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From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <mchehab@kernel.org>, <hugues.fruchet@st.com>,
	<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
Cc: <vkoul@kernel.org>, <linux-media@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel()
Date: Tue, 17 Dec 2019 12:41:35 +0200	[thread overview]
Message-ID: <20191217104135.23554-1-peter.ujfalusi@ti.com> (raw)

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@ti.com>
---
 drivers/media/platform/stm32/stm32-dcmi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 9392e3409fba..55351872b0c7 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -1910,10 +1910,10 @@ static int dcmi_probe(struct platform_device *pdev)
 		return PTR_ERR(mclk);
 	}
 
-	chan = dma_request_slave_channel(&pdev->dev, "tx");
-	if (!chan) {
+	chan = dma_request_chan(&pdev->dev, "tx");
+	if (IS_ERR(chan)) {
 		dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
-		return -EPROBE_DEFER;
+		return PTR_ERR(chan);
 	}
 
 	spin_lock_init(&dcmi->irqlock);
-- 
Peter

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


WARNING: multiple messages have this Message-ID (diff)
From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <mchehab@kernel.org>, <hugues.fruchet@st.com>,
	<mcoquelin.stm32@gmail.com>, <alexandre.torgue@st.com>
Cc: vkoul@kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-media@vger.kernel.org
Subject: [PATCH] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel()
Date: Tue, 17 Dec 2019 12:41:35 +0200	[thread overview]
Message-ID: <20191217104135.23554-1-peter.ujfalusi@ti.com> (raw)

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@ti.com>
---
 drivers/media/platform/stm32/stm32-dcmi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index 9392e3409fba..55351872b0c7 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -1910,10 +1910,10 @@ static int dcmi_probe(struct platform_device *pdev)
 		return PTR_ERR(mclk);
 	}
 
-	chan = dma_request_slave_channel(&pdev->dev, "tx");
-	if (!chan) {
+	chan = dma_request_chan(&pdev->dev, "tx");
+	if (IS_ERR(chan)) {
 		dev_info(&pdev->dev, "Unable to request DMA channel, defer probing\n");
-		return -EPROBE_DEFER;
+		return PTR_ERR(chan);
 	}
 
 	spin_lock_init(&dcmi->irqlock);
-- 
Peter

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


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             reply	other threads:[~2019-12-17 10:41 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-17 10:41 Peter Ujfalusi [this message]
2019-12-17 10:41 ` [PATCH] media: stm32-dcmi: Use dma_request_chan() instead dma_request_slave_channel() Peter Ujfalusi
2019-12-18 10:52 ` Hugues FRUCHET
2019-12-18 10:52   ` Hugues FRUCHET
2020-01-07  9:46   ` Hugues FRUCHET
2020-01-07  9:46     ` Hugues FRUCHET
2020-01-07 10:38     ` Peter Ujfalusi
2020-01-07 10:38       ` Peter Ujfalusi
2020-01-07 11:08       ` Hugues FRUCHET
2020-01-07 11:08         ` Hugues FRUCHET

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