[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: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 21 insertions, 8 deletions

diff --git a/drivers/media/dvb/frontends/stv0288.c b/drivers/media/dvb/frontends/stv0288.c
index 8e0cfadba688..0aa3962ff18b 100644
--- a/drivers/media/dvb/frontends/stv0288.c
+++ b/drivers/media/dvb/frontends/stv0288.c
@@ -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;