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Subject[PATCH v5 5/8] dmaengine: xilinx: xdma: Add error checking in xdma_channel_isr()
Date
Check and clear the status register value before proceeding any
further in xdma_channel_isr(). It is necessary to do it since the
interrupt may occur on any error condition enabled at the start of a
transfer.

Signed-off-by: Jan Kuliga <jankul@alatek.krakow.pl>
---
drivers/dma/xilinx/xdma.c | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c
index 0c7350863873..9a1d2939a333 100644
--- a/drivers/dma/xilinx/xdma.c
+++ b/drivers/dma/xilinx/xdma.c
@@ -811,6 +811,18 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
desc = to_xdma_desc(vd);
xdev = xchan->xdev_hdl;

+ /* Clear-on-read the status register */
+ ret = regmap_read(xdev->rmap, xchan->base + XDMA_CHAN_STATUS_RC, &st);
+ if (ret)
+ goto out;
+
+ st &= XDMA_CHAN_STATUS_MASK;
+ if ((st & XDMA_CHAN_ERROR_MASK) ||
+ !(st & (CHAN_CTRL_IE_DESC_COMPLETED | CHAN_CTRL_IE_DESC_STOPPED))) {
+ xdma_err(xdev, "channel error, status register value: 0x%x", st);
+ goto out;
+ }
+
ret = regmap_read(xdev->rmap, xchan->base + XDMA_CHAN_COMPLETED_DESC,
&complete_desc_num);
if (ret)
@@ -818,14 +830,6 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)

if (desc->cyclic) {
desc->completed_desc_num = complete_desc_num;
-
- ret = regmap_read(xdev->rmap, xchan->base + XDMA_CHAN_STATUS,
- &st);
- if (ret)
- goto out;
-
- regmap_write(xdev->rmap, xchan->base + XDMA_CHAN_STATUS, st);
-
vchan_cyclic_callback(vd);
} else {
xchan->busy = false;
--
2.34.1

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