[PATCH v3 3/3] dmaengine: xilinx_dma: Optimize control register write and channel start logic for AXIDMA and MCDMA in corresponding start_transfer()

[Suraj Gupta]

Optimize AXI DMA control register programming by consolidating
coalesce count and delay configuration into a single register write.
Previously, the coalesce count was written separately from the delay
configuration, resulting in two register writes. Combine these into
one write operation to reduce bus overhead.
Additionally, avoid redundant channel starts in xilinx_dma_start_transfer()
and xilinx_mcdma_start_transfer() by only calling xilinx_dma_start() when
the channel is actually idle.

Tested-by: Folker Schwesinger <dev@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Suraj Gupta <suraj.gupta2@xxxxxxx>
Co-developed-by: Srinivas Neeli <srinivas.neeli@xxxxxxx>
Signed-off-by: Srinivas Neeli <srinivas.neeli@xxxxxxx>
---
 drivers/dma/xilinx/xilinx_dma.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 6e7b183cb499..829601d8a16f 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -1603,7 +1603,6 @@ static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
 		reg &= ~XILINX_DMA_CR_COALESCE_MAX;
 		reg |= chan->desc_pendingcount <<
 				  XILINX_DMA_CR_COALESCE_SHIFT;
-		dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
 	}
 
 	if (chan->has_sg && list_empty(&chan->active_list))
@@ -1614,7 +1613,8 @@ static void xilinx_dma_start_transfer(struct xilinx_dma_chan *chan)
 	reg |= XILINX_DMA_DMAXR_ALL_IRQ_MASK;
 	dma_ctrl_write(chan, XILINX_DMA_REG_DMACR, reg);
 
-	xilinx_dma_start(chan);
+	if (chan->idle)
+		xilinx_dma_start(chan);
 
 	if (chan->err)
 		return;
@@ -1703,7 +1703,8 @@ static void xilinx_mcdma_start_transfer(struct xilinx_dma_chan *chan)
 	reg |= XILINX_MCDMA_CR_RUNSTOP_MASK;
 	dma_ctrl_write(chan, XILINX_MCDMA_CHAN_CR_OFFSET(chan->tdest), reg);
 
-	xilinx_dma_start(chan);
+	if (chan->idle)
+		xilinx_dma_start(chan);
 
 	if (chan->err)
 		return;
-- 
2.25.1