From 860dd64c4382709a276eb4b7ef36596579dba04a Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Tue, 20 Oct 2015 11:46:30 +0200 Subject: [PATCH] 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 Signed-off-by: Vinod Koul --- drivers/dma/dma-axi-dmac.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c index 5b2395e7e04d..c3468094393e 100644 --- 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);