dmaengine: of-dma: Add support for optional router configuration callback

Additional configuration for the DMA event router might be needed for a
channel which can not be done during device_alloc_chan_resources callback
since the router information is not yet present for the drivers.

If there is a need for additional configuration for the channel if DMA
router is in use, then the driver can implement the device_router_config
callback.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201208090440.31792-8-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 8a4f608..ec00b20 100644 (file)
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -75,8 +75,18 @@ static struct dma_chan *of_dma_router_xlate(struct of_phandle_args *dma_spec,
                ofdma->dma_router->route_free(ofdma->dma_router->dev,
                                              route_data);
        } else {
+               int ret = 0;
+
                chan->router = ofdma->dma_router;
                chan->route_data = route_data;
+
+               if (chan->device->device_router_config)
+                       ret = chan->device->device_router_config(chan);
+
+               if (ret) {
+                       dma_release_channel(chan);
+                       chan = ERR_PTR(ret);
+               }
        }
 
        /*

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 493a047..aed4488 100644 (file)
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -805,6 +805,7 @@ struct dma_filter {
  *     by tx_status
  * @device_alloc_chan_resources: allocate resources and return the
  *     number of allocated descriptors
+ * @device_router_config: optional callback for DMA router configuration
  * @device_free_chan_resources: release DMA channel's resources
  * @device_prep_dma_memcpy: prepares a memcpy operation
  * @device_prep_dma_xor: prepares a xor operation
@@ -879,6 +880,7 @@ struct dma_device {
        enum dma_residue_granularity residue_granularity;
 
        int (*device_alloc_chan_resources)(struct dma_chan *chan);
+       int (*device_router_config)(struct dma_chan *chan);
        void (*device_free_chan_resources)(struct dma_chan *chan);
 
        struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(