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| author | John Ogness <john.ogness@linutronix.de> | 2015-04-27 13:52:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-06 22:27:01 +0200 |
| commit | c2d4bb9d9387231f5e265d59600aeb6409be8e7a (patch) | |
| tree | 48b7137424eda535a60d9e528649e0c7329cdeb5 /arch/arm/common | |
| parent | 35a0f950aadcb65e43fc1cbc5790f313737d9148 (diff) | |
| download | linux-c2d4bb9d9387231f5e265d59600aeb6409be8e7a.tar.bz2 | |
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>
Diffstat (limited to 'arch/arm/common')
| -rw-r--r-- | arch/arm/common/edma.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/common/edma.c b/arch/arm/common/edma.c index 5662a872689b..873dbfcc7dc9 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)); |