linux-kernel - dmaengine: DMA_CTRL_ACK flag signification

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Date:	Wed, 24 Sep 2008 13:59:16 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	maciej.sosnowski@...el.com,
	Linux Kernel list <linux-kernel@...r.kernel.org>
CC:	dan.j.williams@...el.com,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: dmaengine: DMA_CTRL_ACK flag signification

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

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