On Sun, 08 Jun 2008 03:00:03 +0200
hermann pitton <hermann-pitton@xxxxxxxx> wrote:
>
> Am Samstag, den 07.06.2008, 13:42 +0800 schrieb timf:
> > timf wrote:
> > > Mauro Carvalho Chehab wrote:
> > >
> > >> On Fri, 06 Jun 2008 22:59:10 +0200
> > >> hermann pitton <hermann-pitton@xxxxxxxx> wrote:
> > >>
> > >>
> > >>
> > >>> Hi,
> > >>>
> > >>> Am Samstag, den 07.06.2008, 03:00 +0800 schrieb timf:
> > >>>
> > >>>
> > <snip>
> >
> > Hi all,
> >
> > Something very strange:
> > If in saa7134-dvb.c I do this:
> >
> > <snip>
> > static int configure_tda827x_fe_kw210(struct saa7134_dev *dev,
> > struct tda1004x_config *cdec_conf,
> > struct tda827x_config *tuner_conf)
> > {
> > dev->dvb.frontend = dvb_attach(tda10046_attach, cdec_conf,
> > &dev->i2c_adap);
> > if (dev->dvb.frontend) {
> > /* if (cdec_conf->i2c_gate)
> > dev->dvb.frontend->ops.i2c_gate_ctrl = tda8290_i2c_gate_ctrl; */
> > if (dvb_attach(tda827x_attach, dev->dvb.frontend,
> > cdec_conf->tuner_address,
> > &dev->i2c_adap, tuner_conf))
> > return 0;
> >
> > wprintk("no tda827x tuner found at addr: %02x\n",
> > cdec_conf->tuner_address);
> > }
> > return -EINVAL;
> > }
> > <snip>
> > case SAA7134_BOARD_KWORLD_DVBT_210:
> > /* if (configure_tda827x_fe(dev, &kworld_dvb_t_210_config, */
> > if (configure_tda827x_fe_kw210(dev, &kworld_dvb_t_210_config,
> > &tda827x_cfg_2) < 0)
> > goto dettach_frontend;
> > break;
> > <snip>
> > then I can scan all available DVB-T channels, and view them.
> > If I leave it as original, it won't scan/view SBS.
> >
> > Can someone tell me what part does this play?
> >
> > if (cdec_conf->i2c_gate)
> > dev->dvb.frontend->ops.i2c_gate_ctrl = tda8290_i2c_gate_ctrl;
>
> Tim,
>
> without looking in any detail, choosed to have enough for myself.
>
> Almost all, but not all, use the tda8290 analog IF demodulator within
> the saa7131e, on prior saa7135 stuff also present as a sepatate chip,
> as an i2c bridge to control the tuner, also if in DVB-T mode ...
>
> To deminish interference on the bus, it is only opened to send the
> tuning bytes and then closed again.
>
> IIRC, on your card are two tda8275a, which could serve as hybrid tuners,
> but on that early design it was choosen to burn some money in favor to
> have a first analog and DVB-T at once solution.
>
> Since you have two tuners, you are not depending on the DVB-T gate stuff
> for DVB-T, which is a point for swichting issues from analog to DVB else
> on single hybrid tuners. To have a digital tuner controlled from the
> analog IF demod some still don't get and cause a lot of trouble.
There's another possibility. It might be possible that Viro's patches broke
firmware load. Did firmware load worked before (with the same version you're using)?
Cheers,
Mauro
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