diff options
| author | Jan Kuliga <jankul@alatek.krakow.pl> | 2023-12-18 12:39:40 +0100 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-12-22 12:19:41 +0530 |
| commit | d0f22a3f55044f91b98e5536aa2c4d51d41cf8e7 (patch) | |
| tree | d6b4b4f1717f217651b84d5ad9ebc47947264193 /drivers/dma | |
| parent | 855c2e1d1842f0101a051378094548ca581d7a7d (diff) | |
| download | linux-d0f22a3f55044f91b98e5536aa2c4d51d41cf8e7.tar.gz | |
dmaengine: xilinx: xdma: Add error checking in xdma_channel_isr()
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>
Link: https://lore.kernel.org/r/20231218113943.9099-6-jankul@alatek.krakow.pl
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/xilinx/xdma.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c index 0c73508638738..9a1d2939a333f 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; |