Messages in this thread | | | Date | Mon, 27 Apr 2015 14:55:26 +0300 | From | Peter Ujfalusi <> | Subject | Re: [PATCH 1/3] ARM: common: edma: clear completion interrupts on stop |
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On 04/27/2015 02:52 PM, John Ogness wrote: > 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.
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> 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)); > >
-- Péter
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