[PATCH 4.4 67/99] dmaengine: ti: edma: Do not reset reserved paRAM slots

[Greg Kroah-Hartman]

From: Peter Ujfalusi <peter.ujfalusi@xxxxxx>

[ Upstream commit c5dbe60664b3660f5ac5854e21273ea2e7ff698f ]

Skip resetting paRAM slots marked as reserved as they might be used by
other cores.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
Link: https://lore.kernel.org/r/20190823125618.8133-2-peter.ujfalusi@xxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/dma/edma.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 85674a8d04368..e508c8c5f3fde 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -2218,9 +2218,6 @@ static int edma_probe(struct platform_device *pdev)
 
 	ecc->default_queue = info->default_queue;
 
-	for (i = 0; i < ecc->num_slots; i++)
-		edma_write_slot(ecc, i, &dummy_paramset);
-
 	if (info->rsv) {
 		/* Set the reserved slots in inuse list */
 		rsv_slots = info->rsv->rsv_slots;
@@ -2233,6 +2230,12 @@ static int edma_probe(struct platform_device *pdev)
 		}
 	}
 
+	for (i = 0; i < ecc->num_slots; i++) {
+		/* Reset only unused - not reserved - paRAM slots */
+		if (!test_bit(i, ecc->slot_inuse))
+			edma_write_slot(ecc, i, &dummy_paramset);
+	}
+
 	/* Clear the xbar mapped channels in unused list */
 	xbar_chans = info->xbar_chans;
 	if (xbar_chans) {
-- 
2.20.1