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Commit 59152b1c authored by tvboxspy's avatar tvboxspy Committed by Mauro Carvalho Chehab
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[media] STV0288 frontend provide wider carrier search and DVB-S2 drop out. resend 



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: default avatarMalcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 6783fe5f

drivers/media/dvb/frontends/stv0288.c

+21 −8
Original line number Original line Diff line number Diff line
@@ -127,6 +127,11 @@ static int stv0288_set_symbolrate(struct dvb_frontend *fe, u32 srate) 
	if ((srate < 1000000) || (srate > 45000000))

	if ((srate < 1000000) || (srate > 45000000))

		return -EINVAL;

		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 = (unsigned int)srate / 1000;





		temp = temp * 32768;

		temp = temp * 32768;
@@ -461,6 +466,7 @@ static int stv0288_set_frontend(struct dvb_frontend *fe, 




	char tm;

	char tm;

	unsigned char tda[3];

	unsigned char tda[3];

	u8 reg, time_out = 0;





	dprintk("%s : FE_SET_FRONTEND\n", __func__);

	dprintk("%s : FE_SET_FRONTEND\n", __func__);
@@ -488,22 +494,29 @@ static int stv0288_set_frontend(struct dvb_frontend *fe, 
	/* Carrier lock control register */

	/* Carrier lock control register */

	stv0288_writeregI(state, 0x15, 0xc5);

	stv0288_writeregI(state, 0x15, 0xc5);





	tda[0] = 0x2b; /* CFRM */

	tda[2] = 0x0; /* CFRL */

	tda[2] = 0x0; /* CFRL */

	for (tm = -6; tm < 7;) {

	for (tm = -9; tm < 7;) {

		/* Viterbi status */

		/* Viterbi status */

		if (stv0288_readreg(state, 0x24) & 0x8)

		reg = stv0288_readreg(state, 0x24);

		if (reg & 0x8)

				break;

		if (reg & 0x80) {

			time_out++;

			if (time_out > 10)

				break;

				break;



			tda[2] += 40;

			tda[2] += 40;

			if (tda[2] < 40)

			if (tda[2] < 40)

				tm++;

				tm++;

		} else {

			tm++;

			tda[2] = 0;

			time_out = 0;

		}

		tda[1] = (unsigned char)tm;

		tda[1] = (unsigned char)tm;

		stv0288_writeregI(state, 0x2b, tda[1]);

		stv0288_writeregI(state, 0x2b, tda[1]);

		stv0288_writeregI(state, 0x2c, tda[2]);

		stv0288_writeregI(state, 0x2c, tda[2]);

		udelay(30);

		udelay(30);

	}

	}



	state->tuner_frequency = c->frequency;

	state->tuner_frequency = c->frequency;

	state->fec_inner = FEC_AUTO;

	state->fec_inner = FEC_AUTO;

	state->symbol_rate = c->symbol_rate;

	state->symbol_rate = c->symbol_rate;