linux-kernel - [PATCH 3/4] dma: imx-dma: start transfer in issue

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Message-Id: <1326101570-3716-4-git-send-email-s.hauer@pengutronix.de>
Date:	Mon,  9 Jan 2012 10:32:49 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Javier Martin <javier.martin@...ta-silicon.com>,
	linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Chris Ball <cjb@...top.org>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 3/4] dma: imx-dma: start transfer in issue_pending

The DMA API requires that transfers are started in issue_pending
instead of tx_submit. Fix this.

Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/dma/imx-dma.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 4be55f9..217207b 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -186,8 +186,6 @@ static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx)
 
 	cookie = imxdma_assign_cookie(imxdmac);
 
-	imx_dma_enable(imxdmac->imxdma_channel);
-
 	spin_unlock_irq(&imxdmac->lock);
 
 	return cookie;
@@ -332,9 +330,10 @@ static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
 
 static void imxdma_issue_pending(struct dma_chan *chan)
 {
-	/*
-	 * Nothing to do. We only have a single descriptor
-	 */
+	struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
+
+	if (imxdmac->status == DMA_IN_PROGRESS)
+		imx_dma_enable(imxdmac->imxdma_channel);
 }
 
 static int __init imxdma_probe(struct platform_device *pdev)
-- 
1.7.7.3

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