846c8e1fa00cb57ad5af021542e6e8403 (patch) | |
| tree | fc2ece73b3c54a805f9ac85d390f2388f741b46c /drivers/media | |
| parent | e9eb0dadba932940f721f9d27544a7818b2fa1c5 (diff) | |
| download | talos-op-linux-39ce61a846c8e1fa00cb57ad5af021542e6e8403.tar.gz talos-op-linux-39ce61a846c8e1fa00cb57ad5af021542e6e8403.zip | |
[media] dvb: Allow select between DVB-C Annex A and Annex C
DVB-C, as defined by ITU-T J.83 has 3 annexes. The differences between
Annex A and Annex C is that Annex C uses a subset of the modulation
types, and uses a different rolloff factor. A different rolloff means
that the bandwidth required is slicely different, and may affect the
saw filter configuration at the tuners. Also, some demods have different
configurations, depending on using Annex A or Annex C.
So, allow userspace to specify it, by changing the rolloff factor.
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_frontend.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c index 2c0acdb4d811..c849455458ea 100644 --- a/drivers/media/dvb/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb/dvb-core/dvb_frontend.c @@ -876,6 +876,7 @@ static int dvb_frontend_clear_cache(struct dvb_frontend *fe) c->symbol_rate = QAM_AUTO; c->code_rate_HP = FEC_AUTO; c->code_rate_LP = FEC_AUTO; + c->rolloff = ROLLOFF_AUTO; c->isdbt_partial_reception = -1; c->isdbt_sb_mode = -1; @@ -1030,6 +1031,7 @@ static void dtv_property_cache_init(struct dvb_frontend *fe, break; case FE_QAM: c->delivery_system = SYS_DVBC_ANNEX_AC; + c->rolloff = ROLLOFF_15; /* implied for Annex A */ break; case FE_OFDM: c->delivery_system = SYS_DVBT; |
