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[media] STV0288 frontend provide wider carrier search and DVB-S2 drop out. resend

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The following patch provides wider carrier search.

As with existing code search starts at MSB aligned. The boundary
is widened to start at -9.  In order to save time, if no carrier is
detected at the start it advances to the next alignment until carrier
is found.

The stv0288 will detect a DVB-S2 carrier on all steps , a
time out of 11 steps is introduced to drop out of the loop.

In stv0288_set_symbol carrier and timing loops are restored to
default values (inittab) before setting the symbol rate on each tune. A
slight drift was noticed with full scan in the higher IF frequencies of
each band.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
tvboxspy 2011-07-10 18:37:13 -03:00 committed by Mauro Carvalho Chehab
parent 6783fe5f16
commit 59152b1cf1
1 changed files with 21 additions and 8 deletions
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29
drivers/media/dvb/frontends/stv0288.c
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@ -127,6 +127,11 @@ static int stv0288_set_symbolrate(struct dvb_frontend *fe, u32 srate)
if ((srate < 1000000) || (srate > 45000000))
return -EINVAL;
stv0288_writeregI(state, 0x22, 0);
stv0288_writeregI(state, 0x23, 0);
stv0288_writeregI(state, 0x2b, 0xff);
stv0288_writeregI(state, 0x2c, 0xf7);
temp = (unsigned int)srate / 1000;
temp = temp * 32768;
@ -461,6 +466,7 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
char tm;
unsigned char tda[3];
u8 reg, time_out = 0;
dprintk("%s : FE_SET_FRONTEND\n", __func__);
@ -488,22 +494,29 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
/* Carrier lock control register */
stv0288_writeregI(state, 0x15, 0xc5);
tda[0] = 0x2b; /* CFRM */
tda[2] = 0x0; /* CFRL */
for (tm = -6; tm < 7;) {
for (tm = -9; tm < 7;) {
/* Viterbi status */
if (stv0288_readreg(state, 0x24) & 0x8)
break;
tda[2] += 40;
if (tda[2] < 40)
reg = stv0288_readreg(state, 0x24);
if (reg & 0x8)
break;
if (reg & 0x80) {
time_out++;
if (time_out > 10)
break;
tda[2] += 40;
if (tda[2] < 40)
tm++;
} else {
tm++;
tda[2] = 0;
time_out = 0;
}
tda[1] = (unsigned char)tm;
stv0288_writeregI(state, 0x2b, tda[1]);
stv0288_writeregI(state, 0x2c, tda[2]);
udelay(30);
}
state->tuner_frequency = c->frequency;
state->fec_inner = FEC_AUTO;
state->symbol_rate = c->symbol_rate;