Re: testing soc_camera with mt9m001 on pxa270

From: "Maik Steuer" <Maik.Steuer@gmx.de>
To: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: video4linux-list@redhat.com, kernel@pengutronix.de
Subject: Re: testing soc_camera with mt9m001 on pxa270
Date: Mon, 01 Dec 2008 11:35:05 +0100	[thread overview]
Message-ID: <20081201103505.79550@gmx.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0811281755510.4430@axis700.grange>

-------- Original-Nachricht --------
> Datum: Fri, 28 Nov 2008 18:00:47 +0100 (CET)
> Von: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
> An: Maik Steuer <Maik.Steuer@gmx.de>
> CC: kernel@pengutronix.de, video4linux-list@redhat.com
> Betreff: Re: testing soc_camera with mt9m001 on pxa270

> On Fri, 28 Nov 2008, Maik Steuer wrote:
> 
> > > I would suggest you tell us what camera you are going to use, maybe 
> > > someone is already working on a driver for it. If not - you write a
> driver
> > > yourself and start working with a real hardware.
> > 
> > At the moment the camera is only a FPGA which sends 8 Bit dummy data 
> > with hsync, vsync and pixclock. So I can change all necessary parameters
> > for pxa requirements.
> > 
> > I throught that the ioctl (fd, VIDIOC_REQBUFS, &req) starts 
> > soc_camera_reqbufs() but it isn't so.
> 
> Yes, this is indeed what should happen: see __video_do_ioctl() and around 
> it. You're saying, that VIDIOC_REQBUFS is the first failing ioctl? Then 

Yes, VIDIOC_REQBUFS is the first failling. The right case construction wasn't called. I printed out the commited ioctl cmd and the unsigned integer value for VIDIOC_REQBUFS:

<7>pxa27x-camera: VIDIOC_REQBUFS
<7>switch(c0105608) VIDIOC_REQBUFS = c0145608

They are different! That's the problem. The capture.c example use #include <linux/videodev2.h> but the v4l2-ioctl.c use declarations in #include <media/v4l2-ioctl.h> for the VIDIOC_REQBUF define macro. 

Is there a known version conflict?

> just check what error code it returns, activate the 
> 
> 	dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
> 
> in soc_camera.c::soc_camera_reqbufs(), etc.
> 
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski, Ph.D.
> Freelance Open-Source Software Developer

greets
Maik
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