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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>
This commit is contained in:
Lars-Peter Clausen 2015-10-20 11:46:30 +02:00 committed by Vinod Koul
parent 2ed086296e
commit 860dd64c43
1 changed files with 8 additions and 0 deletions
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8
drivers/dma/dma-axi-dmac.c
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@ -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);