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

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Date:	Tue, 6 Sep 2011 16:47:31 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	"Hiremath, Vaibhav" <hvaibhav@...com>
Cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	"Ravi, Deepthy" <deepthy.ravi@...com>,
	"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

Hi Vaibhav,

On Tuesday 06 September 2011 16:12:35 Hiremath, Vaibhav wrote:
> On Monday, September 05, 2011 6:20 PM Laurent Pinchart wrote:
> > On Sunday 04 September 2011 15:32:28 Mauro Carvalho Chehab wrote:
> 
> <snip>
> 
> > I don't mind splitting the config option. An alternative would be to
> > compile media_entity_init() and media_entity_cleanup() based on
> > CONFIG_MEDIA_SUPPORT instead of CONFIG_MEDIA_CONTROLLER, but that looks a
> > bit hackish to me.
> > 
> > > Also, I don't like the idea of increasing drivers complexity for the
> > > existing drivers that work properly without MC. All those core
> > > conversions that were done in the last two years caused already too much
> > > instability to them.
> > > 
> > > We should really avoid touching on them again for something that won't
> > > be adding any new feature nor fixing any known bug.
> > 
> > We don't have to convert them all in one go right now, we can implement
> > pad-level operations support selectively when a subdev driver becomes used
> > by an MC-enabled host/bridge driver.
> 
> I completely agree that we should not be duplicating the code just for sake
> of it.
> 
> Isn't the wrapper approach seems feasible here?

As explained in a previous e-mail, a wrapper sounds like a good approach to 
me, to emulate video::* operations based on pad::* operations. We want to move 
to pad::* operations, so we should not perform emulation the other way around.

-- 
Regards,

Laurent Pinchart
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