[v3,07/20] dmaengine: of-dma: Add support for optional router configuration callback

Message ID 20201208090440.31792-8-peter.ujfalusi@ti.com
State Accepted
Commit 4f910c035f38053ac8eb63a672c78862c535cd0f
Headers show
Series
  • dmaengine/soc: k3-udma: Add support for BCDMA and PKTDMA
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Commit Message

Peter Ujfalusi Dec. 8, 2020, 9:04 a.m.
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>

---
 drivers/dma/of-dma.c      | 10 ++++++++++
 include/linux/dmaengine.h |  2 ++
 2 files changed, 12 insertions(+)

-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Patch

diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 8a4f608904b9..ec00b20ae8e4 100644
--- 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 493a047ed0a2..aed44888cad3 100644
--- 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)(