[v4,06/10] dmaengine: add API for getting dma controller's quirk
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Message ID 1441501964-13952-1-git-send-email-shawn.lin@rock-chips.com
State New
Headers show

Commit Message

Shawn Lin Sept. 6, 2015, 1:12 a.m. UTC
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@rock-chips.com>
---

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(+)

Patch
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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);