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From: Tom <Bassai_Dai@gmx.net>
To: linux-media@vger.kernel.org
Subject: Re: OMAP3 ISP DQBUF hangs
Date: Tue, 20 Aug 2013 09:38:41 +0000 (UTC)	[thread overview]
Message-ID: <loom.20130820T113209-509@post.gmane.org> (raw)
In-Reply-To: CALxrGmWE0G91KSwUysZ+Vz4807ihc9hbPDJqbjoPE4z2YEAN_g@mail.gmail.com

Su Jiaquan <jiaquan.lnx <at> gmail.com> writes:

Hello,

> 
> Hi Tom
> 
> 
> Well, for our practice, we QBUF before STREAMON (not on omap3 isp).
> You can try that and see what happens.
> 
> As I check the omap3 code, you sequence maybe OK. Coz there is a
> restart mechanism in the code to restart CCDC hardware after buffer
> underrun. But for you sequence, if the interrupt comes before you
> QBUF, then the hardware is running in underrun state ever from the
> STREAMON. Not sure the restart mechanism works in this scenario. Let's
> wait for answers from the professional 
> 
> Jiaquan
> 

Thanks for your reply. The hang is solved. You were right. Now I do QBUF ->
STREAMON -> DQBUF -> STREAMOFF.

My new Problem is that I receive a black image, but I think I do a new post
with the appropriate subject.

Best Regrads, Tom 


      reply	other threads:[~2013-08-20  9:39 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-15 14:15 OMAP3 ISP DQBUF hangs Tom
2013-08-17 23:38 ` Su Jiaquan
2013-08-19 14:53   ` Tom
2013-08-19 15:35     ` Enrico
2013-08-20  0:50     ` Su Jiaquan
2013-08-20  9:38       ` Tom [this message]

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