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[5/9] dma: edma: Leave linked to Null slot instead of DUMMY slot

Message ID 1375104595-16018-6-git-send-email-joelf@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Joel Fernandes July 29, 2013, 1:29 p.m. UTC 
Dummy slot has been used as a way for missed-events not to be
reported as missing. This has been particularly troublesome for cases
where we might want to temporarily pause all incoming events.

For EDMA DMAC, there is no way to do any such pausing of events as
the occurence of the "next" event is not software controlled.
Using "edma_pause" in IRQ handlers doesn't help as by then the event
in concern from the slave is already missed.

Linking a dummy slot, is seen to absorb these events which we didn't
want to miss. So we don't link to dummy, but instead leave it linked
to NULL set, allow an error condition and detect the channel that
missed it.

Signed-off-by: Joel Fernandes <joelf@ti.com>
---
 drivers/dma/edma.c |    3 ---
 1 file changed, 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index aa4989f..1eda5cc 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -159,9 +159,6 @@  static void edma_execute(struct edma_chan *echan)
 		/* Link to the previous slot if not the last set */
 		if (i != (total_process - 1))
 			edma_link(echan->slot[i], echan->slot[i+1]);
-		/* Final pset links to the dummy pset */
-		else
-			edma_link(echan->slot[i], echan->ecc->dummy_slot);
 	}
 
 	edesc->total_processed += total_process;