linux-kernel - Re: [PATCH 08/18] V4L/DVB (4734): Tda826x: fix frontend selection for dvb

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Date:	Sun, 15 Oct 2006 14:38:04 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Michael Krufky <mkrufky@...uxtv.org>, linux-kernel@...r.kernel.org,
	linux-dvb-maintainer@...uxtv.org,
	Andrew de Quincey <adq_dvb@...skialf.net>
Subject: Re: [PATCH 08/18] V4L/DVB (4734): Tda826x: fix frontend selection for dvb_attach

On Sat, Oct 14, 2006 at 10:55:06PM -0300, Mauro Carvalho Chehab wrote:
> Em Sáb, 2006-10-14 às 21:14 +0200, Adrian Bunk escreveu:
> > On Sat, Oct 14, 2006 at 02:57:10PM -0400, Michael Krufky wrote:
> > > Adrian Bunk wrote:
> > > 
> > > Two separate problems, please do not confuse them.
> > > 
> > > My tda10086 and tda826x patches are correct -- there is no question of it.
> > 
> > The problem is that they don't fix the whole problem.
> Yes. Trent made two patches using your suggestion of checking for
> MODULE. I'll submit it to Linus probably tomorrow after some tests.
> 
> If you want to review, they are at:
> http://linuxtv.org/hg/v4l-dvb?cmd=changeset;node=b8c06286cb3a;style=gitweb
> http://linuxtv.org/hg/v4l-dvb?cmd=changeset;node=18a778dbf540;style=gitweb

At a first glance they look good.

> > To be honest and after looking deeper at it, I don't like this 
> > CONFIG_DVB_FE_CUSTOMIZE approach at all since it adds that much 
> > complexity for not much gain.
> Yes, it adds some complexity. The gain, however, is to allow having
> smaller kernel size on embedded systems and DVR using MythTV or Freevo.
> There's a similar feature for V4L (Autoselect pertinent
> encoders/decoders and other helper chips), that allows selecting just
> the needed stuff. 

I understand this, but I still don't like the solution.
But unless I can send a patch with a better solution, this is nothing I 
can complain about...

There are two things that might be changed even now:

The "default m if DVB_FE_CUSTOMISE" is something I do not like that 
much, especially considering that embedded users caring about kernel 
size are likely to use CONFIG_MODULES=n.

Another thing is that we might want to let DVB_FE_CUSTOMISE depend on 
EMBEDDED - for the average non-embedded user kernel size doesn't matter 
that much, and CONFIG_DVB_FE_CUSTOMIZE=y might often cause user 
confusion (similar to e.g. KEYBOARD_ATKBD depending on EMBEDDED, 
although many users might use USB keyboards).

> > I'd simply select all frontends unconditionally
> Most users do this, including me :)
> 
> Cheers, 
> Mauro.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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