linux-kernel - RE: [PATCHv2] ISP:BUILD:FIX: Move media_entity

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Date:	Wed, 24 Aug 2011 17:49:01 +0530
From:	"Hiremath, Vaibhav" <hvaibhav@...com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"Ravi, Deepthy" <deepthy.ravi@...com>
CC:	"mchehab@...radead.org" <mchehab@...radead.org>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: RE: [PATCHv2] ISP:BUILD:FIX: Move media_entity_init() and


> -----Original Message-----
> From: Laurent Pinchart [mailto:laurent.pinchart@...asonboard.com]
> Sent: Wednesday, August 24, 2011 5:00 PM
> To: Ravi, Deepthy
> Cc: mchehab@...radead.org; linux-media@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-omap@...r.kernel.org; Hiremath, Vaibhav
> Subject: Re: [PATCHv2] ISP:BUILD:FIX: Move media_entity_init() and
> 
> Hi,
> 
> On Wednesday 24 August 2011 13:21:27 Ravi, Deepthy wrote:
> > On Wed, Aug 24, 2011 at 4:47 PM, Laurent Pinchart wrote:
> > > On Friday 19 August 2011 15:48:45 Deepthy Ravi wrote:
> > >> From: Vaibhav Hiremath <hvaibhav@...com>
> > >>
> > >> Fix the build break caused when CONFIG_MEDIA_CONTROLLER
> > >> option is disabled and if any sensor driver has to be used
> > >> between MC and non MC framework compatible devices.
> > >>
> > >> For example,if tvp514x video decoder driver migrated to
> > >> MC framework is being built without CONFIG_MEDIA_CONTROLLER
> > >> option enabled, the following error messages will result.
> > >> drivers/built-in.o: In function `tvp514x_remove':
> > >> drivers/media/video/tvp514x.c:1285: undefined reference to
> > >> `media_entity_cleanup'
> > >> drivers/built-in.o: In function `tvp514x_probe':
> > >> drivers/media/video/tvp514x.c:1237: undefined reference to
> > >> `media_entity_init'
> > >
> > > If the tvp514x is migrated to the MC framework, its Kconfig option
> should
> > > depend on MEDIA_CONTROLLER.
> >
> > The same TVP514x driver is being used for both MC and non MC compatible
> > devices, for example OMAP3 and AM35x. So if it is made dependent on
> MEDIA
> > CONTROLLER, we cannot enable the driver for MC independent devices.
> 
> Then you should use conditional compilation in the tvp514x driver itself.
> Or
[Hiremath, Vaibhav] No. I am not in favor of conditional compilation in driver code. 

> better, port the AM35x driver to the MC API.
> 
[Hiremath, Vaibhav] 
Why should we use MC if I have very simple device (like AM35x) which only supports single path? I can very well use simple V4L2 sub-dev based approach (master - slave), isn't it?

Thanks,
Vaibhav

> --
> Regards,
> 
> Laurent Pinchart
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