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dmaengine: Support different source and destination stride 

In interleaved mode, we can expect to have different source and destination
strides.

Add support for such case to dmaengine.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Maxime Ripard 2015-05-07 17:38:07 +02:00 committed by Vinod Koul
parent 5ebe6afaf0
commit e1031dc1f7
1 changed files with 8 additions and 0 deletions
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8
include/linux/dmaengine.h
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@ -122,10 +122,18 @@ enum dma_transfer_direction {
* chunk and before first src/dst address for next chunk. * chunk and before first src/dst address for next chunk.
* Ignored for dst(assumed 0), if dst_inc is true and dst_sgl is false. * Ignored for dst(assumed 0), if dst_inc is true and dst_sgl is false.
* Ignored for src(assumed 0), if src_inc is true and src_sgl is false. * Ignored for src(assumed 0), if src_inc is true and src_sgl is false.
* @dst_icg: Number of bytes to jump after last dst address of this
* chunk and before the first dst address for next chunk.
* Ignored if dst_inc is true and dst_sgl is false.
* @src_icg: Number of bytes to jump after last src address of this
* chunk and before the first src address for next chunk.
* Ignored if src_inc is true and src_sgl is false.
*/ */
struct data_chunk { struct data_chunk {
size_t size; size_t size;
size_t icg; size_t icg;
size_t dst_icg;
size_t src_icg;
}; };
/** /**