[linux-dvb] Re: Patch for cards with the Philips CD1516 tuner box (spXXXX?)

[Juha Yrjölä <jyrjola@cc.hut.fi>]

Hi,

On Tue, Oct 15, 2002 at 01:41:48AM +0300, Marko Kenttälä wrote:

> Same for me with Siemens DVB-C rev. 1.5. Here's a patch that I can get 
> sometimes to tune to QAM128 channels. It seems that there are either 
> different versions of Siemens DVB-C boards or differences in cable 
> transmissions because same code do not work for every Siemens user. 
> REL-0-9-2 tunes every time to QAM128 for me but I get some glitches every 
> now and then, QAM64 is perfect in both newstruct and REL-0-9-2.

--- DVB/driver/frontends/ves1820.c.bak  Tue Oct 15 00:38:03 2002                
+++ DVB/driver/frontends/ves1820.c      Tue Oct 15 01:30:58 2002                
@@ -151,7 +151,7 @@ 
 int tuner_set_tv_freq (struct dvb_frontend *frontend, u32 freq, u8 pwr)
 {
         u32 div;
-       static int freq_mod [] = { 36750000, 36125000 };
+       static int freq_mod [] = { 36125000, 36125000 };

After this, the locking frequencies on my Siemens rev1.3 board are
shifted exactly 625 kHz upwards. (i.e. what once used to lock at
150000 kHz now locks at 150625 kHz.) I know for certain that
150000 kHz should be the right frequency, since this is what both the
cable operator and a Hauppauge DVB-C card tells me. Maybe we might
try with different freq_mod values depending on the revision.

@@ -168,7 +168,7 @@
                buf[3] = (freq < 174000000 ? 0x88 :
                          freq < 470000000 ? 0x84 : 0x81) | (pwr << 6);
        } else {
-               freq += freq_mod[tuner_type];
+               /*freq += freq_mod[tuner_type];*/
                buf[2] |= pwr << 6;
                buf[3] = (freq < 174000000 ? 0xa1 :
                          freq < 454000000 ? 0x92 : 0x34);

This doesn't seem to break anything, at least with me. I can still lock
to all channels. I think the patch is correct; the frequency addition
is not needed there.

Cheers,
Juha


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