dmaengine: jz4780: Use dma_get_slave_channel when requesting a specific channel

When the DT requests a specific channel to use it is not necesssary
to scan through all DMA channels in the system. Just return the
requested channel using dma_get_slave_channel().

Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Cc: dmaengine@vger.kernel.org
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index e4a291c67e2a..40baaf00b971 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -726,9 +726,14 @@ static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
                                 data.channel);
                         return NULL;
                 }
-        }
 
-        return dma_request_channel(mask, jz4780_dma_filter_fn, &data);
+                jzdma->chan[data.channel].transfer_type = data.transfer_type;
+
+                return dma_get_slave_channel(
+                        &jzdma->chan[data.channel].vchan.chan);
+        } else {
+                return dma_request_channel(mask, jz4780_dma_filter_fn, &data);
+        }
 }
 
 static int jz4780_dma_probe(struct platform_device *pdev)