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Subject[PATCH v5 1/7] dmaengine: xilinx_dma: commonize DMA copy size calculation
Date
This patch removes a bit of duplicated code by introducing a new
function that implements calculations for DMA copy size.

Suggested-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
---
Changes in v4:
- introduce this patch in the patch series
Changes in v5:
None
---
drivers/dma/xilinx/xilinx_dma.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 27b523530c4a..a3aaa0e34cc7 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -952,6 +952,19 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
return 0;
}

+/**
+ * xilinx_dma_calc_copysize - Calculate the amount of data to copy
+ * @size: Total data that needs to be copied
+ * @done: Amount of data that has been already copied
+ *
+ * Return: Amount of data that has to be copied
+ */
+static int xilinx_dma_calc_copysize(int size, int done)
+{
+ return min_t(size_t, size - done,
+ XILINX_DMA_MAX_TRANS_LEN);
+}
+
/**
* xilinx_dma_tx_status - Get DMA transaction status
* @dchan: DMA channel
@@ -1791,8 +1804,8 @@ static struct dma_async_tx_descriptor *xilinx_dma_prep_slave_sg(
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
- copy = min_t(size_t, sg_dma_len(sg) - sg_used,
- XILINX_DMA_MAX_TRANS_LEN);
+ copy = xilinx_dma_calc_copysize(sg_dma_len(sg),
+ sg_used);
hw = &segment->hw;

/* Fill in the descriptor */
@@ -1896,8 +1909,7 @@ static struct dma_async_tx_descriptor *xilinx_dma_prep_dma_cyclic(
* Calculate the maximum number of bytes to transfer,
* making sure it is less than the hw limit
*/
- copy = min_t(size_t, period_len - sg_used,
- XILINX_DMA_MAX_TRANS_LEN);
+ copy = xilinx_dma_calc_copysize(period_len, sg_used);
hw = &segment->hw;
xilinx_axidma_buf(chan, hw, buf_addr, sg_used,
period_len * i);
--
2.17.1
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