linux-kernel - [PATCH] dmaengine: edma: re-initialize dummy slot during system resume

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Date:   Wed, 23 Nov 2016 14:57:55 +0530
From:   Vignesh R <vigneshr@...com>
To:     Vinod Koul <vinod.koul@...el.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Vignesh R <vigneshr@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        <linux-omap@...r.kernel.org>, Sekhar Nori <nsekhar@...com>
Subject: [PATCH] dmaengine: edma: re-initialize dummy slot during system resume

The last param set in a transfer should always be pointing to dummy
param set in non-cyclic mode. When system wakes from low power state
EDMA PARAM slots may be reset to random values. Hence, re-initialize
dummy slot to dummy param set on system resume.

Signed-off-by: Vignesh R <vigneshr@...com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/edma.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c
index 77242b37ef87..3879f80a4815 100644
--- a/drivers/dma/edma.c
+++ b/drivers/dma/edma.c
@@ -2451,6 +2451,9 @@ static int edma_pm_resume(struct device *dev)
 	int i;
 	s8 (*queue_priority_mapping)[2];
 
+	/* re initialize dummy slot to dummy param set */
+	edma_write_slot(ecc, ecc->dummy_slot, &dummy_paramset);
+
 	queue_priority_mapping = ecc->info->queue_priority_mapping;
 
 	/* Event queue priority mapping */
-- 
2.10.2