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dma: i.MX31 IPU DMA robustness improvements
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Add DMA error handling to the ISR, move common code fragments to functions, fix
scatter-gather element queuing in the ISR, survive channel freeing and
re-allocation in a quick succession.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Guennadi Liakhovetski authored and Dan Williams committed Mar 25, 2009
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