linux-kernel - Re: 2.6.39 "tuner-core: remove usage of DIGITAL

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Date:	Thu, 14 Jul 2011 00:15:09 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-media@...r.kernel.org
Subject: Re: 2.6.39 "tuner-core: remove usage of DIGITAL_TV" breaks saa7134
 with mt2050

On 13/07/11 05:23, Mauro Carvalho Chehab wrote:
> Em 12-07-2011 18:21, Simon Arlott escreveu:
>> commit ad020dc2fe9039628cf6cef42cd1b76531ee8411
>> Author: Mauro Carvalho Chehab <mchehab@...hat.com>
>> Date:   Tue Feb 15 09:30:50 2011 -0200
>> 
>>     [media] tuner-core: remove usage of DIGITAL_TV
>>     
>> This breaks my Pinnacle PCTV 300i DVB-T cards as they can no longer tune
>> DVB-T.
>> 
>> [  540.010030] tuner 3-0043: Tuner doesn't support mode 3. Putting tuner to sleep
>> [  540.011017] tuner 2-0043: Tuner doesn't support mode 3. Putting tuner to sleep
>> [  540.012012] tuner 3-0060: Tuner doesn't support mode 3. Putting tuner to sleep
>> [  540.013029] tuner 2-0060: Tuner doesn't support mode 3. Putting tuner to sleep
>> 
>> saa7134 needs to indicate digital TV tuning to mt20xx but it looks like
>> tuner-core no longer has any way to allow a tuner to indicate support
>> for this?
>> 
>> (mt2050_set_tv_freq in mt20xx.c uses V4L2_TUNER_DIGITAL_TV)
> 
> Could you please try the enclosed patch? It should fix the issue.
> I should probably rename T_ANALOG_TV to just T_TV, but I'll do it on
> a next patch if this one works ok, as we don't want to send a renaming
> patch to -stable.

This fixes it. Tuner error messages could do with being error level - I
didn't see the message initially as I have the debugging turned off.
The -EINVAL never gets passed up to userspace.

> ---
> [media] Fix Digital TV breakage with mt20xx tuner
> 
> The mt20xx tuner passes V4L2_TUNER_DIGITAL_TV to tuner core. However, the
> check_mode code now doesn't handle it well. Change the logic there to
> avoid the breakage, and fix a test for analog-only at g_tuner.

Thanks,

-- 
Simon Arlott
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