[linux-dvb] Re: Full featured card summary

[Andrew de Quincey <adq_dvb@lidskialf.net>]

On Saturday 13 March 2004 15:00, you wrote:
> Andrew de Quincey wrote:
> > OK, this is getting far too confusing. Need to summarise this:
> >
> > We're trying two types of DVB-S-fullfeatured cards: the 1.3 and the 1.6
> >
> > The 1.3 works fine with the alps_bsrv2(101) driver
> > The 1.3 fails with the ves1x93(110) (polarisation switching)
> > The 1.3 fails with the ves1x93(cvs) (polarisation switching)
> >
> > I don't see how the 1.6 can be working with either as it is using a
> > completely different frontend.
> >
> > Klaus, you reported that the 1.3 fails completely for you with
> > ves1x93(cvs), and that the suggestion by Andreas doesn't help with the
> > polarization problem. That sounds weird 'cos Helmut says ves1x93(cvs)
> > only has the polarization problem, not that it fails totally. Can you try
> > Oliver's suggestion of resetting everything and retry ves1x93(cvs)?
> >
> > Is the above correct?
>
> Not quite.
>
> When I use the driver from yesterday's CVS it works a bit,
> but switching polarizations doesn't always work.
>
> With
>
>   0x80, 0x00, 0x31, 0xb0, 0x14, 0x00, 0xDC, 0x20,
>
> it is the same as before, and with
>
>   0x80, 0x00, 0x21, 0xb0, 0x14, 0x00, 0xDC, 0x00,

OK, in that case it shouldn't be the 0x20/0x00 change; that appears to be the 
voltage setting (0x20==13v, 0x30==18v, 0x00=OFF). So that change was just 
changing the default from 13v to OFF.

As for the 0x21/0x31. I do have the alps bsrv2 datasheet, but they don't go 
into much detail. They recommend 0x21 though and have a comment saying (MODE: 
QPSK/DVB). I don't know why 0x31 is working for you and not 0x21.

Looking at the source, the only other change I can see is to when it sets the 
tuner frequency. The attached patch will disable this change. Note: I have 
_no_ idea what it does; the sheet doesn't go into any details.
Index: linux/drivers/media/dvb/frontends/ves1x93.c
===================================================================
RCS file: /cvs/linuxtv/dvb-kernel/linux/drivers/media/dvb/frontends/ves1x93.c,v
retrieving revision 1.6
diff -u -r1.6 ves1x93.c
--- linux/drivers/media/dvb/frontends/ves1x93.c	11 Mar 2004 18:44:19 -0000	1.6
+++ linux/drivers/media/dvb/frontends/ves1x93.c	13 Mar 2004 15:23:38 -0000
@@ -148,9 +148,9 @@
         int ret;
         struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = data, .len = len };
 
-	ves1x93_writereg(i2c, 0x00, 0x11);
+//	ves1x93_writereg(i2c, 0x00, 0x11);
         ret = i2c->xfer (i2c, &msg, 1);
-	ves1x93_writereg(i2c, 0x00, 0x01);
+//	ves1x93_writereg(i2c, 0x00, 0x01);
 
         if (ret != 1)
                 printk("%s: i/o error (ret == %i)\n", __FUNCTION__, ret);