[-next,8/8] dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma_reset
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Message ID 1567701424-25658-9-git-send-email-radhey.shyam.pandey@xilinx.com
State New
Headers show
Series
  • AXI DMA driver improvements
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Commit Message

Radhey Shyam Pandey Sept. 5, 2019, 4:37 p.m. UTC
From: Nicholas Graumann <nick.graumann@gmail.com>

Whenever we reset the channel, we need to clear desc_pendingcount
along with desc_submitcount. Otherwise when a new transaction is
submitted, the irq coalesce level could be programmed to an incorrect
value in the axidma case.

This behavior can be observed when terminating pending transactions
with xilinx_dma_terminate_all() and then submitting new transactions
without releasing and requesting the channel.

Signed-off-by: Nicholas Graumann <nick.graumann@gmail.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
---
 drivers/dma/xilinx/xilinx_dma.c | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 0896e07..010baed 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -1480,6 +1480,7 @@  static int xilinx_dma_reset(struct xilinx_dma_chan *chan)
 
 	chan->err = false;
 	chan->idle = true;
+	chan->desc_pendingcount = 0;
 	chan->desc_submitcount = 0;
 
 	return err;