From: Stefan Herbrechtsmeier <hbmeier@hni.uni-paderborn.de>
To: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>,
Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: pxa_camera + ov9655: image shifted on first capture after reset
Date: Mon, 19 Apr 2010 15:15:39 +0200 [thread overview]
Message-ID: <4BCC577B.1090905@hni.uni-paderborn.de> (raw)
In-Reply-To: <4BC836FD.8010301@cam.ac.uk>
Jonathan Cameron schrieb:
> On 04/16/10 09:25, Stefan Herbrechtsmeier wrote:
>
>> Hi,
>>
>> I have updated my ov9655 driver to kernel 2.6.33 and
>> did some test regarding the image shift problem on pxa.
>> (http://thread.gmane.org/gmane.linux.drivers.video-input-infrastructure/10773/focus=11810)
>>
>>
>> - The image was shifted 32 pixels (64 bytes) to the right
>> or rather the first 32 pixels belongs to the previous image.
>> - The image was only shifted on the first capture after reset.
>> It doesn't matter whether I previous change the resolution with v4l2-ctl.
>> - On big images (1280 x 1024) the shift disappears after some images,
>> but not on small images (320 x 240).
>>
>> It looks like the FIFO was not cleared at start capture
> Sounds reasonable. Similar problem seen with ov7670 attached to pxa271.
> I've never taken the time to try and track it down.
>
I have fix the bug by moving the reset FIFO from
pxa_camera_start_capture to pxa_camera_irq
in front of the DMA activation after an end of frame interrupt.
I will send a patch tomorrow.
Regards,
Stefan
prev parent reply other threads:[~2010-04-19 13:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-16 8:25 pxa_camera + ov9655: image shifted on first capture after reset Stefan Herbrechtsmeier
2010-04-16 10:07 ` Jonathan Cameron
2010-04-19 13:15 ` Stefan Herbrechtsmeier [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4BCC577B.1090905@hni.uni-paderborn.de \
--to=hbmeier@hni.uni-paderborn.de \
--cc=g.liakhovetski@gmx.de \
--cc=jic23@cam.ac.uk \
--cc=linux-media@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox