[PATCH 4/8] dmaengine: dw-edma: Pass dma_slave_config to dw_edma_device_transfer()

[Frank Li]

Pass dma_slave_config to dw_edma_device_transfer() to support atomic
configuration and descriptor preparation when a non-NULL config is
provided to device_prep_slave_sg_config().

Signed-off-by: Frank Li <Frank.Li at nxp.com>
---
 drivers/dma/dw-edma/dw-edma-core.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 58f98542f8329a3bfdc5455768e8394ae601ab5f..744c60ec964102287bd32b9e55d0f3024d1d39d9 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -230,6 +230,15 @@ static int dw_edma_device_config(struct dma_chan *dchan,
 	return 0;
 }
 
+static struct dma_slave_config *
+dw_edma_device_get_config(struct dma_chan *dchan,
+			  struct dma_slave_config *config)
+{
+	struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
+
+	return config ? config : &chan->config;
+}
+
 static int dw_edma_device_pause(struct dma_chan *dchan)
 {
 	struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
@@ -348,7 +357,8 @@ dw_edma_device_tx_status(struct dma_chan *dchan, dma_cookie_t cookie,
 }
 
 static struct dma_async_tx_descriptor *
-dw_edma_device_transfer(struct dw_edma_transfer *xfer)
+dw_edma_device_transfer(struct dw_edma_transfer *xfer,
+			struct dma_slave_config *config)
 {
 	struct dw_edma_chan *chan = dchan2dw_edma_chan(xfer->dchan);
 	enum dma_transfer_direction dir = xfer->direction;
@@ -427,8 +437,8 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
 		src_addr = xfer->xfer.il->src_start;
 		dst_addr = xfer->xfer.il->dst_start;
 	} else {
-		src_addr = chan->config.src_addr;
-		dst_addr = chan->config.dst_addr;
+		src_addr = config->src_addr;
+		dst_addr = config->dst_addr;
 	}
 
 	if (dir == DMA_DEV_TO_MEM)
@@ -552,7 +562,7 @@ dw_edma_device_prep_slave_sg_config(struct dma_chan *dchan,
 	if (config)
 		dw_edma_device_config(dchan, config);
 
-	return dw_edma_device_transfer(&xfer);
+	return dw_edma_device_transfer(&xfer, dw_edma_device_get_config(dchan, config));
 }
 
 static struct dma_async_tx_descriptor *
@@ -571,7 +581,7 @@ dw_edma_device_prep_dma_cyclic(struct dma_chan *dchan, dma_addr_t paddr,
 	xfer.flags = flags;
 	xfer.type = EDMA_XFER_CYCLIC;
 
-	return dw_edma_device_transfer(&xfer);
+	return dw_edma_device_transfer(&xfer, dw_edma_device_get_config(dchan, NULL));
 }
 
 static struct dma_async_tx_descriptor *
@@ -587,7 +597,7 @@ dw_edma_device_prep_interleaved_dma(struct dma_chan *dchan,
 	xfer.flags = flags;
 	xfer.type = EDMA_XFER_INTERLEAVED;
 
-	return dw_edma_device_transfer(&xfer);
+	return dw_edma_device_transfer(&xfer, dw_edma_device_get_config(dchan, NULL));
 }
 
 static void dw_hdma_set_callback_result(struct virt_dma_desc *vd,

-- 
2.34.1