On Wed, 2011-06-29 at 15:16 +0200, Sébastien RAILLARD (COEXSI) wrote:
> On some other transponders, like ASTRA 19.2E 11567-V-22000, the card nearly
> never manage to get the lock: it's looking like the signal isn't good
> enough.
> I turned on the debugging of the stb6000 and stv0288 modules, but I can't
> see anything wrong.
I have had similar problems with the stv0288 on astra 19.2 and 28.2 with
various frequencies.
I have been using this patch for some time which seems to improve
things.
The STV0288 has a fast channel function which eliminates
the need for software carrier search.
The patch removes the slow carrier search and replaces
it with this faster and more reliable built-in chip function.
If carrier is lost while channel is running, fast channel
attempts to recover it.
The patch also reguires registers 50-57 to be set correctly
with inittab. All current combinations in the kernel media
tree have been checked and tested.
Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
---
drivers/media/dvb/frontends/stv0288.c | 75 +++++++++++++++++++++-----------
1 files changed, 49 insertions(+), 26 deletions(-)
diff --git a/drivers/media/dvb/frontends/stv0288.c b/drivers/media/dvb/frontends/stv0288.c
index 8e0cfad..fa5cba5 100644
--- a/drivers/media/dvb/frontends/stv0288.c
+++ b/drivers/media/dvb/frontends/stv0288.c
@@ -142,6 +142,12 @@ static int stv0288_set_symbolrate(struct dvb_frontend *fe, u32 srate)
stv0288_writeregI(state, 0x28, b[0]);
stv0288_writeregI(state, 0x29, b[1]);
stv0288_writeregI(state, 0x2a, b[2]);
+
+ stv0288_writeregI(state, 0x22, 0x0);
+ stv0288_writeregI(state, 0x23, 0x0);
+ stv0288_writeregI(state, 0x2b, 0x0);
+ stv0288_writeregI(state, 0x2c, 0x0);
+
dprintk("stv0288: stv0288_set_symbolrate\n");
return 0;
@@ -309,12 +315,13 @@ static u8 stv0288_inittab[] = {
0xf1, 0x0,
0xf2, 0xc0,
0x51, 0x36,
- 0x52, 0x09,
- 0x53, 0x94,
- 0x54, 0x62,
- 0x55, 0x29,
- 0x56, 0x64,
- 0x57, 0x2b,
+ 0x52, 0x21,
+ /* Fast Channel MIN/MAX Freqency Bounds MSB bit 7 sets stop */
+ 0x53, 0x94, /*Min MSB (0-6)*/
+ 0x54, 0x62, /*Min LSB*/
+ 0x55, 0x29, /*Max MSB (0-6)*/
+ 0x56, 0x64, /*Max LSB*/
+ 0x57, 0x2b, /* Increment (signed) */
0xff, 0xff,
};
@@ -356,6 +363,35 @@ static int stv0288_init(struct dvb_frontend *fe)
return 0;
}
+/* STV0288 Fast channel accquisition and blind search */
+static int stv0288_get_fast(struct dvb_frontend *fe)
+{
+ struct stv0288_state *state = fe->demodulator_priv;
+ int timeout = 0;
+
+ /* Coarse Tune */
+ stv0288_writeregI(state, 0x50, 0x35);
+ /* Wait 15ms */
+ msleep(15);
+ /* Fine Tune Control & Center Carrier */
+ stv0288_writeregI(state, 0x50, 0x16);
+ /* Check for Timing lock */
+ while (!(stv0288_readreg(state, 0x1e) & 0x80)) {
+ if (timeout++ > 5)
+ return -EINVAL;
+ msleep(15);
+ }
+
+ /* Center Carrier for further length of time */
+ stv0288_writeregI(state, 0x50, 0x14);
+ udelay(500);
+ /* Fast Search End*/
+ stv0288_writeregI(state, 0x50, 0x10);
+
+ return 0;
+}
+
+
static int stv0288_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct stv0288_state *state = fe->demodulator_priv;
@@ -369,6 +405,9 @@ static int stv0288_read_status(struct dvb_frontend *fe, fe_status_t *status)
*status = 0;
if (sync & 0x80)
*status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
+ else
+ stv0288_get_fast(fe); /*try to recover*/
+
if (sync & 0x10)
*status |= FE_HAS_VITERBI;
if (sync & 0x08) {
@@ -458,9 +497,7 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
{
struct stv0288_state *state = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
-
- char tm;
- unsigned char tda[3];
+ int ret = 0;
dprintk("%s : FE_SET_FRONTEND\n", __func__);
@@ -487,28 +524,14 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
stv0288_set_symbolrate(fe, c->symbol_rate);
/* Carrier lock control register */
stv0288_writeregI(state, 0x15, 0xc5);
-
- tda[0] = 0x2b; /* CFRM */
- tda[2] = 0x0; /* CFRL */
- for (tm = -6; tm < 7;) {
- /* Viterbi status */
- if (stv0288_readreg(state, 0x24) & 0x8)
- break;
-
- tda[2] += 40;
- if (tda[2] < 40)
- tm++;
- tda[1] = (unsigned char)tm;
- stv0288_writeregI(state, 0x2b, tda[1]);
- stv0288_writeregI(state, 0x2c, tda[2]);
- udelay(30);
- }
+ /* Search for carrier */
+ ret = stv0288_get_fast(fe);
state->tuner_frequency = c->frequency;
state->fec_inner = FEC_AUTO;
state->symbol_rate = c->symbol_rate;
- return 0;
+ return ret;
}
static int stv0288_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
--
1.7.4.1
--
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