From: Vignesh R <vigneshr@ti.com>
To: Vinod Koul <vinod.koul@intel.com>
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
Vignesh R <vigneshr@ti.com>,
Peter Ujfalusi <peter.ujfalusi@ti.com>,
linux-omap@vger.kernel.org, Sekhar Nori <nsekhar@ti.com>
Subject: [PATCH] dmaengine: edma: re-initialize dummy slot during system resume
Date: Wed, 23 Nov 2016 14:57:55 +0530 [thread overview]
Message-ID: <20161123092755.8522-1-vigneshr@ti.com> (raw)
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@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.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
next reply other threads:[~2016-11-23 9:27 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 9:27 Vignesh R [this message]
2016-11-30 3:25 ` [PATCH] dmaengine: edma: re-initialize dummy slot during system resume Vinod Koul
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