linux-kernel - Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM

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Date:	Tue, 27 Sep 2011 19:31:32 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	"Hiremath, Vaibhav" <hvaibhav@...com>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"Ravi, Deepthy" <deepthy.ravi@...com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"g.liakhovetski@....de" <g.liakhovetski@....de>
Subject: Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM_STD ioctl

Em 19-09-2011 12:31, Hiremath, Vaibhav escreveu:
> 
>> -----Original Message-----
>> From: Laurent Pinchart [mailto:laurent.pinchart@...asonboard.com]
>> Sent: Friday, September 16, 2011 6:36 PM
>> To: Ravi, Deepthy
>> Cc: linux-media@...r.kernel.org; tony@...mide.com; linux@....linux.org.uk;
>> linux-omap@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
>> kernel@...r.kernel.org; mchehab@...radead.org; g.liakhovetski@....de;
>> Hiremath, Vaibhav
>> Subject: Re: [PATCH 4/8] ispvideo: Add support for G/S/ENUM_STD ioctl
>>
>> Hi Deepthy,
>>
>> On Friday 16 September 2011 15:00:53 Ravi, Deepthy wrote:
>>> On Thursday, September 08, 2011 10:51 PM Laurent Pinchart wrote:
>>>> On Thursday 08 September 2011 15:35:22 Deepthy Ravi wrote:
>>>>> From: Vaibhav Hiremath <hvaibhav@...com>
>>>>>
>>>>> In order to support TVP5146 (for that matter any video decoder),
>>>>> it is important to support G/S/ENUM_STD ioctl on /dev/videoX
>>>>> device node.
>>>>
>>>> Why so ? Shouldn't it be queried on the subdev output pad directly ?
>>>
>>> Because standard v4l2 application for analog devices will call these std
>>> ioctls on the streaming device node. So it's done on /dev/video to make
>> the
>>> existing apllication work.
>>
>> Existing applications can't work with the OMAP3 ISP (and similar complex
>> embedded devices) without userspace support anyway, either in the form of
>> a
>> GStreamer element or a libv4l plugin. I still believe that analog video
>> standard operations should be added to the subdev pad operations and
>> exposed
>> through subdev device nodes, exactly as done with formats.
>>
> [Hiremath, Vaibhav] Laurent,
> 
> I completely agree with your point that, existing application will not work without setting links properly.
> But I believe the assumption here is, media-controller should set the links (along with pad formants) and 
> all existing application should work as is. Isn't it?

Yes.

> The way it is being done currently is, set the format at the pad level which is same as analog standard resolution and use existing application for streaming...

Yes.

> I am ok, if we add s/g/enum_std api support at sub-dev level but this should also be supported on streaming device node.

Agreed. Standards selection should be done at device node, just like any other
device.

Regards,
Mauro
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