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

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Date:	Tue, 06 Sep 2011 23:50:54 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	"Hiremath, Vaibhav" <hvaibhav@...com>,
	"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

Em 06-09-2011 11:47, Laurent Pinchart escreveu:
> 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.

We have 300+ drivers under /drivers/media. Just a few of them need MC API.

Good sense says that we shouldn't touch on 300+ just because of half dozen drivers.

So, if a wrapper is needed, it should be done for the other side.

Mauro.
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