Messages in this thread Patch in this message | | | From | Jan Kuliga <> | Subject | [PATCH v5 5/8] dmaengine: xilinx: xdma: Add error checking in xdma_channel_isr() | Date | Mon, 18 Dec 2023 12:39:40 +0100 |
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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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