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From: Nicolas Ferre <nicolas.ferre@atmel.com>
To: maciej.sosnowski@intel.com,
	Linux Kernel list <linux-kernel@vger.kernel.org>
Cc: dan.j.williams@intel.com, Haavard Skinnemoen <hskinnemoen@atmel.com>
Subject: dmaengine: DMA_CTRL_ACK flag signification
Date: Wed, 24 Sep 2008 13:59:16 +0200	[thread overview]
Message-ID: <48DA2B94.3020804@atmel.com> (raw)

Hi all,

I am in the process of writing a driver for an on-chip Atmel DMA engine.

I am a little confused about the use of the flag DMA_CTRL_ACK : It seems 
that it is set in most of the descriptors in use except the first or 
last of a descriptor chain. So, I cannot find where this flag is cleared.
In short, I do not see what it is used for : how must I take it into 
account in my driver (in device_prep_dma_memcpy() for instance) ?

Can you enlighten me ?

Regards,
-- 
Nicolas Ferre


             reply	other threads:[~2008-09-24 11:59 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-24 11:59 Nicolas Ferre [this message]
2008-10-07  9:09 ` dmaengine: DMA_CTRL_ACK flag signification Sosnowski, Maciej
2008-10-13 18:51   ` Dan Williams

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