[PATCH v4 06/10] dmaengine: add API for getting dma controller's quirk

From: Shawn Lin
Date: Sat Sep 05 2015 - 21:14:48 EST

Add dmaengine_get_quirks API for peripheral devices to query
quirks if they need it to make special workaround due to broken
dma controller design.

Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>

Changes in v4: None
Changes in v3: None
Changes in v2: None
Changes in v1: None

include/linux/dmaengine.h | 9 +++++++++
1 file changed, 9 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index e2f5eb4..5174ca4 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -704,6 +704,7 @@ struct dma_device {

int (*device_config)(struct dma_chan *chan,
struct dma_slave_config *config);
+ int (*device_get_quirks)(struct dma_chan *chan);
int (*device_pause)(struct dma_chan *chan);
int (*device_resume)(struct dma_chan *chan);
int (*device_terminate_all)(struct dma_chan *chan);
@@ -723,6 +724,14 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
return -ENOSYS;

+static inline int dmaengine_get_quirks(struct dma_chan *chan)
+ if (chan->device->device_get_quirks)
+ return chan->device->device_get_quirks(chan);
+ return -ENOSYS;
static inline bool is_slave_direction(enum dma_transfer_direction direction)
return (direction == DMA_MEM_TO_DEV) || (direction == DMA_DEV_TO_MEM);

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