linux-kernel - [PATCH 2/5] dmaengine: axi-dmac: move clock enable earlier

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Date:   Wed, 19 Aug 2020 10:16:30 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <vkoul@...nel.org>, <lars@...afoo.de>, <dan.j.williams@...el.com>,
        <ardeleanalex@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH 2/5] dmaengine: axi-dmac: move clock enable earlier

The clock may also be required to read registers from the IP core (if it is
provided and the driver needs to control it).
So, move it earlier in the probe.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/dma/dma-axi-dmac.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c
index 088c79137398..07665c60c21b 100644
--- a/drivers/dma/dma-axi-dmac.c
+++ b/drivers/dma/dma-axi-dmac.c
@@ -850,6 +850,10 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	if (IS_ERR(dmac->clk))
 		return PTR_ERR(dmac->clk);
 
+	ret = clk_prepare_enable(dmac->clk);
+	if (ret < 0)
+		return ret;
+
 	INIT_LIST_HEAD(&dmac->chan.active_descs);
 
 	of_channels = of_get_child_by_name(pdev->dev.of_node, "adi,channels");
@@ -892,10 +896,6 @@ static int axi_dmac_probe(struct platform_device *pdev)
 	dmac->chan.vchan.desc_free = axi_dmac_desc_free;
 	vchan_init(&dmac->chan.vchan, dma_dev);
 
-	ret = clk_prepare_enable(dmac->clk);
-	if (ret < 0)
-		return ret;
-
 	version = axi_dmac_read(dmac, ADI_AXI_REG_VERSION);
 
 	ret = axi_dmac_detect_caps(dmac, version);
-- 
2.17.1