linux-kernel - [PATCH v2] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 7 Jan 2020 13:52:53 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <mchehab@...nel.org>, <hugues.fruchet@...com>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <vkoul@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel()

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
Hi,

Changes since v1:
- Do not print error for EPROBE_DEFER

Regards,
Peter

 drivers/media/platform/stm32/stm32-dcmi.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 9392e3409fba..b63ff8d636ce 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -1910,10 +1910,13 @@ static int dcmi_probe(struct platform_device *pdev)
 		return PTR_ERR(mclk);
 	}
 
-	chan = dma_request_slave_channel(&pdev->dev, "tx");
-	if (!chan) {
-		dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
-		return -EPROBE_DEFER;
+	chan = dma_request_chan(&pdev->dev, "tx");
+	if (IS_ERR(chan)) {
+		ret = PTR_ERR(chan);
+		if (ret != -EPROBE_DEFER)
+			dev_err(&pdev->dev,
+				"Failed to request DMA channel: %d\n", ret);
+		return ret;
 	}
 
 	spin_lock_init(&dcmi->irqlock);
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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