dmaengine: axi_dmac: 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() callback 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: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 5b2395e7e04d804d338bf20379dc47d5d208a948..c3468094393ebe4f74d6bf9d8f482f169ac7b6cf 100644 (file)
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -307,6 +307,13 @@ static int axi_dmac_terminate_all(struct dma_chan *c)
        return 0;
 }
 
+static void axi_dmac_synchronize(struct dma_chan *c)
+{
+       struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
+
+       vchan_synchronize(&chan->vchan);
+}
+
 static void axi_dmac_issue_pending(struct dma_chan *c)
 {
        struct axi_dmac_chan *chan = to_axi_dmac_chan(c);
@@ -613,6 +620,7 @@ static int axi_dmac_probe(struct platform_device *pdev)
        dma_dev->device_prep_dma_cyclic = axi_dmac_prep_dma_cyclic;
        dma_dev->device_prep_interleaved_dma = axi_dmac_prep_interleaved;
        dma_dev->device_terminate_all = axi_dmac_terminate_all;
+       dma_dev->device_synchronize = axi_dmac_synchronize;
        dma_dev->dev = &pdev->dev;
        dma_dev->chancnt = 1;
        dma_dev->src_addr_widths = BIT(dmac->chan.src_width);