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Commit 9eeacd3a authored by Robert Jarzmik's avatar Robert Jarzmik Committed by Vinod Koul
Browse files

dmaengine: enable DMA_CTRL_REUSE 



In the current state, the capability of transfer reuse can neither be
set by a slave dmaengine driver, nor used by a client driver, because
the capability is not available to dma_get_slave_caps().

Fix this by adding a way to declare the capability.

Fixes: 27242021 ("dmaengine: Add DMA_CTRL_REUSE")
Signed-off-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 13bb26ae

drivers/dma/dmaengine.c

+1 −0
Original line number Diff line number Diff line
@@ -493,6 +493,7 @@ int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) 
	caps->dst_addr_widths = device->dst_addr_widths;

	caps->directions = device->directions;

	caps->residue_granularity = device->residue_granularity;

	caps->descriptor_reuse = device->descriptor_reuse;



	/*

	 * Some devices implement only pause (e.g. to get residuum) but no

include/linux/dmaengine.h

+2 −0
Original line number Diff line number Diff line
@@ -659,6 +659,7 @@ enum dmaengine_alignment { 
 *	struct with auxiliary transfer status information, otherwise the call

 *	will just return a simple status code

 * @device_issue_pending: push pending transactions to hardware

 * @descriptor_reuse: a submitted transfer can be resubmitted after completion

 */

struct dma_device {
@@ -681,6 +682,7 @@ struct dma_device { 
	u32 src_addr_widths;

	u32 dst_addr_widths;

	u32 directions;

	bool descriptor_reuse;

	enum dma_residue_granularity residue_granularity;



	int (*device_alloc_chan_resources)(struct dma_chan *chan);