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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: 272420214d ("dmaengine: Add DMA_CTRL_REUSE")
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Robert Jarzmik 2015-10-13 21:54:29 +02:00 committed by Vinod Koul
parent 13bb26ae88
commit 9eeacd3a2f
2 changed files with 3 additions and 0 deletions
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1
drivers/dma/dmaengine.c
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@ -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

2
include/linux/dmaengine.h
View File

@ -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);