linux-kernel - [PATCH 07/10] dma: imx-sdma: Add synchronization support

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Message-ID: <1463456936-10634-8-git-send-email-jiada_wang@mentor.com>
Date:	Tue, 17 May 2016 12:48:53 +0900
From:	Jiada Wang <jiada_wang@...tor.com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>
CC:	<dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<shawnguo@...nel.org>, <kernel@...gutronix.de>,
	<george_davis@...tor.com>, <jiada_wang@...tor.com>
Subject: [PATCH 07/10] dma: imx-sdma: Add synchronization support

Implement the new device_synchronize() callback to allow proper
synchronization when stopping a channel. Since the driver already makes
sure that no new complete callbacks are scheduled after the
device_terminate_all() has been called, all left to do in the
device_synchronize() callback is to wait for all currently running complete
callbacks to finish.

Signed-off-by: Jiada Wang <jiada_wang@...tor.com>
---
 drivers/dma/imx-sdma.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 040cbf2..0b23407 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1408,6 +1408,13 @@ static int sdma_terminate_all(struct dma_chan *chan)
 	return 0;
 }
 
+static void sdma_synchronize(struct dma_chan *chan)
+{
+	struct sdma_channel *sdmac = to_sdma_chan(chan);
+
+	tasklet_kill(&sdmac->tasklet);
+}
+
 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1	34
 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2	38
 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3	41
@@ -1827,6 +1834,7 @@ static int sdma_probe(struct platform_device *pdev)
 	sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 	sdma->dma_device.device_issue_pending = sdma_issue_pending;
 	sdma->dma_device.device_terminate_all = sdma_terminate_all;
+	sdma->dma_device.device_synchronize = sdma_synchronize;
 	sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
 	dma_set_max_seg_size(sdma->dma_device.dev, 65535);
 
-- 
2.4.5