From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Thu, 30 Sep 2010 13:56:32 +0000 (+0000)
Subject: dmaengine: add possibility for cyclic transfers
X-Git-Tag: v2.6.37-rc1~79^2~6^4~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=782bc950d84e404422ba21008fd51ee894c8d231;p=pandora-kernel.git

dmaengine: add possibility for cyclic transfers

Cyclic transfers are useful for audio where a single buffer divided
in periods has to be transfered endlessly until stopped. After being
prepared the transfer is started using the dma_async_descriptor->tx_submit
function. dma_async_descriptor->callback is called after each period.
The transfer is stopped using the DMA_TERMINATE_ALL callback.
While being used for cyclic transfers the channel cannot be used
for other transfer types.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---

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