linux-kernel - [PATCH v2 -next 7/7] dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma

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Message-Id: <1571150904-3988-8-git-send-email-radhey.shyam.pandey@xilinx.com>
Date:   Tue, 15 Oct 2019 20:18:24 +0530
From:   Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
To:     vkoul@...nel.org, dan.j.williams@...el.com,
        michal.simek@...inx.com, nick.graumann@...il.com,
        andrea.merello@...il.com, appana.durga.rao@...inx.com,
        mcgrof@...nel.org
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: [PATCH v2 -next 7/7] dmaengine: xilinx_dma: Clear desc_pendingcount in xilinx_dma_reset

From: Nicholas Graumann <nick.graumann@...il.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@...il.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
---
Changes for v2:
None
---
 drivers/dma/xilinx/xilinx_dma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index b0d3aac..56a7317 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -1486,6 +1486,7 @@ 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;
-- 
2.7.4