dmaengine: axi-dmac: move version read in probe

The 'version' of the IP core will be needed to adapt the driver to a new feature (i.e. reading some DMA parameters from registers). To do that, the version will be checked, so this is being moved out of the axi_dmac_detect_caps() function. Signed-off-by: Alexandru Ardelean <[email protected]>
analogdevicesinc · Aug 19, 2020 · 10204f1 · 10204f1
1 parent d424174
commit 10204f1
Showing 1 changed file with 5 additions and 5 deletions.
diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
@@ -838,12 +838,9 @@ static int axi_dmac_parse_chan_dt(struct device_node *of_chan,
 	return 0;
 }
 
-static int axi_dmac_detect_caps(struct axi_dmac *dmac)
+static int axi_dmac_detect_caps(struct axi_dmac *dmac, unsigned int version)
 {
 	struct axi_dmac_chan *chan = &dmac->chan;
-	unsigned int version;
-
-	version = axi_dmac_read(dmac, ADI_AXI_REG_VERSION);
 
 	axi_dmac_write(dmac, AXI_DMAC_REG_FLAGS, AXI_DMAC_FLAG_CYCLIC);
 	if (axi_dmac_read(dmac, AXI_DMAC_REG_FLAGS) == AXI_DMAC_FLAG_CYCLIC)
@@ -894,6 +891,7 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	struct dma_device *dma_dev;
 	struct axi_dmac *dmac;
 	struct resource *res;
+	unsigned int version;
 	int ret;
 
 	dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL);
@@ -962,7 +960,9 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	ret = axi_dmac_detect_caps(dmac);
+	version = axi_dmac_read(dmac, ADI_AXI_REG_VERSION);
+
+	ret = axi_dmac_detect_caps(dmac, version);
 	if (ret)
 		goto err_clk_disable;