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From: Marko Ristola <marko.ristola@kolumbus.fi>
To: Steven Toth <stoth@kernellabs.com>
Cc: Manu Abraham <abraham.manu@gmail.com>,
	Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: buffer management
Date: Wed, 23 Jun 2010 19:09:05 +0300	[thread overview]
Message-ID: <4C2231A1.9020104@kolumbus.fi> (raw)
In-Reply-To: <4C220165.50809@kernellabs.com>

23.06.2010 15:43, Steven Toth kirjoitti:
>> Now, on each video interrupt, I know which SG list i need to read
>> from. At this stage i do need to copy the
>> buffers associated with each of the SG lists at once. In this
>> scenario, I don't see how videobuf could be used,
>> while I keep getting this feeling that a simple copy_to_user of the
>> entire buffer could do the whole job in a
>> better way, since the buffers themselves are already managed and
>> initialized already. Am I correct in thinking
>> so, or is it that I am overlooking something ?

How to activate DMA transfers only if there is empty space for the DMA 
transfer?

Regards,
Marko

>
> Manu,
>
> SAA7164 suffers from this. If you find a solution I'd love to hear it.
>
> Regards,
>
> - Steve
>


  reply	other threads:[~2010-06-23 16:09 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-22 17:02 buffer management Manu Abraham
2010-06-23 12:43 ` Steven Toth
2010-06-23 16:09   ` Marko Ristola [this message]
2010-06-30 18:42   ` Marko Ristola

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