dmaengine: dw-axi-dmac: Add device_synchronize() callback

Add support for device_synchronize() callback function to sync with
dmaengine_terminate_sync().
Signed-off-by: Sia Jee Heng <jee.heng.sia@intel.com>
Tested-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Link: https://lore.kernel.org/r/20210125013255.25799-5-jee.heng.sia@intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -347,6 +347,13 @@ static void dma_chan_issue_pending(struct dma_chan *dchan)
 	spin_unlock_irqrestore(&chan->vc.lock, flags);
 }
 
+static void dw_axi_dma_synchronize(struct dma_chan *dchan)
+{
+	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
+
+	vchan_synchronize(&chan->vc);
+}
+
 static int dma_chan_alloc_chan_resources(struct dma_chan *dchan)
 {
 	struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
@@ -940,6 +947,7 @@ static int dw_probe(struct platform_device *pdev)
 	dw->dma.device_free_chan_resources = dma_chan_free_chan_resources;
 
 	dw->dma.device_prep_dma_memcpy = dma_chan_prep_dma_memcpy;
+	dw->dma.device_synchronize = dw_axi_dma_synchronize;
 
 	platform_set_drvdata(pdev, chip);