[linux-dvb] Technotrend C1500 budget dvb-c with QAM128 channels

Mattias Nordstrom nordstrom at realnode.com
Tue Feb 21 19:58:34 CET 2006


Michael Krufky wrote:
> Simo Kivimäki wrote:
> 
>> Mattias Nordstrom wrote:
>>
>>> I have a TT C1500 card (saa7146, STV0297) which had problems tuning
>>> channels at QAM128 (like the ones in the Finnish HTV / Welho network).
>>>
>>> A fix which seems to work perfectly so far is to change the delay for
>>> QAM128 to the same values as for QAM256 in stv0297_set_frontend(),
>>> stv0297.c (line ~395, kernel 2.6.15):
>>>
>>> case QAM_128:
>>>     delay = 200;
>>>     sweeprate = 500;
>>>     break;
>>>
>>> Anyone who can view QAM64 channels but isn't able to tune in to QAM128
>>> might want to give this a try.
>>
>>
>> That works fine for me too. Thanks.
>>
>> Someone could put that to the cvs.
> 
> 
> It looks to me like the attached patch achieves the desired effect,
> although I know little of the stv0297 driver, and even less about the TT
> 1500 card.
> 
> Mattias, even though I generated this patch (just for the sake of moving
> things along), would you care to sign-off on it?
> 
> Does anybody have a problem with this change at all?
> 
> 
> ------------------------------------------------------------------------
> 
> diff -r dc34f5271cc1 linux/drivers/media/dvb/frontends/stv0297.c
> --- a/linux/drivers/media/dvb/frontends/stv0297.c	Tue Feb 21 03:31:12 2006
> +++ b/linux/drivers/media/dvb/frontends/stv0297.c	Tue Feb 21 13:16:25 2006
> @@ -393,10 +393,6 @@
>  		break;
>  
>  	case QAM_128:
> -		delay = 150;
> -		sweeprate = 1000;
> -		break;
> -
>  	case QAM_256:
>  		delay = 200;
>  		sweeprate = 500;

Sure, I'll sign-off on it. How do you want it done?

Signed-off-by: Mattias Nordstrom <nordstrom at realnode.com>

Is that line enough or do you need a more "complete patch"?

Regards,

-- 
Mattias Nordstrom
CTO
Realnode Oy

nordstrom at realnode.com
www.realnode.com



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