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dmaengine: edma: Re-evaluate errors when ccerr is triggered w/o error event 

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@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2016-05-10 13:40:54 +03:00 committed by Vinod Koul
parent 4376455727
commit 3b2bc8a732
1 changed files with 10 additions and 1 deletions
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11
drivers/dma/edma.c
View File

@ -1518,8 +1518,17 @@ 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) */