[linux-dvb] [PATCH] Re: Twinhan VisionPlus DVB-T Card not working

[Terry Barnaby <terry1@beam.ltd.uk>]

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Terry Barnaby wrote:
> Hi,
> 
> I am having a problem with the latest DVB drivers.
> I have a Twinhan VisionPlus DVB-T card (and other DVB cards) in my
> MythTv server running Fedora 8. This is running fine
> with the Fedora stock kernel: 2.6.26.6-49.fc8.
> 
> However, I have now added a Hauppauge DVB-S2 and so have been
> trying the latest DVB Mercurial DVB tree.
> This compiles and installs fine and the two DVB-T cards and the
> new DVB-S card are recognised and has /dev/dvb entries.
> The first DVB-T card, a Twinhan based on the SAA7133/SAA7135
> works fine but the Twinhan VisionPlus, which is Bt878 will not
> tune in.
> 
> Any ideas ?
> Has there been any recent changes to the Bt878 driver that could
> have caused this ?
> 

I have tracked this down to a bug in the bt8xx/dst frontend.
It appears that the front end tuning algorithm number as used in
dvb_frontend.c has changed format but the default setting in
bt8xx/dst has not been updated to match.

This patch sets the default algorithm to be software tuning as,
I believe, was the original setting. However, I wonder if
it should be set to use hardware tuning by default ...


Cheers


Terry

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diff -r 5dc4a6b381f6 linux/drivers/media/dvb/bt8xx/dst.c
--- a/linux/drivers/media/dvb/bt8xx/dst.c	Wed Nov 19 13:01:33 2008 -0200
+++ b/linux/drivers/media/dvb/bt8xx/dst.c	Fri Nov 21 10:44:43 2008 +0000
@@ -38,9 +38,9 @@ module_param(dst_addons, int, 0644);
 module_param(dst_addons, int, 0644);
 MODULE_PARM_DESC(dst_addons, "CA daughterboard, default is 0 (No addons)");
 
-static unsigned int dst_algo;
+static unsigned int dst_algo = DVBFE_ALGO_SW;
 module_param(dst_algo, int, 0644);
-MODULE_PARM_DESC(dst_algo, "tuning algo: default is 0=(SW), 1=(HW)");
+MODULE_PARM_DESC(dst_algo, "tuning algo: default is DVBFE_ALGO_SW (options: DVBFE_ALGO_HW)");
 
 #define HAS_LOCK		1
 #define ATTEMPT_TUNE		2

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