> -----Original Message----- > From: linux-media-owner@xxxxxxxxxxxxxxx [mailto:linux-media- > owner@xxxxxxxxxxxxxxx] On Behalf Of Malcolm Priestley > Sent: vendredi 1 juillet 2011 00:22 > To: Linux Media Mailing List > Cc: Sébastien RAILLARD (COEXSI) > Subject: [PATCH] STV0288 Fast Channel Acquisition > > 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. > Thanks Macolm for this patch! Regarding the TT-S-1500b, it's using a specific inittab, I hope Oliver can have a look and check if this patch is compatible with the ALPS BSBE1 tuner. Sebastien > 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" > in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo > info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
