On Wednesday 29 June 2011 15:16:10 Sébastien RAILLARD wrote:
> Dear all,
>
> We have found what seems to be a tuning issue in the driver for the ALPS
> BSBE1-D01A used in the new TT-S-1500b card from Technotrend.
> On some transponders, like ASTRA 19.2E 11817-V-27500, the card can work very
> well (no lock issues) for hours.
>
> 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.
Afaics the problem is caused by the tuning loop
for (tm = -6; tm < 7;)
in stv0288_set_frontend().
I doubt that this code works reliably.
Apparently it never obtains a lock within the given delay (30us).
Could you please try the attached patch?
It disables the loop and tries to tune to the center frequency.
CU
Oliver
--
----------------------------------------------------------------
VDR Remote Plugin 0.4.0: http://www.escape-edv.de/endriss/vdr/
4 MByte Mod: http://www.escape-edv.de/endriss/dvb-mem-mod/
Full-TS Mod: http://www.escape-edv.de/endriss/dvb-full-ts-mod/
----------------------------------------------------------------
diff --git a/drivers/media/dvb/frontends/stv0288.c b/drivers/media/dvb/frontends/stv0288.c
index 8e0cfad..4ffe7da 100644
--- a/drivers/media/dvb/frontends/stv0288.c
+++ b/drivers/media/dvb/frontends/stv0288.c
@@ -488,6 +488,10 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
/* Carrier lock control register */
stv0288_writeregI(state, 0x15, 0xc5);
+#if 1 /* TEST */
+ stv0288_writeregI(state, 0x2b, 0);
+ stv0288_writeregI(state, 0x2c, 0);
+#else
tda[0] = 0x2b; /* CFRM */
tda[2] = 0x0; /* CFRL */
for (tm = -6; tm < 7;) {
@@ -503,6 +507,7 @@ static int stv0288_set_frontend(struct dvb_frontend *fe,
stv0288_writeregI(state, 0x2c, tda[2]);
udelay(30);
}
+#endif
state->tuner_frequency = c->frequency;
state->fec_inner = FEC_AUTO;
