When the ccerr handler is called but the error registers indicate no error
events we need to command eDMA to re-evaluate the errors. Otherwise we can
receive flood of error interrupts.
Reported-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/dma/edma.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 10f9b992b927..7c76b558cf82 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -1540,8 +1540,17 @@ static irqreturn_t dma_ccerr_handler(int irq, void *data)
dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
- if (!edma_error_pending(ecc))
+ if (!edma_error_pending(ecc)) {
+ /*
+ * The registers indicate no pending error event but the irq
+ * handler has been called.
+ * Ask eDMA to re-evaluate the error registers.
+ */
+ dev_err(ecc->dev, "%s: Error interrupt without error event!\n",
+ __func__);
+ edma_write(ecc, EDMA_EEVAL, 1);
return IRQ_NONE;
+ }
while (1) {
/* Event missed register(s) */
--
2.8.2
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