linux-kernel - Re: [PATCH 2/2] V4L: mx3-camera: prepare to support multi-size buffers

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Message-Id: <201108251857.16865.laurent.pinchart@ideasonboard.com>
Date:	Thu, 25 Aug 2011 18:57:16 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Pawel Osciak <pawel@...iak.com>,
	Sakari Ailus <sakari.ailus@...well.research.nokia.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH 2/2] V4L: mx3-camera: prepare to support multi-size buffers

Hi Guennadi,

On Thursday 25 August 2011 18:46:03 Guennadi Liakhovetski wrote:
> Prepare the mx3_camera friver to support the new VIDIOC_CREATE_BUFS and
> VIDIOC_PREPARE_BUF ioctl()s. The .queue_setup() vb2 operation must be
> able to handle buffer sizes, provided by the caller, and the
> .buf_prepare() operation must not use the currently configured frame
> format for its operation, which makes it superfluous for this driver.
> Its functionality is moved into .buf_queue().

You're moving the ichan->dma_chan.device->device_prep_slave_sg() call from 
.buf_prepare() to .buf_queue(). Is that call cheap ? Otherwise it would be 
better to keep the .buf_prepare() callback.

-- 
Regards,

Laurent Pinchart
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