dmaengine: xilinx: xdma: Fix the count of elapsed periods in cyclic mode

Xilinx DMA engine is capable of keeping track of the number of elapsed
periods and this is an increasing 32-bit counter which is only reset
when turning off the engine. No need to add this value to our local
counter.

Fixes: cd8c732 ("dmaengine: xilinx: xdma: Support cyclic transfers")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20231130111315.729430-2-miquel.raynal@bootlin.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: miquelraynal

drivers/dma/xilinx/xdma.c

@@ -754,9 +754,9 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
 	if (ret)
 		goto out;
 
-	desc->completed_desc_num += complete_desc_num;
-
 	if (desc->cyclic) {
+		desc->completed_desc_num = complete_desc_num;
+
 		ret = regmap_read(xdev->rmap, xchan->base + XDMA_CHAN_STATUS,
 				  &st);
 		if (ret)
@@ -768,6 +768,8 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
 		goto out;
 	}
 
+	desc->completed_desc_num += complete_desc_num;
+
 	/*
 	 * if all data blocks are transferred, remove and complete the request
 	 */