dmaengine: fsl-edma: implement .device_synchronize callback

Implement .device_synchronize callback in order to be able to use
dmaengine_terminate_sync() and other primitives relying on said
callback.
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Stefan Agner <stefan@agner.ch>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: linux-imx@nxp.com
Cc: dmaengine@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/20190731173659.14778-1-andrew.smirnov@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/fsl-edma.c

@@ -20,6 +20,13 @@
 
 #include "fsl-edma-common.h"
 
+static void fsl_edma_synchronize(struct dma_chan *chan)
+{
+	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);
+
+	vchan_synchronize(&fsl_chan->vchan);
+}
+
 static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
 {
 	struct fsl_edma_engine *fsl_edma = dev_id;
@@ -363,6 +370,7 @@ static int fsl_edma_probe(struct platform_device *pdev)
 	fsl_edma->dma_dev.device_pause = fsl_edma_pause;
 	fsl_edma->dma_dev.device_resume = fsl_edma_resume;
 	fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
+	fsl_edma->dma_dev.device_synchronize = fsl_edma_synchronize;
 	fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
 
 	fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;