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ARM: common: edma: clear completion interrupts on stop 

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>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Ogness 2015-04-27 13:52:15 +02:00 committed by Greg Kroah-Hartman
parent 35a0f950aa
commit c2d4bb9d93
1 changed files with 3 additions and 0 deletions
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3
arch/arm/common/edma.c
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@ -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));