Messages in this thread Patch in this message | | | From | John Ogness <> | Subject | [PATCH 1/3] ARM: common: edma: clear completion interrupts on stop | Date | Mon, 27 Apr 2015 13:52:15 +0200 |
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When stopping a DMA transfer with interrupts disabled it is possible that the DMA transfer completes before the events are cleared. In this case the completion interrupt will be pending, causing a completion callback after the transfer was stopped.
By clearing the completion interrupt for the stopping channel it is ensured that no completion event will be generated after the stop.
Signed-off-by: John Ogness <john.ogness@linutronix.de> --- arch/arm/common/edma.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 5662a87..873dbfc 100644 --- a/arch/arm/common/edma.c +++ b/arch/arm/common/edma.c @@ -1350,6 +1350,9 @@ void edma_stop(unsigned channel) edma_shadow0_write_array(ctlr, SH_SECR, j, mask); edma_write_array(ctlr, EDMA_EMCR, j, mask); + /* clear possibly pending completion interrupt */ + edma_shadow0_write_array(ctlr, SH_ICR, j, mask); + pr_debug("EDMA: EER%d %08x\n", j, edma_shadow0_read_array(ctlr, SH_EER, j)); -- 1.7.10.4
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