[linux-dvb] [FIXEd] Bug Report - Twinhan vp-1020, bt_8xx driver + frontend

Alain Turbide aturbide at rogers.com
Tue Dec 2 20:21:36 CET 2008


modprobe dst dst_algo=1 (to select the HW tuning algo ) works as well.. 
Didnt realize the hw algo worked for those cards.

----- Original Message ----- 
From: "Alain Turbide" <aturbide at rogers.com>
To: <linux-dvb at linuxtv.org>
Sent: Tuesday, December 02, 2008 2:05 PM
Subject: Re: [linux-dvb] [FIXEd] Bug Report - Twinhan vp-1020,bt_8xx driver 
+ frontend


> Well, it's not a difficult fix now that I see it.  The issue was that the
> original default for FE_ALGO_SW was 0 while FE_ALGO_HW was 1.
> Since there is an older documented option for the dst module called 
> dst_algo
> that some people might still be using to force the tuning algo to sofware 
> by
> setting dst_algo=0, there is no choice but to also make the default of
> DVBFE_ALGO_SW to also be 0 so that the values will match and the new code
> will still function with users who force dst_algo=0 on the dst module 
> load..
> The fix would thus be to go from: this in dvb_frontend.h
> enum dvbfe_algo {
>        DVBFE_ALGO_HW                   = (1 <<  0),
>        DVBFE_ALGO_SW                   = (1 << 1),
>        DVBFE_ALGO_CUSTOM               = (1 <<  2),
>        DVBFE_ALGO_RECOVERY             = (1 << 31)
> };
>
> to this:
> enum dvbfe_algo {
>        DVBFE_ALGO_HW                   = (1 <<  0),
>        DVBFE_ALGO_SW                   = 0,
>        DVBFE_ALGO_CUSTOM               = (1 <<  2),
>        DVBFE_ALGO_RECOVERY             = (1 << 31)
> };
>
> This is what I've done now and works well. This is the only change 
> required
> to fix the issue.   In dst.c we could also default dst_algo to
> DVB_FRONTEND_SW instead of 0 to make it more robust.  I can't see any code
> else where that depends on DVBFE_ALGO_SW being set to 2.
>
> For those that do not want to patch code, the alternate way to get the 
> cards
> to work is to simply load the dst module with the dst_algo parm set. to 2:
> ie. modprobe dst dst_algo=2   ( to have the dst module return the current
> value of DVBFE_ALGO_SW) back to the front end code.
>
>
>
>
>
> ----- Original Message ----- 
> From: "VDR User" <user.vdr at gmail.com>
> To: "Alain Turbide" <aturbide at rogers.com>
> Cc: <linux-dvb at linuxtv.org>
> Sent: Tuesday, December 02, 2008 12:37 PM
> Subject: Re: [linux-dvb] [FIXEd] Bug Report - Twinhan vp-1020, bt_8xx 
> driver
> + frontend
>
>
>> 2008/12/1 Alain Turbide <aturbide at rogers.com>:
>>> Digging in a little further.The dst_algo (which the twinhan uses) is set
>>> to
>>> return  0 as the default setting for the SW algo in dst.c, yet in
>>> dvb_frontend.h, the DVBFE_ALGO_SW algo is defined as 2.  Which is the
>>> correct one here? Should dst.c be changed to return 2 as sw or is 0 the
>>> correct number for the SW algo and thus DVBFE_ALGO_SW be changed to
>>> return
>>> 0?
>>
>> Is nobody else looking into this?!  I would think this bug would have
>> received a little more attention considering the number of people
>> affected!
>>
>> Please keep up the work, it's much appreciated!  I, on behalf of
>> several others who aren't subscribed to the ml, am monitoring this
>> thread in hopes of a proper fix.
>>
>> Thanks!
>> -Derek
>
>
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