dmaengine: stm32-dma: Add synchronization support

Implement the new device_synchronize() callback to allow proper
synchronization when stopping a channel.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 8a29b02..53b2ee7 100644 (file)
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -403,6 +403,13 @@ static int stm32_dma_terminate_all(struct dma_chan *c)
        return 0;
 }
 
+static void stm32_dma_synchronize(struct dma_chan *c)
+{
+       struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
+
+       vchan_synchronize(&chan->vchan);
+}
+
 static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
 {
        struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
@@ -1066,6 +1073,7 @@ static int stm32_dma_probe(struct platform_device *pdev)
        dd->device_prep_dma_cyclic = stm32_dma_prep_dma_cyclic;
        dd->device_config = stm32_dma_slave_config;
        dd->device_terminate_all = stm32_dma_terminate_all;
+       dd->device_synchronize = stm32_dma_synchronize;
        dd->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |
                BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |
                BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);